REVIEW 3 major objections 3 minor 7 cited by
Intrinsic alignment demographics for next-generation lensing: Revealing galaxy property trends with DESI Y1 direct measurements
T0 review · 3 major / 3 minor · reviewed 2026-08-06 · deepseek-v4-flash
Pith's one-line read Intrinsic alignments of galaxies are set by colour and luminosity alone: the bluest galaxies show no measurable alignment out to redshift 1.5, while red galaxies align more strongly the brighter they are.
desk verdict Largest direct IA library yet, but the abstract's 'consistent with zero' for high-z ELGs is contradicted by the paper's own 3σ fit; fix that and this is a solid measurement paper. 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 load-bearing measurement is the projected shape–density cross-correlation function $w_{g+}(r_p)$: the sum of tangential shear of shape galaxies around DESI spectroscopic density tracers, counted in transverse and line-of-sight separation bins with a modified Landy–Szalay estimator and integrated along the line of sight. Two models interpret it: NLA, which ties galaxy ellipticity linearly to the tidal field with a non-linear power-spectrum correction, and TATT, which adds a tidal-torquing term and is fit to smaller scales; both are jointly fit to $w_{g+}$ and the projected galaxy clustering $w_{gg}$. The paper also defines a model-free 'IA amplitude'—a scaled ratio of $w_{g+}$ to $\sqrt{w_{gg}}$—so alignment strength can be compared across colour, luminosity, mass, and redshift bins without committing to a model.
What would settle it
Compute the magnification contribution to $w_{g+}$ for the high-redshift ELG sample ($1.15<z<1.55$) from the ELG number-count slope at the survey's magnitude limit: if the predicted magnification term rivals the measurement uncertainty on 6–65 Mpc/h scales, the zero-alignment inference for that sample is not secure, and the claim that blue galaxies are unaligned out to z≈1.5 would need revision. A second check is to measure $w_{g+}$ for the bluest BGS galaxies ($M_r-M_z<0.5$) with a deeper shear catalogue than SDSS, DES, or KiDS; a detection above $3\sigma$ would falsify the low-redshift null directly.
Extended reading notes
Core claim
The central claim is that intrinsic alignment amplitude in DESI galaxies is set by galaxy type, not by cosmic epoch: under both the NLA and TATT models, blue star-forming galaxies—the blue half of the low-redshift BGS sample (rest-frame $M_r-M_z<0.5$) and the emission-line galaxies at $0.8<z<1.55$—have alignment amplitudes consistent with zero, while red galaxies align strongly and more so at higher luminosity. The paper builds a library of over twenty independent subsamples spanning four magnitudes in luminosity, and finds that a model combining a double power law in luminosity with a linear term in rest-frame colour fits every measured amplitude with reduced $\chi^2_\nu=1.6$, leaving no residual trend in redshift or stellar mass. The conclusion is twofold: the bluest galaxies are effectively unaligned and can anchor low-IA cosmic-shear samples, and the alignment of the rest of the population can be predicted, and hence marginalized over, from colour and luminosity alone.
Load-bearing premise
The results assume that on separations of 6 to 65 Mpc/h (2 to 65 Mpc/h for TATT) the measured shape-density signal is dominated by intrinsic alignment, with gravitational lensing of background shapes and magnification effects neglected; if magnification contributes significantly for the high-redshift emission-line galaxies at z>1.15, the inferred zero alignments could be biased.
Editorial extensions
If this is right
- Cosmic shear surveys can build 'blue shear' samples—galaxies with $M_r-M_z<0.5$, roughly the bluest 30% of the BGS—that contribute negligible intrinsic alignment while retaining most of the source density.
- IA model priors for DESI-like populations need only luminosity and colour dependence; dropping redshift dependence avoids the cosmological precision loss that flexible models such as TATT incur.
- Any of the three stellar-age proxies—rest-frame colour, 4000 Å break strength, or specific star formation rate—selects weakly aligned galaxies equally well, so surveys can use whichever quantity they measure best.
- The continuous rise of $A_{IA}$ as redder galaxies enter the sample means the IA contamination of a shear sample is tunable by the colour cut, giving a direct handle on the trade between systematic and shot noise.
- The null detection of blue-galaxy alignments, now spanning $z\approx0.05$–$1.55$, extends the redshift range over which 'blue shear' is a viable strategy to cover most of the source redshifts of current Stage III lensing surveys.
Reading between the lines
- The claim that luminosity and colour suffice without redshift dependence is established only over $0<z<1.5$ and down to DESI's magnitude limits; for fainter LSST-like galaxies ($r\gtrsim24.5$), mass or redshift trends that are degenerate in this sample could still appear.
- A blind test of the no-redshift-dependence claim would be to predict the IA amplitude of LRG samples at $z>1.1$ from the fitted luminosity–colour relation before measuring them, then check the residuals; the paper itself does not attempt this.
- The paper notes a tentative trend in Appendix F that faint blue galaxies appear more aligned than bright blue ones; if deeper data confirm it, the simple 'blue means unaligned' rule would need qualification, and satellite alignments would become a distinct mechanism to model.
- The library format invites a direct extension: cutting the same $w_{g+}$ measurements simultaneously by the three stellar-age proxies could separate stellar age from stellar mass as the physical driver of red-galaxy alignment in a way the current binned analysis cannot.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. This manuscript presents direct measurements of intrinsic alignments (IA) using DESI DR1 spectroscopic galaxies cross-matched to public shear catalogues from DES, KiDS, HSC, and SDSS. The authors measure the projected shape–density correlation w_g+ and the projected clustering w_gg for BGS, LRG, and ELG samples, split by colour, luminosity, and redshift, and fit the measurements with NLA and TATT models. They report that red, luminous galaxies are strongly aligned; that blue, star-forming galaxies have alignments consistent with zero out to z~1.55; that the alignment of red galaxies is sufficiently described by luminosity and colour without explicit redshift dependence; and they provide a recommended blue-galaxy selection for future cosmic shear analyses. The paper also compares its sample coverage to future lensing surveys.
Significance. If the results hold, this paper provides one of the most extensive direct IA demographic libraries to date, with roughly an order of magnitude more galaxies than previous spectroscopic IA studies and with consistency checks across four independent shape catalogues. The measurement pipeline is careful: it uses publicly available calibrated shear catalogues, jointly fits w_g+ and w_gg, validates against mocks, uses jackknife covariances matched to the largest scales, and checks cross-survey consistency and scale-cut dependence. The blue-shear selection and the luminosity–colour scaling are of immediate use for cosmic shear analyses. However, the central null claim for high-redshift blue galaxies is contradicted by the paper's own best-fit NLA amplitude for the high-z ELG sample, and the neglected lensing/magnification terms are potentially important for that same bin. These issues must be resolved before the headline conclusions can be accepted.
major comments (3)
- [Section 4.2, Table 3, and Figure 3] The headline null claim for high-redshift blue galaxies is contradicted by the paper's own NLA fit. Table 3 reports A_IA = -3.0 +1.0/-1.0 for the high-z (1.15<z<1.55) ELG sample, a 3-sigma non-zero value, and Table E1 repeats this value. Figure 3 instead labels the same panel 'AIA = 3 ± 1', so the sign is not consistent between the table and the figure. Section 4.2 and the abstract state that ELGs are consistent with no intrinsic alignment 'regardless of redshift'. If the table is correct, the abstract's claim is false for the high-z sample; if the figure is correct, the table and Appendix E are wrong. In either case, the manuscript must be corrected and the conclusions re-assessed.
- [Section 3.2] The neglect of magnification and galaxy-galaxy lensing in the w_g+ modelling is stated rather than quantified. This assumption is load-bearing for the null claims and is especially concerning for the high-z ELG sample, where the best-fit NLA amplitude is 3 sigma from zero: a spurious negative amplitude could arise from uncorrected lensing or magnification if the HSC shape sample contains sources behind the DESI ELGs. Please estimate the size of these contributions for the high-z ELG bin (e.g., using the DESI and HSC redshift distributions and the relevant lensing kernels), or restrict the null claim to be conditional on this approximation.
- [Section 5 and Figure 8] The claim that IA amplitude is 'entirely explained' by luminosity and colour, with no need for explicit redshift dependence, is supported only by a reduced chi-squared of 1.6 and a visual inspection of residuals. The paper does not present a model that adds an explicit redshift term and compare it to the luminosity–colour model, e.g., through a change in chi-squared or an information criterion. Since this no-redshift-dependence statement appears in the abstract and conclusions, please add a quantitative model comparison or rephrase the claim as 'no residual redshift trend is detected in our bins'.
minor comments (3)
- [Section 5, Eq. (11)] Calling this quantity 'model-free' is misleading because the constants M=10^6 and B=0.3 are chosen to make the amplitude approximate A_IA; this is a calibrated summary statistic rather than a model-free measurement, and the choice of scaling deserves a sentence of justification.
- [Data Availability section] The companion modelling paper is referred to as 'Jeffreys et al.' in the Data Availability section but as 'Jeffrey et al.' elsewhere; please harmonize the spelling.
- [Figure 2 caption] The caption says the co-added measurements are shown for BGS, LRG, and ELG, but the ELG panel is labelled 'ELG | HSC' and is not a co-add across surveys; please clarify the caption.
Circularity Check
No significant circularity: the IA results are empirical measurements fitted to data, not derived from their own inputs.
full rationale
The paper's central claims are direct measurements of w_g+ and w_gg using independent DESI spectroscopic redshifts and external imaging shear catalogues. The NLA and TATT amplitudes are free parameters fitted to those measurements, so statements like 'the bluest galaxies have an alignment consistent with zero' are data constraints rather than predictions obtained from the model. The only self-references (Jeffrey et al. in prep, McCullough et al. 2024, Lamman et al. 2024) are deferred modelling, context, or a review, and none of them supplies the load-bearing content of the analysis. Equation (11)'s 'model-free' amplitude uses fixed constants M=10^6 and B=0.3 chosen to approximate A_IA, but this is only a descriptive rescaling of measured correlations and is not used to predict the trends it summarizes; no conclusion reduces to these constants by construction. I find no step where a claimed result is equivalent to an input by definition or by a self-citation chain. A separate, non-circular correctness concern is that Table 3 reports A_IA = -3.0 ± 1.0 for the high-redshift ELG sample while Figure 3 shows 'AIA = 3 ± 1'; this internal inconsistency is not a circularity issue but should be resolved before interpreting the null claim for that sample.
Assumptions & free parameters
free parameters (6)
- A_IA (NLA amplitude) for each blue BGS selection =
0.1±0.3 (Mr-Mz<0.5); 0.9±0.2 (<0.6); 1.4±0.2 (<0.65)
- A_IA for low-z and high-z ELG samples =
0±1 and -3±1
- TATT parameters A1, A2, b_TA per sample =
e.g., A1=0.2±0.4, A2=-0.1±0.6 for BGS blue selection; reported ranges in Table 3
- Galaxy bias parameters b1, b2 =
b1 values ~1.14 to 1.45 across samples (Table E1); b2 small
- Model-free amplitude scaling constants M and B =
M=1e6, B=0.3
- Luminosity-colour model parameters (double power law in M_r and linear in colour) =
Not reported in the paper, deferred to companion paper
assumptions (6)
- domain assumption NLA model is valid on scales 6 to 65 Mpc/h, and TATT on 2 to 65 Mpc/h, with linear galaxy bias for NLA and second-order bias for TATT.
- domain assumption Magnification and galaxy-galaxy lensing contributions to wg+ are negligible.
- domain assumption Shear calibrations and responsivities from the four imaging surveys are accurate.
- domain assumption Rest-frame colours, luminosities, and stellar masses derived from FastSpecFit and CIGALE are reliable.
- standard math Flat LCDM cosmology with Omega_m=0.3 and Omega_Lambda=0.7 for distance conversions.
- domain assumption Jackknife resampling provides unbiased covariance estimates for the correlation functions.
Cite this review
Pith. "Pith review of Intrinsic alignment demographics for next-generation lensing: Revealing galaxy property trends with DESI Y1 direct measurements." pith.science (2026). https://pith.science/paper/6LAQSJPT
@misc{pith2026250711530,
author = {Pith},
title = {Pith review of: Intrinsic alignment demographics for next-generation lensing: Revealing galaxy property trends with DESI Y1 direct measurements},
year = {2026},
howpublished = {\url{https://pith.science/paper/6LAQSJPT}},
note = {Machine review of arXiv:2507.11530}
}
abstract
We present direct measurements of the intrinsic alignments (IA) of over 2 million spectroscopic galaxies using DESI Data Release 1 and imaging from four lensing surveys: DES, HSC, KiDS, and SDSS. In this uniquely data-rich regime, we take initial steps towards a more tailored IA modelling approach by building a library of IA measurements across colour, luminosity, stellar mass, and redshift. We map the dependence between galaxy type -- in terms of rest-frame colour, strength of the 4000 Angstrom break, and specific star formation rate -- and IA amplitude; the bluest galaxies have an alignment consistent with zero, across low ($0.05<z<0.5$) and high ($0.8<z<1.55$) redshifts. In order to construct cosmic shear samples that are minimally impacted by IA but maintain maximum sample size and statistical power, we map the dependence of alignment with colour purity. Red, quenched galaxies are strongly aligned and the amplitude of the signal increases with luminosity, which is tightly correlated with stellar mass in our catalogues. For DESI galaxies between $0<z<1.5$, trends in luminosity and colour alone are sufficient to explain the alignments we measure -- with no need for an explicit redshift dependence. In a companion paper (Jeffrey et al., in prep), we perform detailed modelling of the IA signals with significant detections, including model comparison. Finally, to direct efforts for future IA measurements, we juxtapose the colour-magnitude-redshift coverage of existing IA measurements against modern and future lensing surveys.
Figures
Figures from the paper (6 more)
Forward citations
Cited by 7 Pith papers
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Cross-correlation of SPT-3G D1 CMB lensing and DES Y3 galaxy lensing
Cross-correlation of SPT-3G D1 CMB lensing and DES Y3 galaxy lensing measures S8 = 0.833^{+0.047}_{-0.061} at 14 sigma using polarization-only reconstruction, consistent with Planck and DES Y3.
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Density-Shear Baryon Acoustic Oscillation as a Cosmological Consistency Check
GI BAO provides a robust consistency check for density BAO and shear data, with the first photometric measurement on DES Y3 showing agreement at α = 0.966 ± 0.252.
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Density-Shear Baryon Acoustic Oscillation as a Cosmological Consistency Check
First GI BAO measurement from DES Y3 photometric data yields α = 0.966 ± 0.252, consistent with density BAO α = 0.966 ± 0.037 at 0.86σ detection.
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The Environmental Dependence of Halo Intrinsic Alignments: Stronger Signals in Underdense Regions
At fixed halo mass, underdense environments produce systematically larger IA amplitudes (factor ~1.5–1.8) than overdense ones, driven by both stronger tidal alignment and greater intrinsic elongation.
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Assembly bias and the redshift evolution of intrinsic alignments for LRGs
FLAMINGO simulation analysis shows IA amplitude for LRGs depends on halo assembly history and exhibits redshift evolution beyond mass effects, yielding an empirical mass-redshift model.
-
Cross-correlation of SPT-3G D1 CMB lensing and DES Y3 galaxy lensing
Cross-correlation of SPT-3G CMB lensing and DES Y3 galaxy lensing measured at 14 sigma significance yields S8 = 0.833 +0.047 -0.061, consistent with Planck and DES Y3 shear-only results.
-
Simulation budgeting for hybrid effective field theories
Forecasts that under 225 N-body simulations suffice for 1-2% accurate HEFT emulators over wide w0waCDM + m_nu parameter space, with as few as 80 for restricted volumes.
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