REVIEW 4 major objections 6 minor 2 cited by
How does feedback affect the star formation histories of galaxies?
T0 review · 4 major / 6 minor · reviewed 2026-08-05 · deepseek-v4-flash
Pith's one-line read One set of equations links star formation history shape to feedback
desk verdict A careful and useful survey of how feedback shapes SFHs across three CAMELS models, but the headline unified equations are in-sample fits to an emulator and should not be treated as validated predictions. 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 machinery is a double power-law SFH parameterization plus a normalizing-flow emulator. The double power law, SFH(t) = phi * ([(t-eta)/tau]^alpha + [(t-eta)/tau]^(-beta))^(-1), compresses each average SFH into five interpretable numbers. The normalizing flow, trained on the CAMELS LH simulations, generates average SFHs anywhere in parameter space, enabling regression of those five numbers against halo mass, baryon fraction, black hole mass, and feedback scalings. Symbolic regression term frequencies and generalized additive model losses guide which physical variables enter each equation, with a bias toward galaxy state variables over direct feedback parameters.
What would settle it
Recompute average SFHs directly from the CAMELS LH simulation particle data, fit double power laws, and compare the resulting alpha, beta, tau, phi, eta to Eqn 18 on a grid of parameter values; systematic deviations beyond sampling noise would disprove universality. Specifically examine ASTRID galaxies with late-time star-formation tails: if those SFHs are not well described by a double power law, the falling-slope equation is biased.
Extended reading notes
Core claim
The paper's central discovery is a system of empirical equations, Eqn 18, describing the average SFH shape parameters in terms of Omega_m, sigma_8, halo mass, baryon fraction, relative black hole mass, and the CAMELS feedback parameters. The same functional form applies to IllustrisTNG, SIMBA, and ASTRID, with only coefficients changing (Table 2). The rising slope beta depends mainly on Omega_m; the falling slope alpha on halo mass with AGN and baryon terms; the peak/width tau on cosmology, halo mass, baryon fraction, and black hole mass; the normalization phi on halo mass times feedback corrections; and the start time eta on Omega_m. The paper further finds that stellar feedback is the domi
Load-bearing premise
The entire analysis uses SFHs sampled from a machine-learning emulator rather than directly from the simulations, and the emulator is validated only qualitatively against a small single-parameter set; if it is biased, or if the double power-law fails for a substantial fraction of average SFHs, the derived equations and conclusions inherit that distortion.
Editorial extensions
If this is right
- Observed average SFHs could constrain cosmology and stellar feedback strength using Eqn 18 without rerunning simulations.
- The same equation form should apply to other simulation codes, turning cross-model calibration into a coefficient-fitting exercise.
- Because stellar feedback changes black hole growth, SFH-based constraints on stellar and AGN feedback will remain partially degenerate.
- Reparameterizing winds by mass loading and energy per unit SFR makes the three models' SFH responses qualitatively consistent, clarifying interpretations.
Reading between the lines
- Eqn 18 is fitted on emulated SFHs; applying it to other simulation suites like SWIFT-EAGLE or CAMELS-SAM would test whether the shared functional form reflects physical regularity or a property of these three models.
- AGN feedback is almost unconstrained from SFH shape alone, so combining these equations with baryon fraction or black hole mass observations should sharpen late-time feedback constraints.
- The double power-law's poor fit to ASTRID's sustained late-time tails suggests a modified form with an added plateau could alter the predicted falling slopes and the conclusion that ASTRID galaxies quench fastest.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper studies how variations in stellar feedback, AGN feedback, and cosmology affect the average star formation histories (SFHs) of galaxies at z~0 in the CAMELS IllustrisTNG, SIMBA, and ASTRID simulations. The authors train normalizing-flow emulators on the CAMELS Latin Hypercube (LH) sets, use the emulators to sample average SFHs, and fit these with a double power-law (Eq. 13) to obtain shape parameters {α, β, τ, φ, η}. They then use random forests, generalized additive models, and symbolic regression to construct a common set of equations (Eq. 18) with model-specific coefficients (Table 2) that relate SFH shape parameters to halo mass, baryon fraction, black hole-to-halo mass ratio, and CAMELS feedback/cosmology parameters. The paper also presents interaction analyses, a reparameterization of supernova feedback in terms of mass/energy loading, an SBI-based proof-of-concept inference of CAMELS parameters from SFHs, and several supplementary observational diagnostics.
Significance. If the central claim holds—that one functional form with model-dependent coefficients describes SFH shape across three different hydrodynamical codes—this would be a useful empirical framework for connecting SFH observations to feedback physics and for interpreting CAMELS parameter-space studies. The paper's strengths include its use of the public CAMELS suite, explicit treatment of galaxy selection and resolution limits, the combination of multiple ML methods, and the extensive diagnostic figures. However, the equations in Eq. 18 are fitted to emulator-sampled SFHs, the emulator validation is only qualitative, and the coefficients carry no reported uncertainties or out-of-sample tests. These gaps are load-bearing for the 'single set of equations' claim, so the result is currently a promising but not fully supported empirical summary.
major comments (4)
- [§3.1, Appendix A (Fig. 19)] All SFHs used to build Eqn. 18 are generated by sampling the trained normalizing flows ('Unless otherwise mentioned, all the SFHs in the following sections are generated by sampling the trained normalizing flows', §3.1). The only comparison to actual simulation outputs is the qualitative 1P validation in Fig. 19, which states 'qualitative agreement' but reports no quantitative coverage, calibration, or held-out error statistic. Since Eqn. 16 minimizes loss on emulator-sampled SFHs, any emulator bias in under-sampled regions of the 6D parameter space propagates directly into the DPL parameters and hence into every coefficient in Table 2. I request a quantitative validation of the emulator against held-out LH boxes and/or the 1P runs, with per-parameter residuals and coverage diagnostics, and a demonstration that the derived Eqn. 18 coefficients are stable when the emulator is retrained or
- [§6.1.1, Eq. (18), Table 2] The central equations are presented without any measure of predictive accuracy. The coefficients in Table 2 have no uncertainties, and the loss defined in Eq. (16) is minimized on the same emulator-generated data used to select the terms. No residual plots, R² values, or held-out predictions are shown for the DPL parameters. The paper even uses the GAM loss as a 'proxy of the Bayes risk' (§3.3.2), but does not compare Eq. 18 against that benchmark. Without out-of-sample validation, the claim that 'a single set of equations ... can describe the SFHs across all three CAMELS models' is supported only by in-sample agreement. Please provide bootstrap/subsample coefficient uncertainties and a held-out evaluation (e.g., fitting coefficients on a training subset and evaluating on a withheld LH subset, or predicting one model's coefficients from another).
- [§3.2, §4.2, §6.1.1] The paper acknowledges that the double power-law 'does not describe a subset of ASTRID SFHs with sustained late-time tails' (§3.2). These ASTRID SFHs are nevertheless included in the fits that determine the ASTRID coefficients in Table 2, where α and τ are the least constrained parameters. Because Eqn. 18 is claimed to hold across all three models, the fraction of average SFHs that are poorly represented by the DPL form must be quantified, and the sensitivity of the derived coefficients to excluding or reparameterizing these cases should be shown. If the DPL failure is non-negligible in ASTRID, the corresponding rows of Table 2 may encode an artifact of the fitting form rather than the feedback response.
- [§6.1.1, Eq. (16), Eq. (18)] The claim of a 'single set of equations' is weakened by the fact that the coefficients are free to vary per model in Eq. (16). If the functional form is the same but every coefficient differs, the statement reduces to 'each model can be fit by a member of a parametric family'. The paper needs to demonstrate what is shared beyond the functional form—for example, that the same terms remain important across models, that coefficients can be predicted from model properties, or that the equations generalize to held-out models/parameters. As written, the evidence for universality is largely the symbolic-regression term frequencies in Fig. 12, which are qualitative and in-sample.
minor comments (6)
- [§3.1, Appendix A] The validation text in Appendix A repeats 'qualitative agreement' twice. Please state explicitly which quantitative metrics were computed (e.g., coverage, calibration, chi-square) and whether any failed.
- [§3.2, Eq. (13)] The text defines α as the falling slope and β as the rising slope, but Figure 1 and Eq. (13) can be misread because the two power-law terms are symmetric. Consider adding a sentence explicitly defining the relation between α, β and the t<τ versus t>τ behavior.
- [§4.3, Eq. (17)] The χ² metric in Eq. (17) has unusual units (SFR² over SFR² integrated over time). Please clarify whether the integrand is intended to be a dimensionless ratio or whether the normalization is meant to produce a time-averaged statistic.
- [§3.3.1] The random forest feature importances in Fig. 13 are shown without error bars or sensitivity checks. Given that they are used as a 'sanity check' for Eq. 18, a bootstrap estimate would strengthen the comparison.
- [§6.1.1, Eq. (18)] The equation for η is written separately with no coefficients in Table 2. For completeness, state explicitly that η = 12.5Ωm − 3 is used for all three models, and whether a coefficient uncertainty was estimated.
- [General] There are several typographical and formatting issues, including 'early rimes' in §6.1.1, inconsistent use of 'Mhalo' (log Mhalo vs Mhalo) in Eq. (18) and Table 2, and missing figure cross-references in the text. A careful proofread is recommended.
Circularity Check
No circularity: Eqn 18 is an explicitly empirical fit, not a first-principles derivation; the real weaknesses are missing out-of-sample validation and qualitative emulator checks, not a definitional loop.
full rationale
The claimed 'derivation' of Eqn 18 is openly empirical: Section 3.3.3 leaves coefficients free and minimizes L = sum_model (Theta_SFH - sum_i c_i,model f(Theta_sfh,i))^2 (Eqn 16) on Theta_SFH parameters obtained by MCMC-fitting the same normalizing-flow-sampled SFHs, and Section 6.1.1 calls the result 'empirical equations.' Fitting a response surface to its own training data is in-sample regression, not circularity; the paper does not present Eqn 18 as a held-out prediction or as a consequence of a self-citation or uniqueness theorem. The normalizing flow itself is anchored to the LH simulations and has an admittedly qualitative 1P validation in Appendix A (Fig 19), and the acknowledged DPL failure for some ASTRID SFHs with late-time tails (Section 3.2) is a stated modeling limitation. The feedback-trend conclusions in Section 4 and the mass/energy-loading reparametrization in Section 6.2 are separate empirical findings. The genuine gap is the absence of a quantitative held-out test of Eqn 18 against direct simulation SFHs; that is a validation/correctness weakness, not a circular step. No load-bearing self-citation or ansatz-smuggling was found.
Assumptions & free parameters
free parameters (1)
- SFH equation coefficients (Table 2) =
Multiple values, e.g., tau_TNG: c1=4.571, c2=0.891, c3=-0.173, c4=0.930, c5=3.236
assumptions (5)
- domain assumption The average SFH of 100 randomly selected galaxies in a box is a stable proxy for the mean SFH in that box and mass range.
- ad hoc to paper The double power-law form (Eqn 13) adequately captures the shape of average SFHs.
- domain assumption Simulation-based inference with normalizing flows trained on the LH datasets provides unbiased SFH samples across the parameter space.
- ad hoc to paper The z=0 values of baryon fraction and black hole-to-halo mass ratio are sufficient state variables to characterize the integrated feedback history relevant to SFH shape.
- domain assumption The CAMELS parameter variations (ASN1, ASN2, AAGN1, AAGN2, Omega_m, sigma_8) span the physically interesting feedback and cosmology space.
Cite this review
Pith. "Pith review of How does feedback affect the star formation histories of galaxies?." pith.science (2026). https://pith.science/paper/MXCGDHLN
@misc{pith2026250821152,
author = {Pith},
title = {Pith review of: How does feedback affect the star formation histories of galaxies?},
year = {2026},
howpublished = {\url{https://pith.science/paper/MXCGDHLN}},
note = {Machine review of arXiv:2508.21152}
}
abstract
Star formation in galaxies is regulated by the interplay of a range of processes that shape the multiphase gas in the interstellar and circumgalactic media. Using the CAMELS suite of cosmological simulations, we study the effects of varying feedback and cosmology on the average star formation histories (SFHs) of galaxies at $z\sim0$ across the IllustrisTNG, SIMBA and ASTRID galaxy formation models. We find that galaxy SFHs in all three models are sensitive to changes in stellar feedback, which affects the efficiency of baryon cycling and the rates at which central black holes grow, while effects of varying AGN feedback depend on model-dependent implementations of black hole seeding, accretion and feedback. We also find strong interaction terms that couple stellar and AGN feedback, usually by regulating the amount of gas available for the central black hole to accrete. Using a double power-law to describe the average SFHs, we derive a general set of equations relating the shape of the SFHs to physical quantities like baryon fraction and black hole mass across all three models. We find that a single set of equations (albeit with different coefficients) can describe the SFHs across all three CAMELS models, with cosmology dominating the SFH at early times, followed by halo accretion, and feedback and baryon cycling at late times. Galaxy SFHs provide a novel, complementary probe to constrain cosmology and feedback, and can connect the observational constraints from current and upcoming galaxy surveys with the physical mechanisms responsible for regulating galaxy growth and quenching.
Figures
Figures from the paper (21 more)
Forward citations
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Reference graph
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Reviewed August 5, 2026 · model on record in the stance chip above.
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