REVIEW 3 major objections 4 minor 1 cited by
SQuIGG$\vec{L}$E: Buried star formation cannot explain the rapidly fading CO(2-1) luminosity in massive, $z\sim0.7$ post-starburst galaxies
T0 review · 3 major / 4 minor · reviewed 2026-08-05 · deepseek-v4-flash
Pith's one-line read Even maximal hidden star formation cannot explain why CO fades within ~140 Myr in massive post-starburst galaxies, so the gas-rich cases may rejuvenate.
desk verdict Solid new CO sample and a real age–CO trend; the buried-star-formation verdict is mostly right but the strongest phrasing hangs on Draine template completeness and three Herschel detections. 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 central comparison is the depletion time t_dep = M_H2/SFR against the ~140 Myr e-folding of CO(2-1) luminosity with post-starburst age. The age is t_PSB, defined as the lookback time at which the galaxy formed 99% of the stellar mass assembled in the Gyr before observation. Carrying the argument is a set of Prospector/FSPS panchromatic SED fits with energy balance, freely varying Draine et al. (2007) dust parameters, an AGN torus component, and two dust-geometry priors: 'No Buried SF,' where birth-cloud and ISM dust are tied, and 'Buried SF Allowed,' where birth-cloud dust is decoupled so star formation can hide behind optically thick clouds. The difference between the two fits brackets
What would settle it
Measure the full mid-to-far-infrared SED (roughly 20-200 um rest frame) for the CO-detected SQuIGGLE galaxies and compare the total IR luminosity with what the Draine-template extrapolation from WISE W3/W4 predicts. If the true L_IR is several times higher, hidden star-formation rates could exceed 100 Msun/yr and explain the CO decay; if it matches the template extrapolation, the paper's 'cannot explain' conclusion stands.
Extended reading notes
Core claim
Using deep ALMA CO(2-1) observations of 50 massive (log M*/Msun ~ 11.2) post-starburst galaxies at z~0.7, the paper quadruples the sample of such systems with molecular-gas measurements and confirms that CO luminosity tracks post-burst age: essentially all CO-bright galaxies have t_PSB < 200 Myr, with a fitted gas-fraction decay timescale of 70 +/- 20 Myr. If that trend is an evolutionary sequence, galaxies must drain reservoirs of a few x 10^10 Msun within about 140 Myr. New panchromatic SED fits that include WISE W3/W4 and, for three galaxies, Herschel 250 um photometry find that the mid- and far-IR emission can be produced by dust heated by the ~100 Myr-old stellar population without invo
Load-bearing premise
The conclusion assumes that the dust models used in the fits cover every plausible way the dust can emit heat; if these galaxies can hide extra luminosity at warm wavelengths where there are no measurements, the hidden star-formation rate could be much higher and the depletion-time tension could disappear.
Editorial extensions
If this is right
- Only the youngest post-starbursts (t_PSB < ~200 Myr) are CO-luminous; the stack of non-detections is 1-2 dex fainter, so if the sample is an evolutionary sequence the gas must clear in about 140 Myr.
- Allowing maximal buried star formation raises inferred star-formation rates by about 0.5 dex, yet the infrared SED does not prefer it and typical depletion times stay near ~1 Gyr rather than ~140 Myr.
- Adopting a ULIRG-like CO-to-H2 conversion (alpha_CO = 0.8) shifts gas masses down by 0.7 dex, but even combined with buried star formation it leaves depletion times above the target for most galaxies.
- There is currently no strong empirical support for heavy dust-obscured star formation or a low alpha_CO in these systems, so the age-CO trend may reflect a temporary lull rather than monotonic quenching; up to a quarter of the youngest galaxies are CO-undetected.
- Gas-rich SQuIGGLE post-starbursts may soon resume star formation ('rejuvenate') before finally becoming quiescent, rather than directly evolving into red-and-dead galaxies.
Reading between the lines
- If the age-CO trend is not an evolutionary sequence, then mass-complete spectroscopic surveys at z~0.7 should show a pile-up of young post-starbursts relative to a one-shot quenching model; measuring that pile-up would give a testable rejuvenation rate.
- The same SED-fitting machinery could be applied to higher-redshift Balmer-break submillimeter galaxies to ask whether those systems are the same phenomenon observed closer to the burst peak, with similar degeneracies between hidden star formation and dust heating by older stars.
- Deep near-infrared recombination-line spectroscopy (Pa-alpha or Br-gamma) of the CO-detected SQuIGGLE galaxies would directly measure dust-free instantaneous star-formation rates and settle whether any hidden starburst is actually present.
- Because low alpha_CO and tidal stripping both shorten the inferred depletion time, high-resolution CO and dust-continuum mapping of individual sources could reveal whether the most CO-luminous systems are mostly bound cores or diffuse tidal gas; if mostly diffuse, the inferred gas masses and the tension would shrink.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper presents ALMA CO(2-1) observations of 50 massive post-starburst galaxies from the SQuIGGLE sample at z~0.7, detecting 27/50. It confirms and strengthens the earlier finding that CO luminosity correlates with post-starburst age, fitting an exponential decay timescale of 70±20 Myr for the molecular gas fraction and arguing that detected galaxies would need to deplete their gas within ~140 Myr. The authors then perform new panchromatic SED fits with WISE W3/W4 and, for three galaxies, Herschel 250 um photometry, comparing a 'No Buried SF' prior (tau_BC tied to tau_ISM) with a 'Buried SF Allowed' prior (tau_BC free). They find that allowing buried star formation boosts inferred SFRs by only ~0.5 dex on average, changes LIR by a median of only 0.02 dex, and does not, even together with a ULIRG-like alpha_CO=0.8, bring the majority of galaxies to depletion times as short as ~140 Myr. The paper concludes that hidden starbursts cannot explain the rapid CO fading and raises the possibility that gas-rich post-starbursts are not on a direct quenching path but may rejuvenate.
Significance. If the central conclusion holds, the paper materially challenges the standard picture in which rapid gas consumption by a hidden starburst accounts for the molecular gas in young post-starburst galaxies. The ALMA sample is a substantial increase over previous work and the SED fitting is transparent, with both prior families shown and the posterior overlap between them made explicit. The manuscript also earns credit for stating its key systematic assumption in the text: the Draine et al. (2007) template completeness assumption is acknowledged in Sec. 4.1 as the basis for the tight LIR constraints. The result that the data do not require buried star formation and that the allowed boost is insufficient under the adopted templates is robust and well presented. The main weakness is that the quantitative force of 'cannot explain' is set by the same template-completeness assumption, combined with very sparse FIR data, so the conclusion is currently more model-dependent than the abstract's phrasing suggests.
major comments (3)
- [Sec. 4.1 and Sec. 5.2] The load-bearing assertion that SFRs >100 Msun/yr 'cannot coexist' with the data rests on the Draine et al. (2007) template grid spanning all possible dust SEDs. With only three Herschel/SPIRE 250 um detections (each only 3-4 sigma) and no PACS constraints for any source, the total LIR is effectively pinned by rest-frame ~10-13 um WISE photometry plus the template prior. A warm-dust component at T~60-100 K not represented in the grid could raise LIR by factors of several without violating W3/W4, and the paper's own galaxy J1157+0132 already has a Buried SF Allowed median SFR of 76 Msun/yr with an 84th percentile near 102 Msun/yr. The authors acknowledge this in Sec. 4.1, but because it is central to the conclusion, the manuscript should quantify the effect, e.g., by fitting with a supplementary warm-dust component or by reporting how high LIR can go under extended template priors. As wri
- [Sec. 2.2 and Fig. 11] The fitted 70±20 Myr decay and the inferred 140 Myr depletion target include the six galaxies from program 2021.1.00988.S, which were specifically selected as young mergers with tidal features and were detected in CO at a 5/6 rate, among the most CO-luminous in the sample. This is a deliberate selection bias in the very panel that defines the evolutionary timescale used throughout Sec. 5. The authors note the selection, but they do not test whether the exponential decay timescale or the 'detected galaxies must deplete within 140 Myr' statement changes when these six targets are removed. A robustness check excluding them, or a fit treating the selection explicitly, is needed before the 140 Myr target can be used as the quantitative standard in Secs. 5.2-5.4.
- [Sec. 4.3] The exponential decay fit to the molecular gas fraction versus t_PSB is described only as 'running 1000 fits to draws from the stellar mass and age posteriors,' with no explanation of how the CO nondetections are treated. The stacked nondetection is only a ~2 sigma detection, and the plotted upper limits cover a wide range. If the fit uses only detections, the decay timescale is biased; if it uses upper limits, the method (e.g., survival analysis, censored likelihood, or treating limits as detections at 3 sigma) should be stated. This matters because the 140 Myr number is the reference point for every depletion-time comparison in Sec. 5 and in the abstract.
minor comments (4)
- [Sec. 6] The sentence 'the assumption of a lower starburst alpha_CO alone similarly can achieve the necessary depletion times (see Figure 12c)' appears to contradict Sec. 5.3 and Figure 12c, where the majority of galaxies still fall below the 140 Myr line. This should read 'cannot achieve'.
- [Sec. 5.4] Typo: 'while even the combination of buried star formation and a and a reduction in the CO-to-H2 conversion' has a repeated 'a and a' that disrupts the sentence.
- [Fig. 7 caption] The phrase 'which which is far more representative' contains a duplicated 'which.'
- [Sec. 2.2.3] It would help to state explicitly whether the quoted WISE W3/W4 non-detections are included as upper limits in the fits and how the 3 sigma limits are computed; the text currently says only that photometry is 'included.'
Circularity Check
No significant circularity: CO and SED-inferred SFR are independent observables; the Draine-template caveat is an acknowledged modeling assumption, not a definitional identity.
full rationale
The paper's derivation chain is self-contained. The CO(2-1) luminosities are new ALMA observables; molecular gas masses are derived via standard r21=1 and alpha_CO=4 assumptions, with explicit exploration of alpha_CO=0.8. The star formation rates and post-starburst ages come from new panchromatic Prospector fits to SDSS+WISE+Herschel photometry, independent of the CO data. The depletion time t_dep = M_H2/SFR is a derived ratio, not a fitted parameter. The ~140 Myr target is the e-folding timescale of a fitted exponential to the gas-fraction-vs-age trend; using that same trend as the target for the depletion-time comparison is a physical consistency test, not a logical identity, because SFR is measured independently and could in principle have been high enough to satisfy it. The paper explicitly acknowledges the load-bearing assumption that Draine et al. (2007) templates span all possible dust SEDs (Section 4.1), and the central conclusion is explicitly qualified 'within our modeling framework' (Section 5.2); this is a prior/assumption limitation, not circularity. Self-citations (Suess et al. 2022a; Bezanson et al. 2022) provide the sample and previous trend, but they are not load-bearing as circular evidence: the present work quadruples the sample and re-derives the fits with new data. No fitted quantity is renamed as a prediction, no uniqueness theorem is imported from the authors' prior work, and no ansatz is smuggled in solely via self-citation. Hence no circular step is present.
Assumptions & free parameters
free parameters (3)
- Exponential decay timescale of gas fraction with post-starburst age =
70 +/- 20 Myr
- Birth-cloud optical depth prior (tau_BC) in Buried SF Allowed fits =
clipped Gaussian, mu=0.5, sigma=2.5
- Flexible Draine dust parameters (qPAH, Umin, gamma_e) =
qPAH in [0.1,10], Umin in [0.1,25], gamma_e in [0.0001,1]
assumptions (4)
- domain assumption Energy balance: luminosity attenuated by dust is re-radiated in the mid/far-IR following Draine et al. (2007) templates.
- ad hoc to paper Draine et al. (2007) templates span the full range of possible dust temperature and grain size distributions.
- domain assumption CO(2-1) luminosity traces H2 mass with fixed r21=1 and alphaCO=4 (fiducial), tested with alphaCO=0.8.
- domain assumption The observed 50-galaxy sample, including the merger-targeted subset, is representative enough to interpret the CO-age relation as a population trend.
Cite this review
Pith. "Pith review of SQuIGG$\vec{L}$E: Buried star formation cannot explain the rapidly fading CO(2-1) luminosity in massive, $z\sim0.7$ post-starburst galaxies." pith.science (2026). https://pith.science/paper/KAUFJU6O
@misc{pith2026250900148,
author = {Pith},
title = {Pith review of: SQuIGG$\vecL$E: Buried star formation cannot explain the rapidly fading CO(2-1) luminosity in massive, $z\sim0.7$ post-starburst galaxies},
year = {2026},
howpublished = {\url{https://pith.science/paper/KAUFJU6O}},
note = {Machine review of arXiv:2509.00148}
}
abstract
Observational and theoretical studies have long held that rapid gas consumption in starbursts is responsible for the formation of quiescent galaxies. However, studies of recently quenched ``post-starburst" galaxies have discovered that a number of them are surprisingly luminous in CO, challenging this assumption. We present deep ALMA CO(2-1) observations of 50 massive ($\log(M_\star/M_\odot)\sim11.2$) post-starburst galaxies from the SQuIGG$\vec{L}$E sample at $z\sim0.7$. We detect a large fraction (27/50) of the galaxies in CO(2-1). Furthermore, we find that the CO luminosity correlates with the age of the recent starburst, suggesting a gas-removal timescale of $\lesssim140$ Myr, an order of magnitude shorter than is implied by their rest optical star formation rates. We perform new spectral energy distribution fits incorporating mid- and far-IR photometry to test whether dust-obscured star formation can explain this trend. We find that while allowing for buried star formation can raise star formation rates by $\sim0.5$ dex, for almost all galaxies it is neither required to fit the observed IR SED, nor is it sufficient to explain the observed depletion trend. Even the combination of significant buried star formation and ULIRG-like $\alpha_{CO}$ is not enough to explain this decay in CO luminosity. Furthermore, there is no strong evidence to support either of those modifications to the depletion time. Therefore, it remains a distinct possibility that the age-CO luminosity trend should not be interpreted as an evolutionary sequence, and that gas-rich SQuIGG$\vec{L}$E galaxies will soon rejuvenate.
Figures
Figures from the paper (11 more)
Forward citations
Cited by 1 Pith paper
-
Meet the Neighbors: Gas Rich "Buddy Galaxies" are Common Around Recently Quenched Massive Galaxies in the SQuIGG$\vec{L}$E Survey
About 31% of massive post-starburst galaxies at z~0.7 have gas-rich companions, and their satellite counts match predictions for typical galaxies of the same mass.
Reference graph
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