REVIEW 4 major objections 6 minor 2 cited by
EPOCHS XI: The Structure and Morphology of Galaxies in the Epoch of Reionization to z ~ 12.5
T0 review · 4 major / 6 minor · reviewed 2026-08-11 · deepseek-v4-flash
Pith's one-line read This paper shows that the known decline of galaxy half-light radius with redshift continues to $z \sim 12.5$, with $R_e = (2.12 \pm 0.28)\,(1+z)^{-0.67 \pm 0.06}$ kpc, and that at fixed stellar mass galaxies were more compact earlier…
desk verdict Solid extension of size evolution to z~12.5 with a larger sample, but the abstract/body numbers disagree and the redshift-simulation test misses the wavelength shift it claims to cover. 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 argument is carried by single-component S\'ersic profile fits made with GALFIT in the JWST NIRCam F444W band, chosen to sample rest-frame optical light and to minimize morphological K-correction; the half-light radius $R_e$, S\'ersic index $n$, and axis ratio $b/a$ from these fits are the parametric measurements. Non-parametric concentration and asymmetry are measured with Morfometryka, and the asymmetry criterion $A > 0.35$ from the CAS system is used to classify mergers. To rule out redshift-dependent observational biases, a subsample of 285 galaxies is artificially redshifted in steps of $\Delta z = 1$ up to $z = 12$ using the AREIA code, which rebins, dims, adds shot noise, and re-convolves sources with the F444W PSF, and the remeasured parameters are compared as fractional changes. The flat fractional-change trends for size, axis ratio, and asymmetry constitute the key check that the observed evolution is not an artifact.
What would settle it
If a substantial fraction of the $z \sim 9$-$12$ candidates were reassigned to neighboring redshifts by JWST/NIRSpec spectroscopy, and the size-redshift or size-mass trends flattened after reassignment, the central claim would fail. A direct test would take the 520 galaxies, measure spectroscopic redshifts for as many as possible, and re-derive the $R_e(z)$ power law and the size-mass normalization with the secure redshifts only; if the smaller sizes at $z \sim 10$-$12$ disappear, the evolutionary interpretation is wrong.
Extended reading notes
Core claim
The central claim is that galaxy structure evolution continues into the Epoch of Reionization: in rest-frame optical light (F444W), galaxies become progressively smaller with increasing redshift out to $z \sim 12.5$, and the size-mass relation shifts so that galaxies of a given stellar mass are smaller at earlier times. The paper quantifies this with a single S\'ersic half-light radius that declines as $R_e = (2.12 \pm 0.28)\,(1+z)^{-0.67 \pm 0.06}$ kpc, and with a size-mass relation whose normalization drops from $\log_{10}(R_{e0}/\mathrm{kpc}) \sim -0.6$ to $-0.77$ across redshift bins, corresponding to a roughly 53% size increase for a $\log(M_*/M_\odot) = 8$ galaxy in about 400 Myr. In addition, non-parametric asymmetry measurements give a merger fraction of $f_m = 0.12 \pm 0.07$, consistent with the roughly constant $f_m \sim 0.1$ seen at $z < 9$, and the sample shows an excess of round, high-axis-ratio objects among the most compact galaxies. The paper's redshift-simulation check finds flat fractional changes in size, axis ratio, and asymmetry when real galaxies are artificially moved to higher redshifts, which is taken as evidence that the observed trends reflect real evolution rather than surface-brightness or resolution effects.
Load-bearing premise
The analysis assumes that the photometric redshifts and SED-derived stellar masses are accurate enough to bin galaxies by redshift and mass; the paper itself notes that photo-z scattering occurs near $z \sim 10$ because the Lyman break lies between the F115W and F150W filters, and only a small fraction of the sample has spectroscopic confirmation.
Editorial extensions
If this is right
- If the trend is real, the small sizes of very high-redshift galaxies are a genuine evolutionary phase, not a selection or resolution artifact.
- Galaxies of a given mass being roughly 53% larger only 400 Myr later implies rapid size growth in the first half-billion years of galaxy assembly.
- A merger fraction near 0.12 with little redshift evolution from $z \sim 4$ to $z \sim 12$ implies that mergers were already assembling galaxies in the Epoch of Reionization.
- The trend also holds for Petrosian radii, so galaxies grow in total size, not just in their half-light radii.
- The excess of round, compact objects suggests that many early galaxies were either intrinsically round or dominated by a bright core whose outer diffuse component is too faint to detect.
Reading between the lines
- If confirmed with spectroscopy, the size-mass evolution provides a tight timeline for feedback-driven size growth: dense, lower-mass galaxies must puff up by about 50% within roughly 400 Myr, which simulations will need to reproduce without overproducing massive compact remnants.
- Because no mass cut was applied, the sample is dominated by low-mass galaxies; deeper, wider surveys should test whether the same power law holds for $\log(M_*/M_\odot) > 9$ at $z > 8$, where current numbers are small.
- The high axis ratios of compact galaxies could partly reflect a bright unresolved core; stacking the compact objects to search for faint extended emission would distinguish intrinsically round galaxies from core-dominated ones, a test the paper leaves implicit.
- If photo-z scattering at $z \sim 10$ is as strong as the paper suggests, the true size at $z \sim 10$-$12$ could be even smaller or larger than measured; targeted spectroscopic follow-up of the dip at $z \sim 10$ would sharpen the evolutionary interpretation.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. This paper presents a structural analysis of 520 (or 521, depending on the manuscript version; see Major Comment 1) galaxy candidates at 6.5 < z < 12.5 from the EPOCHS v1 survey, using GALFIT single-Sersic fits in F444W and Morfometryka non-parametric measurements. The authors derive a size evolution Re = (2.12 ± 0.28)(1+z)^(-0.67 ± 0.06) kpc (full-text version), report a size-mass relation whose normalization evolves such that galaxies of fixed mass are smaller at higher redshift, measure a merger fraction fm = 0.12 ± 0.07, and find an excess of round, compact objects. They use AREIA artificial redshift simulations to argue that the observed size, axis-ratio, and asymmetry trends are real evolutionary effects rather than redshift-dependent observational artifacts.
Significance. If the results hold, they extend the known size evolution of galaxies into the epoch of reionization and support the interpretation that the compactness of z > 6.5 galaxies is a genuine evolutionary phase. The paper's strengths include the use of multiple independent size measures (Sersic, Petrosian, Kron), tests of PSF systematics (Appendix C), recovery simulations of Sersic profiles (Appendix E), and a uniform reduction across six JWST fields. The paper also makes comparisons with simulations and previous work. The main technical risk is the incompleteness of the artificial redshift simulation in reproducing rest-frame wavelength changes, and the internal inconsistency in the abstract's headline numbers.
major comments (4)
- [Abstract and Section 8] The arXiv version of the abstract quotes 521 galaxies and Re = (2.74 ± 0.49)(1+z)^(-0.79 ± 0.08) kpc, while the full-text abstract and the conclusions in Section 8 quote 520 galaxies and Re = (2.12 ± 0.28)(1+z)^(-0.67 ± 0.06) kpc. These are the two central quantitative claims of the paper, and the discrepancy must be reconciled before publication; it also raises the question of which version corresponds to the submitted analysis.
- [Section 6.5 and Figures 13/Table 3] The AREIA simulation re-bins and flux-scales the F444W image and convolves it with the F444W PSF, but it does not change the rest-frame wavelength of the light being observed. At z ~ 7 F444W samples rest-frame ~0.55 micron, while at the simulated z ~ 12 it would sample ~0.34 micron in a real observation. Since galaxy size is wavelength-dependent, the simulation cannot test whether part of the observed size decline from z ~ 7 to z ~ 12 is a morphological K-correction. The claim in Section 6.5 that the simulation shows the trends 'are due to real evolutionary effects and not redshift effects' is therefore stronger than the simulation supports. Please either include wavelength-dependent mock observations (e.g., using multi-band imaging to assign rest-frame wavelength-dependent morphologies) or explicitly quantify the expected K-correction and revise the claim accordingly.
- [Section 3.2 and Section 6.1] The photometric redshift uncertainty, including the admitted z ~ 10 scattering between F115W and F150W, is not propagated into the size-redshift power law or the size-mass relation. The size-mass relation (Table 1) assumes a fixed gradient from the 6.5 < z < 7.5 bin, so the claimed evolution is entirely in the normalization; this assumption should be checked (e.g., by allowing the slope to vary in stacked bins) and the effect of photo-z scatter on the bin medians should be quantified or at least discussed as a systematic.
- [Section 5.3 and Appendix A] 73 of the 520 galaxies (14%) have their Sersic index fixed to n = 0.05 after failing the free-fit criteria. While Appendix A shows similar sizes for n = 0.05 and n = 1, the possibility that these objects are systematically different (e.g., higher-n compact objects) could bias the median sizes and the size evolution. Please show that the main results are robust to excluding these 73 objects.
minor comments (6)
- [Section 4.1] The paper states that F444W is used to 'best probe the rest frame optical', but at z > 9 F444W corresponds to rest-frame UV (~340 nm at z = 12). The wording should be adjusted, and the caveat that the rest-frame wavelength varies across the sample should be stated wherever morphological K-correction is discussed.
- [Section 6.5] The phrase 'all known cosmological effects' in Section 6.5 is an overstatement; the simulation includes geometric rebinning, surface brightness dimming, and noise, but not wavelength-dependent morphology or color-dependent PSF variations.
- [Table 2] The header rows use approximate redshifts (7, 8, 9, 10.5, 12) rather than the bin definitions in the text; please make the bins consistent for reproducibility.
- [Figure 2] The cutout mosaics would benefit from a scale bar in physical kpc at each redshift; currently the PSF FWHM is shown but not a kpc scale, making visual size comparisons difficult.
- [Appendix B] The NMAD values in Table 4 are useful, but the sample used (235 galaxies) is a subset; please state whether the F410M trends are verified on the same redshift bins and with the same selection.
- [References] Several entries have only arXiv IDs (e.g., Adams et al. 2024) and should be updated with accepted journal references where available.
Circularity Check
No significant circularity: the size trends are fits to measured GALFIT/Morfometryka parameters, the AREIA redshift simulation is a consistency control rather than a self-derived prediction, and the self-citations are data products and external calibrations rather than self-referential derivations.
full rationale
EPOCHS XI is an observational measurement paper, not a derivation from assumed inputs. The size-redshift power law (Eq. 6) and the size-mass relation are fits to measured half-light radii and Bagpipes stellar masses, so there is no fitted parameter renamed as a prediction. The merger fraction uses the externally calibrated CAS asymmetry threshold (Conselice 2003) applied to measured asymmetry values; the threshold is not re-derived here, and the comparison with independent pair-fraction work provides external anchoring. The AREIA artificial-redshift experiment is a control check: it re-observes the same galaxies at higher redshifts and measures whether the included observational effects (geometric rebinning, cosmological surface-brightness dimming, PSF, noise) reproduce the observed decline. The near-flat recovered size gradient supports the claim that the observed decline is not produced by those effects. A caveat is that the simulation re-uses the F444W image and therefore does not simulate the morphological K-correction as the band shifts from rest-frame optical at z~7 to rest-frame UV at z~12; this is a completeness limitation of the control, not a circular reduction of the conclusion to its inputs. Self-citations to EPOCHS v1 (Conselice et al. 2024) and Harvey et al. (2024) provide the catalogue, photometric redshifts, and stellar masses, but the structural measurements and the trends are made independently in this paper. No step defines or fits the claimed result in terms of itself, and no specific equation or construction can be exhibited in which a prediction is equivalent to an input by definition.
Assumptions & free parameters
free parameters (5)
- Size evolution power-law normalization and slope =
A = 2.12 ± 0.28 kpc, beta = -0.67 ± 0.06 in Re = A(1+z)^beta
- Size-mass relation gradient =
0.04 ± 0.02 dex(kpc)/dex(M*)
- Fixed Sersic index for failed fits =
n = 0.05
- Residual flux fraction cutoff =
RFF < 0.5
- Signal-to-noise threshold =
SNR > 10 sigma in F444W
assumptions (6)
- domain assumption The Sersic profile with the Ciotti and Bertin bn approximation is an adequate model for high-z galaxy light distributions.
- domain assumption The simulated WebbPSF model accurately represents the F444W PSF.
- domain assumption Photometric redshifts from EAZY and stellar masses from Bagpipes with the log-normal SFH prior are accurate enough for redshift binning and the size-mass relation.
- domain assumption The CAS asymmetry criterion A>0.35 and A>S, calibrated at lower redshift, remains valid for classifying mergers at z>6.5.
- domain assumption The AREIA artificial redshift simulations capture all relevant redshift-dependent observational effects.
- domain assumption Single-component Sersic fits in F444W probe rest-frame optical structure without significant morphological K-correction.
Cite this review
Pith. "Pith review of EPOCHS XI: The Structure and Morphology of Galaxies in the Epoch of Reionization to z ~ 12.5." pith.science (2026). https://pith.science/paper/MHKT7A3O
@misc{pith2026241214970,
author = {Pith},
title = {Pith review of: EPOCHS XI: The Structure and Morphology of Galaxies in the Epoch of Reionization to z ~ 12.5},
year = {2026},
howpublished = {\url{https://pith.science/paper/MHKT7A3O}},
note = {Machine review of arXiv:2412.14970}
}
abstract
We present a structural analysis of 521 galaxy candidates at 6.5 < z < 12.5, with $SNR > 10\sigma$ in the F444W filter, taken from the EPOCHS v1 sample, consisting of uniformly reduced deep JWST NIRCam data, covering the CEERS, JADES GOOD-S, NGDEEP, SMACS0723, GLASS and PEARLS surveys. We use standard software to fit single S\'ersic models to each galaxy in the rest-frame optical and extract their parametric structural parameters (S\'ersic index, half-light radius and axis-ratio), and \texttt{Morfometryka} to measure their non-parametric concentration and asymmetry parameters. We find a wide range of sizes for these early galaxies, but with a strong galaxy-size mass correlation up to $z \sim 12$ such that galaxy sizes continue to get progressively smaller in the high-redshift regime, following $R_{e} = 2.74 \pm 0.49 \left( 1 + z \right) ^{-0.79 \pm 0.08}$ kpc. Using non-parametric methods we find that galaxy merger fractions, classified through asymmetry parameters, at these redshifts remain consistent with those in literature, maintaining a value of $f_{m} \sim 0.12 \pm 0.07$ showing little dependence with redshift when combined with literature at $z > 4$. We find that galaxies which are smaller in size also appear rounder, with an excess of high axis-ratio objects. Finally, we artificially redshift a subsample of our objects to determine how robust the observational trends we see are, determining that observed trends are due to real evolutionary effects, rather than being a consequence of redshift effects.
Forward citations
Cited by 2 Pith papers
-
Morphological Demographics of Galaxies at $z\sim 10-16$: Log-Normal Size Distribution and Exponential Profiles Consistent with the Disk Formation Scenario
Galaxies at z=10-16 have a log-normal size distribution with sigma 0.52, nearly uniform axis ratios, and exponential profiles, consistent with early disk formation.
-
Evolution of Size, Mass, and Density of Galaxies Since Cosmic Dawn
Under the author's CCC+TL cosmology, galaxy effective radii are larger by roughly (1+z)^0.93, reducing the inferred density and mass of early galaxies.
Reference graph
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