REVIEW 3 major objections 5 minor 155 references
The Two-infall Model Revisited: Constraints on Milky Way Bulge Assembly from >30,000 Galactic Chemical Evolution Models and Machine Learning
T0 review · 3 major / 5 minor · reviewed 2026-08-03 · deepseek-v4-flash
Pith's one-line read The Milky Way's bulge formed in two episodes: an almost instantaneous early collapse that made ~60% of its stars, then a delayed gas infall around 9 Gyr ago that made the rest.
desk verdict A well-executed, honest parameter search, but the claim that a second infall is 'chemically required' rests on a model contrast the paper never actually runs. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The workhorse is a one-zone galactic chemical evolution model with a time-dependent star-formation efficiency and a two-component exponential infall history. The first mode, a rapid high-efficiency collapse, builds the old alpha-enhanced population; the second mode, a delayed lower-efficiency inflow, dilutes the interstellar medium and lets Type Ia supernovae add iron, producing the metal-rich, low-alpha sequence. The parameter space—infall onset times and timescales, mass ratio between episodes, star-formation efficiencies, IMF upper mass, and supernova Ia normalization, plus categorical yield and IMF choices—is explored with a hybrid genetic algorithm refined by differential-evolution MCMC
What would settle it
Rebuild the composite MDF target using only one survey at a time, or with a different latitude weighting, and rerun the optimization: if the MAP values for t2, τ2, σ2, and ΔSFE move outside the quoted 68% highest-density intervals, the inferred two-infall history is an artifact of target construction.
Extended reading notes
Core claim
The paper's central claim is that the Milky Way bulge's chemical patterns—a bimodal metallicity distribution with peaks near [Fe/H] ≈ −0.3 and +0.3, and an alpha-to-iron decline at high metallicity—are reproduced only when gas falls into the bulge in two episodes governed by a two-exponential infall law. The maximum-a-posteriori solution places the first infall at t1 ≈ 0.1 Gyr with timescale τ1 ≈ 0.09 Gyr and star-formation efficiency ≈ 2.9 Gyr⁻¹, building about 60% of the mass; the second infall begins at t2 ≈ 5.1 Gyr, lasts τ2 ≈ 1.7 Gyr, carries about 40% of the mass, and runs at roughly 28% lower efficiency. The later episode is presented not as an option but as a chemical necessity: with
Load-bearing premise
The load-bearing premise is that the hand-built composite metallicity distribution—equal-weight averaging of two surveys with different selection effects and a fitted latitude scaling—faithfully represents the bulge's true MDF; if that target is biased, every inferred infall parameter shifts.
Editorial extensions
If this is right
- If correct, the old alpha-enhanced bulge population formed within roughly the first 0.2 Gyr of cosmic history—an extreme early starburst that set the chemical baseline.
- The second infall adds a younger, roughly 40%-mass component around 8–9 Gyr ago; its reduced efficiency is what creates the metal-rich peak and the downturn in alpha/Fe.
- The bulge's age–metallicity relation implied by reproducing the MDF favors a revised, older age scale for super-solar-metallicity bulge dwarfs over the original younger ages.
- Because infall timing, mass ratio, and efficiency are strongly covariant, current MDF data constrain only combinations of parameters, not each individually; the existence of a second episode is the robust part.
- The second infall epoch overlaps both the last major merger and the era of bar formation, so bulge chemistry alone cannot yet distinguish merger-fed from bar-driven late gas supply.
Reading between the lines
- Editorial extension: the composite target MDF is an equal 50/50 blend of two surveys with different selection functions; re-running the fit under alternative weightings could shift the MAP values for t2, τ2, and ΔSFE substantially, since no sensitivity analysis is presented.
- Editorial extension: if reduced second-infall efficiency is the real cause of the low-alpha metal-rich population, spatially resolved multi-zone models should predict a correlation between alpha and vertical metallicity gradients—something the single-zone approach cannot capture.
- Editorial extension: upcoming large asteroseismic samples in the bulge could test the age-scale choice directly; if the younger ages for metal-rich bulge stars survive, the model's preferred age–metallicity relation would be overturned.
- Editorial extension: the degeneracy analysis suggests a single observable, such as the height of the super-solar MDF peak or the position of the alpha knee, may be nearly sufficient to certify a second infall; a simple test is to fit single-infall models to each [alpha/Fe] sequence and check whether any can reproduce the downturn.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper presents a two-infall galactic chemical evolution model of the Milky Way bulge, implemented in an extension of OMEGA+ ("OMEGA++"), and constrains its parameters by fitting a composite MDF assembled from APOGEE DR16 and BDBS data. The optimization uses a hybrid genetic algorithm with DEMC refinement over a 15-dimensional space (10 continuous, 5 categorical), and the resulting weighted ensemble is treated as a pseudo-posterior. The headline results are an early rapid first infall (t1≈0.1 Gyr, τ1≈0.09 Gyr, SFE≈2.9 Gyr−1) that forms ~60% of the bulge mass, followed by a delayed second infall (t2≈5.1 Gyr, τ2≈1.7 Gyr, σ2≈0.69) with reduced SFE, which the authors claim is chemically required to reproduce the metal-rich MDF peak and low-[α/Fe] population. The model's AMR is then compared to observations, favoring the Joyce et al. (2023) age scale over Bensby et al. (2017). Independent MCMC runs for each categorical combination (Appendix A) are used to validate the GA sampler. The manuscript is honest about its pseudo-posterior nature and lists several modeling limitations, but it does not perform a nested single-infall comparison and the composite MDF target is constructed without sensitivity analysis.
Significance. If the central claims hold, the paper would provide a quantitative, observationally constrained picture of bulge assembly with an early rapid collapse and a delayed, sub-dominant second gas infall—relevant to classical versus secular bulge formation debates. The work's main strengths are the unusually wide parameter search, the explicit cross-validation of the GA+DEMC sampler against 288 independent MCMC runs (Appendix A), the transparent treatment of degeneracies via PCA and mutual information, and the out-of-sample use of the AMR rather than fitting it directly. However, the central qualitative claim that a second infall is 'chemically required' is not supported by a nested model test, and the quantitative MAP/HDI values rest entirely on a hand-assembled composite MDF target whose construction is not stress-tested. These issues currently limit the paper's conclusions to conditional on unexamined assumptions.
major comments (3)
- [§5.4.2 / §6] The headline claim that a non-zero second infall is 'chemically required' is not demonstrated by any nested model comparison. Table 1 samples σ2 only over 0.1–10.0, so σ2 = 0 is outside the explored prior. The statement in §5.4.2 that 'models with strictly negligible second infall fail' is unsupported by a figure, loss comparison, or likelihood-ratio test. Moreover, the time-dependent ΔSFE parameter can produce late-time SN Ia enrichment and a declining [α/Fe] track even with zero second infall gas (A2=0 in Eq. 2). Thus the data may require two star-formation phases, but not necessarily two gas infalls. Please add a single-infall (or σ2→0) control model and compare its best ensemble loss and MDF/AMR residuals; if such a model cannot fit, show that explicitly. Otherwise, soften the claim to 'two enrichment phases' rather than 'two infalls.'
- [§2, Eq. (1)] The composite MDF target is the only optimization target, yet its construction is not tested for robustness. The latitude scaling N/N0 = 1.029 e^{0.476 b} is fitted to Zoccali et al. (2018) and applied to APOGEE latitude fits, then combined 50/50 by equal weight with the BDBS red-clump MDF. The paper itself notes that BDBS appears less bimodal than APOGEE, so the equal-weight choice is substantive. The MAP/HDI values in Table 2 (σ2≈0.69, t2≈5.15 Gyr, ΔSFE≈0.72) are all derived from this specific target. Please provide a sensitivity analysis: re-run the optimization (or re-weight the existing model ensemble) under alternative weightings (e.g., 30/70, 70/30) or with the BDBS-only and APOGEE-only targets. If t2, σ2, and ΔSFE are stable, report this; if they shift, quantify the shift and adjust the conclusions accordingly.
- [§3.5 / §4] The pseudo-posterior weights are computed from an uncalibrated ensemble loss L_ensemble = 0.7 L_WRMSE + 0.2 L_cosine + 0.1 L_Huber, with no noise model for the MDF bins. Consequently, the 68% HDI values in Table 2 are not calibrated posterior intervals in a statistical sense—they depend on arbitrary loss weights and bin choices. Since the paper repeatedly uses these intervals to assert constraints (e.g., 't1 is notably more constrained,' 'σ2 is not well constrained'), the absence of a noise model is load-bearing. Please either (a) formulate a likelihood (e.g., Poisson or Gaussian per bin with the published/estimated uncertainties) and re-derive the posterior, or (b) at minimum, demonstrate that the MAP/HDI conclusions are stable under sensible variations of the loss weights and binning (e.g., 0.6/0.3/0.1, 0.8/0.1/0.1, and varied bin widths). This would also make the 'cannot fit' statemen
minor comments (5)
- [Throughout] Notation is inconsistent: the onset of the second infall is called t2 in Table 1 and the text, but tmax,2 in Eq. (2). Please unify. Also, the parameter ΔSFE is written as both 'ΔSFE' and 'δ SFE' in §5.3 and §5.4.4; pick one.
- [Abstract / §5.1] The abstract states '>30,000 GCE models', but Table 5 in Appendix A reports 262,144 GA+DEMC model evaluations (and 9,437,184 MCMC evaluations). The count in the abstract appears inconsistent with the total; please clarify what the 30,000 refers to (e.g., unique posterior-weighted models after filtering).
- [References] Reference typos: 'Truemam et al. 2025' in §5.2 should be 'Trueman', and the reference list contains both 'Truemam' and 'Trueman' entries; similarly, 'Cˆot´e et al.' appears with inconsistent accents. Also, the software list includes 'ChatGPT, Gemini'—if these were used in manuscript preparation, this is acceptable, but (i) for reproducibility, specify their role (e.g., text editing vs code generation), and (ii) consider whether journal policy requires this disclosure.
- [Figure 11 caption] The caption says 'one for each unique choice of categorical model ingredients Table 1)'—a closing parenthesis is missing. Also, the HDI annotations in Figures 3 and 11 are hard to read at the plotted scale; consider enlarging or tabulating the values.
- [§5.2 / Fig. 8] The Ti panel shows a systematic underprediction, which the paper attributes to yield uncertainties. Given that Ti is a known problem, it would help to state explicitly whether the model residuals for Ti are included in any quantitative goodness-of-fit metric, or whether the fit is driven entirely by the MDF (as implied by Eq. 7).
Circularity Check
No circular reduction; the central inference is an independent parameter fit with an out-of-sample AMR by-product.
full rationale
The paper's quantitative core is a fit of a two-infall GCE model to an observational composite MDF using an explicit ensemble loss (Eq. 7). The MAP/HDI values for t1, tau1, t2, tau2, sigma2, SFE, DeltaSFE, etc. are outputs of that fit, not inputs to it. The AMR comparison is explicitly stated to be a post-optimization by-product and is not used as an optimization target, so the preference for the Joyce et al. (2023) ages is an out-of-sample model output rather than a fitted quantity. The Johnson et al. (2022) MDF and Joyce et al. (2023) AMR are externally anchored observational/age data sets even though they share authors; self-citation overlap of this kind is bias evidence, not circularity. The main scientific caveat is that the claim that a second infall is 'chemically required' is not supported by a fitted single-infall baseline: Eq. 2 imposes a two-infall form and Table 1 samples sigma2 only over 0.1-10.0, so sigma2=0 is outside the explored prior, and no nested model comparison is shown. That is a model-comparison and inference-calibration gap, not a circular reduction of the kind where a prediction equals its input by construction. The paper also transparently acknowledges that its one-zone model cannot uniquely identify the number of infall episodes. Because no derivation step reduces to its own input or to an unverified self-citation, no circularity is established.
Assumptions & free parameters
free parameters (11)
- t1 (first infall onset) =
0.098 Gyr
- tau1 (first infall timescale) =
0.093 Gyr
- t2 (second infall onset) =
5.145 Gyr (HDI 3.25–8.45)
- tau2 (second infall timescale) =
1.74 Gyr (HDI 0.5–3.7)
- sigma2 (second/first infall mass ratio) =
0.69 (HDI 0.11–3.1)
- SFE (first-phase star formation efficiency) =
2.93 Gyr^-1 (bimodal; secondary peak ~25)
- dSFE (multiplicative SFE drop at t2) =
0.72 (HDI 0.39–0.85)
- Mmax (IMF upper mass cutoff) =
108.4 Msun
- MBulge (final stellar mass normalization) =
1.01e10 Msun
- NIa/Msun (SN Ia normalization) =
5.8e-4
- Loss weight coefficients (0.7/0.2/0.1) =
0.7, 0.2, 0.1
assumptions (8)
- domain assumption Bulge is a single well-mixed gas reservoir with instantaneous mixing
- domain assumption Inflow-only evolution, no outflows
- ad hoc to paper Gas infall rate has the two-exponential form of Eq. 2
- domain assumption Infalling and initial gas is pre-enriched according to the STELLAB library
- ad hoc to paper Composite MDF target defined by Eq. 1 latitude scaling and 50/50 equal weighting of APOGEE and BDBS
- domain assumption Nucleosynthetic yield grids (LC18, Karakas, Nomoto, Shen, Gronow) and SN Ia delay-time distributions are correct
- ad hoc to paper Final-mass window 5e9 < Mfinal < 3e10 Msun used as a model filter
- domain assumption IMF family spans the true bulge IMF
Cite this review
Pith. "Pith review of The Two-infall Model Revisited: Constraints on Milky Way Bulge Assembly from >30,000 Galactic Chemical Evolution Models and Machine Learning." pith.science (2026). https://pith.science/paper/K7Q2URNZ
@misc{pith2026251208090,
author = {Pith},
title = {Pith review of: The Two-infall Model Revisited: Constraints on Milky Way Bulge Assembly from >30,000 Galactic Chemical Evolution Models and Machine Learning},
year = {2026},
howpublished = {\url{https://pith.science/paper/K7Q2URNZ}},
note = {Machine review of arXiv:2512.08090}
}
abstract
We constrain the formation history of the Milky Way bulge using a two-infall galactic chemical evolution (GCE) algorithm implemented in the N'OMEGA+ code. We recover a best-fit scenario in which the bulge forms through an early, rapid starburst ($t_1 \sim 0.1$ Gyr, $\tau_1 \sim 0.09$ Gyr, and star formation efficiency (SFE) $\sim 3~\mathrm{Gyr}^{-1}$), followed by a delayed, lower-mass second infall ($t_2 \sim 5.1$ Gyr, $\tau_2 \sim 1.7$ Gyr, and $\sigma_2 \sim 0.69$). Our model adopts mass- and metallicity-dependent nucleosynthetic yields from modern stellar grids and explores a wide GCE parameter space in infall timing, SFE, mass partitioning, initial mass function upper mass, and type Ia supernova normalization, optimized via a hybrid genetic algorithm with Markov Chain Monte Carlo refinement. The later infall features a reduced SFE ($\Delta\mathrm{SFE} \sim 0.72$), reproducing the metal-rich peak of the bulge metallicity distribution function (MDF) and the decline in [$\alpha$/Fe] at high [Fe/H]. Our model naturally favors the M. Joyce et al. age--metallicity relation over the ages in T. Bensby et al. Degeneracy and principal component analyses show that the infall history, SFE, and mass partitioning are strongly covariant---the bulge's observed MDF, abundance trends, and age distribution constrain only their combinations, not each parameter independently. The results support a composite bulge origin---an early, rapid collapse builds the majority of the mass, while a younger component is required to match the late-stage enrichment.
Figures
Figures from the paper (9 more)
Reference graph
Works this paper leans on
-
[1]
, " * write output.state after.block = add.period write newline
ENTRY address archivePrefix author booktitle chapter doi edition editor eprint howpublished institution journal key month number organization pages publisher school series title misctitle type volume year version url label extra.label sort.label short.list INTEGERS output.state before.all mid.sentence after.sentence after.block FUNCTION init.state.consts ...
-
[2]
write newline
" write newline "" before.all 'output.state := FUNCTION format.url url empty "" new.block "" url * "" * if FUNCTION format.eprint eprint empty "" archivePrefix empty "" archivePrefix "arXiv" = new.block " " eprint * " " * new.block " " eprint * " " * if if if FUNCTION format.doi doi empty "" " " doi * " " * if FUNCTION format.pid doi empty eprint empty ur...
-
[3]
Uncertainties in Galactic Chemical Evolution Models
thebibliography [1] 20pt to REFERENCES 6pt =0pt \@twocolumntrue 12pt -12pt 10pt plus 3pt =0pt =0pt =1pt plus 1pt =0pt =0pt -12pt =13pt plus 1pt =20pt =13pt plus 1pt \@M =10000 =-1.0em =0pt =0pt 0pt =0pt =1.0em @enumiv\@empty 10000 10000 `\.\@m \@noitemerr \@latex@warning Empty `thebibliography' environment \@ifnextchar \@reference \@latexerr Missing key o...
arXiv 2017
-
[4]
Abadi , M. G., Navarro , J. F., Steinmetz , M., & Eke , V. R. 2003 a , , 591, 499, 10.1086/375512
doi:10.1086/375512 2003
- [5]
-
[6]
Arentsen , A., Starkenburg , E., Martin , N. F., et al. 2020, , 491, L11, 10.1093/mnrasl/slz156
-
[8]
2010, Astronomy and Astrophysics, 519, A77, 10.1051/0004-6361/201014353
Babusiaux , C., G \'o mez , A., Hill , V., et al. 2010, Astronomy and Astrophysics, 519, A77, 10.1051/0004-6361/201014353
-
[9]
K., Matteucci , F., Origlia , L., & Rich , R
Ballero , S. K., Matteucci , F., Origlia , L., & Rich , R. M. 2007, , 467, 123, 10.1051/0004-6361:20066596
Show all 155 references
-
[11]
2018 b , , 56, 223, 10.1146/annurev-astro-081817-051826
---. 2018 b , , 56, 223, 10.1146/annurev-astro-081817-051826
2018 doi
-
[12]
2019, , 489, 1082, 10.1093/mnras/stz2158
Battino , U., Tattersall , A., Lederer-Woods , C., et al. 2019, , 489, 1082, 10.1093/mnras/stz2158
2019 doi
-
[13]
M., Cole , S., & Frenk , C
Baugh , C. M., Cole , S., & Frenk , C. S. 1996, , 283, 1361, 10.1093/mnras/283.4.1361
1996 doi
-
[14]
W., Koposov, S
Belokurov, V., Erkal, D., Evans, N. W., Koposov, S. E., & Deason, A. J. 2018, Monthly Notices of the Royal Astronomical Society, 478, 611, 10.1093/mnras/sty982
2018 doi
-
[15]
2011, Astronomy and Astrophysics, 533, A134, 10.1051/0004-6361/201117059
Bensby , T., Ad \'e n , D., Mel \'e ndez , J., et al. 2011, Astronomy and Astrophysics, 533, A134, 10.1051/0004-6361/201117059
2011 doi
-
[16]
2017, , 605, A89, 10.1051/0004-6361/201730560
Bensby , T., Feltzing , S., Gould , A., et al. 2017, , 605, A89, 10.1051/0004-6361/201730560
2017 doi
-
[17]
2008, The Astronomical Journal, 136, 2846, 10.1088/0004-6256/136/6/2846
Bigiel, F., Leroy, A., Walter, F., et al. 2008, The Astronomical Journal, 136, 2846, 10.1088/0004-6256/136/6/2846
2008 doi
-
[18]
E., Stark, A
Binney, J., Gerhard, O. E., Stark, A. A., Bally, J., & Uchida, K. I. 1991, Monthly Notices of the Royal Astronomical Society, 252, 210, 10.1093/mnras/252.2.210
1991 doi
-
[19]
2002, Monthly Notices of the Royal Astronomical Society, 330, 591, 10.1046/j.1365-8711.2002.05116.x
Bissantz, N., & Gerhard, O. 2002, Monthly Notices of the Royal Astronomical Society, 330, 591, 10.1046/j.1365-8711.2002.05116.x
2002
-
[20]
Braak, C. J. T. 2006, Statistics and Computing, 16, 239
2006
-
[21]
C., Casertano , S., et al
Calamida , A., Sahu , K. C., Casertano , S., et al. 2015, , 810, 8, 10.1088/0004-637X/810/1/8
2015 doi
-
[22]
2018, in IAU Symposium, Vol
Cescutti , G., Chiappini , C., & Hirschi , R. 2018, in IAU Symposium, Vol. 334, Rediscovering Our Galaxy, ed. C. Chiappini , I. Minchev , E. Starkenburg , & M. Valentini , 94--97, 10.1017/S1743921317008183
2018 doi
- [23]
-
[24]
J., Serenelli , A
Chaplin , W. J., Serenelli , A. M., Miglio , A., et al. 2020, Nature Astronomy, 4, 382, 10.1038/s41550-019-0975-9
2020 doi
-
[25]
2022, The Astrophysical Journal, 934, 28, 10.3847/1538-4357/ac795c
Chen, B.-H., & Li, Z.-Y. 2022, The Astrophysical Journal, 934, 28, 10.3847/1538-4357/ac795c
2022 doi
-
[26]
2001, , 554, 1044, 10.1086/321427
Chiappini , C., Matteucci , F., & Romano , D. 2001, , 554, 1044, 10.1086/321427
2001 doi
-
[27]
2003, , 339, 63, 10.1046/j.1365-8711.2003.06154.x
Chiappini , C., Romano , D., & Matteucci , F. 2003, , 339, 63, 10.1046/j.1365-8711.2003.06154.x
2003
-
[28]
2013, The Astrophysical Journal, 764, 21, 10.1088/0004-637X/764/1/21
Chieffi, A., & Limongi, M. 2013, The Astrophysical Journal, 764, 21, 10.1088/0004-637X/764/1/21
2013 doi
-
[29]
C., Fragkoudi , F., Khoperskov , S., Di Matteo , P., & Combes , F
Ciambur , B. C., Fragkoudi , F., Khoperskov , S., Di Matteo , P., & Combes , F. 2021, , 503, 2203, 10.1093/mnras/staa3814
2021 doi
-
[30]
1990, , 233, 82
Combes , F., Debbasch , F., Friedli , D., & Pfenniger , D. 1990, , 233, 82
1990
-
[31]
W., et al
C \^o t \'e , B., Ritter , C., O'Shea , B. W., et al. 2016, , 824, 82, 10.3847/0004-637X/824/2/82
2016 doi
-
[32]
W., O’Shea, B
Côté, B., Silvia, D. W., O’Shea, B. W., Smith, B., & Wise, J. H. 2018, The Astrophysical Journal, 859, 67, 10.3847/1538-4357/aabe8f
2018 doi
-
[33]
2019, The Astrophysical Journal, 887, 213, 10.3847/1538-4357/ab5a88
Côté, B., Yagüe, A., Világos, B., & Lugaro, M. 2019, The Astrophysical Journal, 887, 213, 10.3847/1538-4357/ab5a88
2019 doi
-
[34]
O., Johnson , J
Dubay , L. O., Johnson , J. A., Johnson , J. W., & Roberts , J. D. 2025, arXiv e-prints, arXiv:2508.00988, 10.48550/arXiv.2508.00988
2025 doi
- [36]
-
[37]
2015, , 454, 3641, 10.1093/mnras/stv2247
Fanali , R., Dotti , M., Fiacconi , D., & Haardt , F. 2015, , 454, 3641, 10.1093/mnras/stv2247
2015 doi
-
[38]
K., Sahlholdt , C
Feuillet , D. K., Sahlholdt , C. L., Feltzing , S., & Casagrande , L. 2021, , 508, 1489, 10.1093/mnras/stab2614
2021 doi
-
[39]
Figer , D. F. 2005, , 434, 192, 10.1038/nature03293
2005 doi
-
[40]
2012, Journal of Machine Learning Research, 13, 2171
Fortin, F.-A., De Rainville , F.-M., Gardner, M.-A., Parizeau, M., & Gagn\'e, C. 2012, Journal of Machine Learning Research, 13, 2171
2012
-
[41]
Fragkoudi , F., Grand , R. J. J., Pakmor , R., et al. 2020, , 494, 5936, 10.1093/mnras/staa1104
2020 doi
-
[42]
2020, , 499, 1116, 10.1093/mnras/staa2866
Fraser-McKelvie , A., Merrifield , M., Arag \'o n-Salamanca , A., et al. 2020, , 499, 1116, 10.1093/mnras/staa2866
2020 doi
-
[43]
1998, , 338, 161
Fuhrmann , K. 1998, , 338, 161
1998
-
[44]
Gaudi , B. S. 2022, in Bulletin of the American Astronomical Society, Vol. 54, 102.146
2022
-
[45]
2023, in American Astronomical Society Meeting Abstracts, Vol
Ghosh-Coutinho , I., Dorn-Wallenstein , T., Levesque , E., & Davenport , J. 2023, in American Astronomical Society Meeting Abstracts, Vol. 241, American Astronomical Society Meeting Abstracts \#241, 401.31
2023
-
[46]
2012, The Messenger, 147, 25
Gilmore , G., Randich , S., Asplund , M., et al. 2012, The Messenger, 147, 25
2012
-
[47]
A., Rejkuba , M., Zoccali , M., et al
Gonzalez , O. A., Rejkuba , M., Zoccali , M., et al. 2013, , 552, A110, 10.1051/0004-6361/201220842
2013 doi
-
[48]
2011, Astronomy and Astrophysics, 530, A54, 10.1051/0004-6361/201116548
---. 2011, Astronomy and Astrophysics, 530, A54, 10.1051/0004-6361/201116548
2011 doi
- [49]
-
[50]
Green, P. J. 1995, Biometrika, 82, 711. http://www.jstor.org/stable/2337340
1995
-
[51]
2005, , 441, 1055, 10.1051/0004-6361:20052926
Greggio , L. 2005, , 441, 1055, 10.1051/0004-6361:20052926
2005 doi
-
[52]
2012, , 548, A60, 10.1051/0004-6361/201219761
Grieco , V., Matteucci , F., Pipino , A., & Cescutti , G. 2012, , 548, A60, 10.1051/0004-6361/201219761
2012 doi
-
[53]
H., Johnson , J
Griffith , E., Weinberg , D. H., Johnson , J. A., et al. 2021, , 909, 77, 10.3847/1538-4357/abd6be
2021 doi
-
[54]
2021, , 656, A94, 10.1051/0004-6361/202140881
Gronow , S., C \^o t \'e , B., Lach , F., et al. 2021, , 656, A94, 10.1051/0004-6361/202140881
2021 doi
-
[55]
R., Bovy, J., Holtzman, J
Hayden, M. R., Bovy, J., Holtzman, J. A., et al. 2015, The Astrophysical Journal, 808, 132, 10.1088/0004-637X/808/2/132
2015 doi
-
[56]
2011, Astronomy and Astrophysics, 534, A80, 10.1051/0004-6361/200913757
Hill , V., Lecureur , A., G \'o mez , A., et al. 2011, Astronomy and Astrophysics, 534, A80, 10.1051/0004-6361/200913757
2011 doi
- [57]
- [58]
-
[59]
I., Rich , R
Johnson , C. I., Rich , R. M., Kobayashi , C., et al. 2013, The Astrophysical Journal, 765, 157, 10.1088/0004-637X/765/2/157
2013 doi
-
[60]
I., Rich , R
Johnson , C. I., Rich , R. M., Simion , I. T., et al. 2022, , 515, 1469, 10.1093/mnras/stac1840
2022 doi
-
[61]
I., Marchetti, T., et al
Joyce, M., Johnson, C. I., Marchetti, T., et al. 2023, The Astrophysical Journal, 946, 28, 10.3847/1538-4357/acb692
2023 doi
-
[63]
D., Pignatari, M., Stancliffe, R
Keegans, J. D., Pignatari, M., Stancliffe, R. J., et al. 2023, The Astrophysical Journal Supplement Series, 268, 8, 10.3847/1538-4365/ace102
2023 doi
-
[64]
C., & De Los Reyes , M
Kennicutt , Jr., R. C., & De Los Reyes , M. A. C. 2021, , 908, 61, 10.3847/1538-4357/abd3a2
2021 doi
-
[65]
K., Lee , Y
Kim , Y. K., Lee , Y. S., Beers , T. C., & Koo , J.-R. 2021, , 911, L21, 10.3847/2041-8213/abf35e
2021 doi
-
[66]
I., & Lugaro , M
Kobayashi , C., Karakas , A. I., & Lugaro , M. 2020, , 900, 179, 10.3847/1538-4357/abae65
2020 doi
-
[67]
I., & Umeda , H
Kobayashi , C., Karakas , A. I., & Umeda , H. 2011, , 414, 3231, 10.1111/j.1365-2966.2011.18621.x
2011
-
[68]
2020, , 643, A69, 10.1051/0004-6361/202038686
Kordopatis , G., Recio-Blanco , A., Schultheis , M., & Hill , V. 2020, , 643, A69, 10.1051/0004-6361/202038686
2020 doi
-
[69]
2001, , 322, 231, 10.1046/j.1365-8711.2001.04022.x
Kroupa , P. 2001, , 322, 231, 10.1046/j.1365-8711.2001.04022.x
2001
-
[70]
2015, , 580, A126, 10.1051/0004-6361/201424171
Kubryk , M., Prantzos , N., & Athanassoula , E. 2015, , 580, A126, 10.1051/0004-6361/201424171
2015 doi
-
[71]
M., et al
Kunder , A., Koch , A., Rich , R. M., et al. 2012, The Astronomical Journal, 143, 57, 10.1088/0004-6256/143/3/57
2012 doi
-
[72]
M., Koch , A., et al
Kunder , A., Rich , R. M., Koch , A., et al. 2016, The Astrophysical Journal, 821, L25, 10.3847/2041-8205/821/2/L25
2016 doi
-
[73]
Lane , J. M. M., Bovy , J., & Mackereth , J. T. 2023, , 526, 1209, 10.1093/mnras/stad2834
2023 doi
-
[74]
K., Walter , F., Sandstrom , K., et al
Leroy , A. K., Walter , F., Sandstrom , K., et al. 2013, , 146, 19, 10.1088/0004-6256/146/2/19
2013 doi
-
[75]
2020, , 497, 3557, 10.1093/mnras/staa2205
Lian , J., Zasowski , G., Hasselquist , S., et al. 2020, , 497, 3557, 10.1093/mnras/staa2205
2020 doi
-
[76]
C., & Newman , J
Licquia , T. C., & Newman , J. A. 2015, , 806, 96, 10.1088/0004-637X/806/1/96
2015 doi
-
[77]
2018, , 237, 13, 10.3847/1538-4365/aacb24
Limongi , M., & Chieffi , A. 2018, , 237, 13, 10.3847/1538-4365/aacb24
2018 doi
-
[78]
2024, , 976, 161, 10.3847/1538-4357/ad8352
Liu , H., Du , C., Ye , D., Zhang , J., & Deng , M. 2024, , 976, 161, 10.3847/1538-4357/ad8352
2024 doi
-
[79]
L \'o pez-Corredoira , M., Cabrera-Lavers , A., & Gerhard , O. E. 2005, , 439, 107, 10.1051/0004-6361:20053075
2005 doi
-
[80]
E., Horta, D., et al
Lucey, M., Sanderson, R. E., Horta, D., et al. 2025, The Astrophysical Journal, 982, 87, 10.3847/1538-4357/adb9e8
2025 doi
-
[81]
R., Schiavon , R
Majewski , S. R., Schiavon , R. P., Frinchaboy , P. M., et al. 2017, The Astronomical Journal, 154, 94, 10.3847/1538-3881/aa784d
2017 doi
-
[82]
2014, , 52, 107, 10.1146/annurev-astro-082812-141031
Maoz , D., Mannucci , F., & Nelemans , G. 2014, , 52, 107, 10.1146/annurev-astro-082812-141031
2014 doi
-
[83]
I., et al
Marchetti , T., Joyce , M., Johnson , C. I., et al. 2024, , 682, A96, 10.1051/0004-6361/202347570
2024 doi
-
[84]
2001, The chemical evolution of the Galaxy , Vol
Matteucci , F. 2001, The chemical evolution of the Galaxy , Vol. 253, 10.1007/978-94-010-0967-6
2001 doi
-
[85]
2021, The Astronomy and Astrophysics Review, 29, 5, 10.1007/s00159-021-00133-8
Matteucci, F. 2021, The Astronomy and Astrophysics Review, 29, 5, 10.1007/s00159-021-00133-8
2021 doi
-
[86]
1990, The Astrophysical Journal, 365, 539, 10.1086/169508
Matteucci , F., & Brocato , E. 1990, The Astrophysical Journal, 365, 539, 10.1086/169508
1990 doi
-
[87]
1986, , 154, 279
Matteucci , F., & Greggio , L. 1986, , 154, 279
1986
-
[88]
2019, , 487, 5363, 10.1093/mnras/stz1647
Matteucci , F., Grisoni , V., Spitoni , E., et al. 2019, , 487, 5363, 10.1093/mnras/stz1647
2019 doi
-
[89]
2009, , 501, 531, 10.1051/0004-6361/200911869
Matteucci , F., Spitoni , E., Recchi , S., & Valiante , R. 2009, , 501, 531, 10.1051/0004-6361/200911869
2009 doi
-
[90]
D., Beckman, R
McKay, M. D., Beckman, R. J., & Conover, W. J. 1979, Technometrics, 21, 239. http://www.jstor.org/stable/1268522
1979
-
[91]
McWilliam , A., & Rich , R. M. 1994, , 91, 749, 10.1086/191954
1994 doi
-
[92]
M., & Smecker-Hane , T
McWilliam , A., Rich , R. M., & Smecker-Hane , T. A. 2003, , 592, L21, 10.1086/377441
2003 doi
-
[93]
2010, The Astrophysical Journal, 724, 1491, 10.1088/0004-637X/724/2/1491
McWilliam , A., & Zoccali , M. 2010, The Astrophysical Journal, 724, 1491, 10.1088/0004-637X/724/2/1491
2010 doi
-
[94]
2025, arXiv e-prints, arXiv:2508.18367, 10.48550/arXiv.2508.18367
Minchev , I., Attard , K., Ratcliffe , B., et al. 2025, arXiv e-prints, arXiv:2508.18367, 10.48550/arXiv.2508.18367
2025 doi
- [95]
-
[96]
Molero , M., Matteucci , F., Spitoni , E., Rojas-Arriagada , A., & Rich , R. M. 2024, , 687, A268, 10.1051/0004-6361/202450418
2024 doi
-
[97]
2015, in The Milky Way and its Stars: Stellar Astrophysics, Galactic Archaeology, and Stellar Populations, 1
Morossi , C., Di Marcantonio , P., Franchini , M., et al. 2015, in The Milky Way and its Stars: Stellar Astrophysics, Galactic Archaeology, and Stellar Populations, 1
2015
-
[98]
C., Evans , N
Myeong , G. C., Evans , N. W., Belokurov , V., Sanders , J. L., & Koposov , S. E. 2018, , 863, L28, 10.3847/2041-8213/aad7f7
2018 doi
-
[99]
J., van Dokkum , P
Nelson , E. J., van Dokkum , P. G., F \"o rster Schreiber , N. M., et al. 2016, , 828, 27, 10.3847/0004-637X/828/1/27
2016 doi
-
[100]
2016, , 33, e022, 10.1017/pasa.2015.51
Ness , M., & Freeman , K. 2016, , 33, e022, 10.1017/pasa.2015.51
2016 doi
-
[101]
2016, The Astronomical Journal, 152, 14, 10.3847/0004-6256/152/1/14
Ness , M., & Lang , D. 2016, The Astronomical Journal, 152, 14, 10.3847/0004-6256/152/1/14
2016 doi
-
[102]
2020, , 637, A56, 10.1051/0004-6361/202037604
Neumann , J., Fragkoudi , F., P \'e rez , I., et al. 2020, , 637, A56, 10.1051/0004-6361/202037604
2020 doi
-
[103]
L., Gilbert , K., Tollerud , E., et al
Nidever , D. L., Gilbert , K., Tollerud , E., et al. 2024, in IAU Symposium, Vol. 377, Early Disk-Galaxy Formation from JWST to the Milky Way, ed. F. Tabatabaei , B. Barbuy , & Y.-S. Ting , 115--122, 10.1017/S1743921323002016
2024 doi
-
[104]
2023, , 671, A94, 10.1051/0004-6361/202245374
Nieuwmunster , N., Nandakumar , G., Spitoni , E., et al. 2023, , 671, A94, 10.1051/0004-6361/202245374
2023 doi
-
[105]
2013, Annual Review of Astronomy and Astrophysics, 51, 457, https://doi.org/10.1146/annurev-astro-082812-140956
Nomoto, K., Kobayashi, C., & Tominaga, N. 2013, Annual Review of Astronomy and Astrophysics, 51, 457, https://doi.org/10.1146/annurev-astro-082812-140956
2013 doi
-
[106]
2018, , 214, 67, 10.1007/s11214-018-0499-0
Nomoto , K., & Leung , S.-C. 2018, , 214, 67, 10.1007/s11214-018-0499-0
2018 doi
-
[107]
K., & Dubinski , J
O'Neill , J. K., & Dubinski , J. 2003, , 346, 251, 10.1046/j.1365-2966.2003.07085.x
2003
-
[108]
1995, Nature, 377, 701, 10.1038/377701a0
Ortolani , S., Renzini , A., Gilmozzi , R., et al. 1995, Nature, 377, 701, 10.1038/377701a0
1995 doi
-
[109]
A., Recio-Blanco , A., Poggio , E., et al
Palicio , P. A., Recio-Blanco , A., Poggio , E., et al. 2023, VizieR Online Data Catalog: Gaia DR3 orbital parameters and actions (Palicio+, 2023) , VizieR On-line Data Catalog: J/A+A/670/L7. Originally published in: 2023A&A...670L...7P
2023
-
[110]
2024, VizieR Online Data Catalog: Restricted sample of Gaia-ESO open clusters (Palla+, 2024) , VizieR On-line Data Catalog: J/A+A/690/A334
Palla , M., Magrini , L., Spitoni , E., et al. 2024, VizieR Online Data Catalog: Restricted sample of Gaia-ESO open clusters (Palla+, 2024) , VizieR On-line Data Catalog: J/A+A/690/A334. Originally published in: 2024A&A...690A.334P
2024
-
[111]
2008, , 687, L95, 10.1086/593350
Pignatari , M., Gallino , R., Meynet , G., et al. 2008, , 687, L95, 10.1086/593350
2008 doi
-
[112]
2016, , 225, 24, 10.3847/0067-0049/225/2/24
Pignatari , M., Herwig , F., Hirschi , R., et al. 2016, , 225, 24, 10.3847/0067-0049/225/2/24
2016 doi
-
[113]
2017, Monthly Notices of the Royal Astronomical Society, 470, 1233, 10.1093/mnras/stx1293
Portail , M., Wegg , C., Gerhard , O., & Ness , M. 2017, Monthly Notices of the Royal Astronomical Society, 470, 1233, 10.1093/mnras/stx1293
2017 doi
-
[114]
2018, Monthly Notices of the Royal Astronomical Society, 476, 3432, 10.1093/mnras/sty316
Prantzos, N., Abia, C., Limongi, M., Chieffi, A., & Cristallo, S. 2018, Monthly Notices of the Royal Astronomical Society, 476, 3432, 10.1093/mnras/sty316
2018 doi
-
[115]
Queiroz , A. B. A., Chiappini , C., Perez-Villegas , A., et al. 2021, , 656, A156, 10.1051/0004-6361/202039030
2021 doi
-
[116]
A., James , R
Raha , N., Sellwood , J. A., James , R. A., & Kahn , F. D. 1991, , 352, 411, 10.1038/352411a0
1991 doi
-
[117]
Rich , R. M. 1990 a , , 362, 604, 10.1086/169299
1990 doi
-
[118]
Rich , R. M. 1990 b , in European Southern Observatory Conference and Workshop Proceedings, Vol. 35, European Southern Observatory Conference and Workshop Proceedings, ed. B. J. Jarvis & D. M. Terndrup , 65
1990
-
[119]
2018, , 480, 538, 10.1093/mnras/sty1729
Ritter , C., Herwig , F., Jones , S., et al. 2018, , 480, 538, 10.1093/mnras/sty1729
2018 doi
-
[120]
2020, , 499, 1037, 10.1093/mnras/staa2807
Rojas-Arriagada , A., Zasowski , G., Schultheis , M., et al. 2020, , 499, 1037, 10.1093/mnras/staa2807
2020 doi
-
[121]
2018, , 609, A116, 10.1051/0004-6361/201731572
Ruiz-Dern , L., Babusiaux , C., Arenou , F., Turon , C., & Lallement , R. 2018, , 609, A116, 10.1051/0004-6361/201731572
2018 doi
-
[122]
2025, , 699, A176, 10.1051/0004-6361/202554791
Ryde , N., Nandakumar , G., Albarrac \' n , R., et al. 2025, , 699, A176, 10.1051/0004-6361/202554791
2025 doi
-
[123]
Salpeter , E. E. 1955, , 121, 161, 10.1086/145971
1955 doi
-
[124]
L., Kawata, D., Matsunaga, N., et al
Sanders, J. L., Kawata, D., Matsunaga, N., et al. 2024, Monthly Notices of the Royal Astronomical Society, 530, 2972, 10.1093/mnras/stae711
2024 doi
-
[125]
R., Chaboyer , B., et al
Sarajedini , A., Bedin , L. R., Chaboyer , B., et al. 2007, , 133, 1658, 10.1086/511979
2007 doi
-
[126]
Schneider , F. R. N., Sana , H., Evans , C. J., et al. 2018, Science, 359, 69, 10.1126/science.aan0106
2018 doi
-
[127]
2009, Monthly Notices of the Royal Astronomical Society, 396, 203, 10.1111/j.1365-2966.2009.14750.x
Schönrich, R., & Binney, J. 2009, Monthly Notices of the Royal Astronomical Society, 396, 203, 10.1111/j.1365-2966.2009.14750.x
2009
-
[128]
K., Falcón-Barroso, J., Martínez-Valpuesta, I., et al
Seidel, M. K., Falcón-Barroso, J., Martínez-Valpuesta, I., et al. 2016, Monthly Notices of the Royal Astronomical Society, 460, 3784, 10.1093/mnras/stw1209
2016 doi
-
[129]
R., & Bland-Hawthorn, J
Sharma, S., Hayden, M. R., & Bland-Hawthorn, J. 2021, Monthly Notices of the Royal Astronomical Society, 507, 5882, 10.1093/mnras/stab2015
2021 doi
-
[130]
M., Kormendy , J., et al
Shen , J., Rich , R. M., Kormendy , J., et al. 2010, The Astrophysical Journal, 720, L72, 10.1088/2041-8205/720/1/L72
2010 doi
-
[131]
J., Kasen , D., Miles , B
Shen , K. J., Kasen , D., Miles , B. J., & Townsley , D. M. 2018, , 854, 52, 10.3847/1538-4357/aaa8de
2018 doi
-
[132]
2018, , 475, 5487, 10.1093/mnras/sty150
Silva Aguirre , V., Bojsen-Hansen , M., Slumstrup , D., et al. 2018, , 475, 5487, 10.1093/mnras/sty150
2018 doi
-
[133]
2011, , 531, A72, 10.1051/0004-6361/201015749
Spitoni , E., & Matteucci , F. 2011, , 531, A72, 10.1051/0004-6361/201015749
2011 doi
-
[134]
2009, , 504, 87, 10.1051/0004-6361/200911768
Spitoni , E., Matteucci , F., Recchi , S., Cescutti , G., & Pipino , A. 2009, , 504, 87, 10.1051/0004-6361/200911768
2009 doi
-
[135]
2019, , 623, A60, 10.1051/0004-6361/201834188
Spitoni , E., Silva Aguirre , V., Matteucci , F., Calura , F., & Grisoni , V. 2019, , 623, A60, 10.1051/0004-6361/201834188
2019 doi
-
[136]
2020, , 635, A58, 10.1051/0004-6361/201937275
Spitoni , E., Verma , K., Silva Aguirre , V., & Calura , F. 2020, , 635, A58, 10.1051/0004-6361/201937275
2020 doi
- [137]
-
[138]
G., Dahlen , T., et al
Strolger , L.-G., Riess , A. G., Dahlen , T., et al. 2004, , 613, 200, 10.1086/422901
2004 doi
-
[139]
G., Dahlen, T., et al
Strolger, L.-G., Riess, A. G., Dahlen, T., et al. 2005, The Astrophysical Journal, 635, 1370, 10.1086/497534
2005 doi
-
[140]
M., Renzini , A., et al
Tacchella , S., Carollo , C. M., Renzini , A., et al. 2015, Science, 348, 314, 10.1126/science.1261094
2015 doi
-
[141]
1996, , 460, 408, 10.1086/176980
Thielemann , F.-K., Nomoto , K., & Hashimoto , M.-A. 1996, , 460, 408, 10.1086/176980
1996 doi
-
[142]
X., Woosley , S
Timmes , F. X., Woosley , S. E., & Weaver , T. A. 1995, , 98, 617, 10.1086/192172
1995 doi
-
[143]
Tinsley , B. M. 1979, , 229, 1046, 10.1086/157039
1979 doi
-
[144]
Truemam , T. C. L., Yag \"u e L \'o pez , A., Lugaro , M., & Pignatari , M. 2025, arXiv e-prints, arXiv:2509.20956, 10.48550/arXiv.2509.20956
2025 doi
-
[145]
Trueman , T. C. L., Pignatari , M., Cseh , B., et al. 2025, , 696, A164, 10.1051/0004-6361/202348255
2025 doi
-
[146]
2012, , 747, 125, 10.1088/0004-637X/747/2/125
Tsujimoto , T., & Bekki , K. 2012, , 747, 125, 10.1088/0004-637X/747/2/125
2012 doi
-
[147]
M., et al
Uttenthaler , S., Schultheis , M., Nataf , D. M., et al. 2012, , 546, A57, 10.1051/0004-6361/201219055
2012 doi
-
[148]
Valenti , E., Origlia , L., & Ferraro , F. R. 2005, , 361, 272, 10.1111/j.1365-2966.2005.09173.x
2005
-
[149]
A., et al
Valenti , E., Zoccali , M., Gonzalez , O. A., et al. 2016, , 587, L6, 10.1051/0004-6361/201527500
2016 doi
-
[150]
2013, Monthly Notices of the Royal Astronomical Society, 435, 1874, 10.1093/mnras/stt1376
Wegg , C., & Gerhard , O. 2013, Monthly Notices of the Royal Astronomical Society, 435, 1874, 10.1093/mnras/stt1376
2013 doi
-
[151]
2013, , 434, 84, 10.1093/mnras/stt1002
Weidner , C., Kroupa , P., & Pflamm-Altenburg , J. 2013, , 434, 84, 10.1093/mnras/stt1002
2013 doi
-
[152]
1994, JOM - Journal of the Minerals, Metals and Materials Society, 46, 37, 10.1007/BF03222581
Weiland , H. 1994, JOM - Journal of the Minerals, Metals and Materials Society, 46, 37, 10.1007/BF03222581
1994 doi
-
[153]
J., Downing , N
Weiss , T. J., Downing , N. J., Pinsonneault , M. H., et al. 2025, , 987, 181, 10.3847/1538-4357/adde5b
2025 doi
-
[154]
1994, Statistics and Computing, 4, 65, 10.1007/BF00175354
Whitley, D. 1994, Statistics and Computing, 4, 65, 10.1007/BF00175354
1994 doi
-
[155]
2021, , 506, 3330, 10.1093/mnras/stab1943
Wiseman , P., Sullivan , M., Smith , M., et al. 2021, , 506, 3330, 10.1093/mnras/stab1943
2021 doi
- [156]
-
[157]
2022, Nature, 603, 599, 10.1038/s41586-022-04496-5
Xiang, M., & Rix, H.-W. 2022, Nature, 603, 599, 10.1038/s41586-022-04496-5
2022 doi
-
[158]
2008, Astronomy and Astrophysics, 486, 177, 10.1051/0004-6361:200809394
Zoccali , M., Hill , V., Lecureur , A., et al. 2008, Astronomy and Astrophysics, 486, 177, 10.1051/0004-6361:200809394
2008 doi
-
[159]
Zoccali , M., Valenti , E., & Gonzalez , O. A. 2018, , 618, A147, 10.1051/0004-6361/201833147
2018 doi
Reviewed August 3, 2026 · model on record in the stance chip above.
Discussion (0). Continue with ORCID to comment.