REVIEW 3 major objections 5 minor 121 references
UV bright red-sequence galaxies: how do UV upturn systems evolve in redshift and stellar mass?
T0 review · 3 major / 5 minor · reviewed 2026-08-14 · deepseek-v4-flash
Pith's one-line read The proportion of UV upturn galaxies among red-sequence galaxies rises with stellar mass and peaks near z≈0.25.
desk verdict A plausible but not secure measurement of UV upturn prevalence among field red-sequence galaxies; the mass trend is the robust part, while the claimed redshift infall and uncorrected selection need work. 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 analysis rests on a Bayesian logistic regression for the binary outcome 'UV upturn versus UV weak'. The logit of the probability is modelled as a second-degree polynomial in redshift and stellar mass, with a hierarchical term for WHAN emission-line classes, so the dependence on $z$ and $\log M_\star$ is estimated jointly rather than in bins. The other load-bearing piece is the adopted colour-class cut: $(NUV-r)>5.4$ picks UV-bright red-sequence galaxies, and $(FUV-NUV)<0.9$ with $(FUV-r)<6.6$ separates UV upturn hosts from UV weak ones. Stratifying by WHAN classes (star-forming, strong and weak AGN, retired/passive, unclassified) is what lets the paper attribute the overall trends to quiescent galaxies.
What would settle it
Re-run the same sample and model after applying the paper's own internal-extinction corrections ($A_{\rm FUV}=2.536A_V$, $A_{\rm NUV}=2.045A_V$, $A_r=0.8695A_V$, with $A_V\approx0.2$ for UV weak systems and lower for UV upturn systems) and after adding a term for GALEX FUV detection probability. If the $z\approx0.25$ peak and the rising mass trend in retired/passive galaxies disappear or reverse under these corrections, the central claim fails; if they persist, it would be corroborated.
Extended reading notes
Core claim
The central claim is that the probability that a UV-bright red-sequence galaxy manifests the UV upturn is not constant: it depends on both stellar mass and redshift, and the cleanest, most statistically reliable trend is in retired/passive (quiescent, lineless) systems. In those systems the upturn fraction increases with stellar mass over roughly $\log M_\star \approx 10$–$11.5$ and, in redshift, rises to a maximum around $z\approx0.20$–$0.25$ before declining out to $z\approx0.35$; the paper states that this decline is clearly seen. Broadly, the same shape appears in the runs without emission-line stratification, while star-forming and unclassified galaxies show weaker or less certain trends, and weak/strong AGN classes are too scarce and boundary-affected to support a claim. The authors also report that the photometric criteria they use are robust against bona fide AGN contamination, and that even within a volume-limited subsample the same qualitative trends survive.
Load-bearing premise
The claim stands or falls on the assumption that the adopted colour cuts, applied to k-corrected GALEX/SDSS photometry without correcting for each galaxy's own dust, correctly separate true UV upturn galaxies from UV weak ones at every redshift and mass, and that FUV detection does not selectively exclude red-sequence galaxies.
Editorial extensions
If this is right
- If the rising-with-mass trend is real, the UV upturn is more frequent in more massive quiescent galaxies, which points toward hot evolved stellar populations becoming more prominent in deep potential wells.
- The redshift peak near $z\approx0.20$–$0.25$ implies the occurrence rate of the UV upturn within UV-bright red-sequence galaxies changes over a lookback time of roughly 2.5–3 Gyr, so it is an evolutionary quantity, not a fixed galaxy property.
- The absence of a reliable trend for weak and strong AGN classes means the adopted UV classification is not being driven by AGN activity; any explanation of the UV upturn does not need an AGN component.
- The paper's fractions are likely underestimated, not overestimated, if internal extinction is corrected for, because more UV weak systems migrate into the UV upturn class than leave it.
Reading between the lines
- Beyond the paper, one testable extension is to replace stellar mass with central velocity dispersion in the same logistic model; if the mass trend is really about the depth of the potential well, the dispersion version should show a tighter or steeper relation than seen here.
- The redshift peak could partly reflect GALEX MIS depth and large UV k-corrections; a direct check is to repeat the analysis with a sample from the deeper GALEX DIS fields, where FUV detectability is higher at fixed $z$ and mass.
- The analysis only covers UV-bright red-sequence galaxies. The same Bayesian machinery applied to the full red sequence, including FUV non-detections modelled through survival analysis or a detection-probability term, would tell whether the reported trends hold for the whole quiescent population or only the UV-bright tail.
- If the in-fall after $z\approx0.25$ is physical, it would predict that the hot stellar populations responsible for the upturn were more common or hotter at lookback times of roughly 3 Gyr; a stellar-population synthesis model with an evolving fraction of extreme horizontal branch stars could be fit to the observed fractions to quantify that evolution.
Signed reviews
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper estimates the incidence of UV upturn among UV-bright red-sequence galaxies (RSGs) selected from GAMA-DR3 with GALEX MIS and SDSS photometry, using the Yi et al. (2011) colour criteria and WHAN emission-line classifications. A Bayesian logistic regression models the probability that a UV-bright RSG is classed as UV upturn as a quadratic function of redshift and stellar mass, with a second version stratified by emission-line class. The main claims are that the UV-upturn fraction rises with stellar mass, particularly for retired/passive systems, and that for retired/passive systems the fraction rises with redshift up to z ~ 0.20-0.25 and then declines.
Significance. If the trends are real, the paper provides a statistically framed measurement of how UV-upturn incidence depends on stellar mass and redshift among quiescent UV-bright galaxies, complementing cluster-based studies such as Ali et al. (2018c). The analysis is transparent in its use of public GAMA/GALEX/SDSS data, makes the statistical model explicit, and includes supplementary material: a volume-limited subsample and a discussion of internal-extinction effects. These strengths make the paper a potentially useful contribution to the study of evolved stellar populations in early-type galaxies. However, the central claims rest on the assumption that the FUV-detection-based sample is not biased by UV class in a redshift- or mass-dependent way, and this assumption is not tested; the paper itself also hedges the post-peak decline in Sec. 5.1 while asserting it clearly in the abstract and conclusions.
major comments (3)
- [§2.4, §5.1, Appendix C] The sample requires FUV detection in GALEX MIS, while the UV-upturn class is defined by bluer (FUV-NUV) and hence brighter FUV at fixed r and NUV. At higher redshift, the apparent FUV flux limit removes UV-weak galaxies preferentially, which would inflate the estimated UV-upturn fraction. Including log M* in the logistic regression does not correct for this because the selection is in FUV apparent magnitude, not in stellar mass. The volume-limited test in Appendix C cuts on M_r rather than absolute FUV magnitude, so it does not remove the bias. The paper should either model the FUV detection probability as a function of redshift, magnitude, and colour, or restrict the analysis to a region of absolute FUV magnitude where the sample is complete, and then re-fit the logistic model.
- [§5.1 versus Summary & Conclusions, point 5] There is an internal inconsistency about the post-peak redshift trend. Section 5.1 states that 'one cannot safely affirm whether the probability decreases, increases, or plateaus' after the peak, but the abstract and the conclusions state that an in-fall 'can be clearly seen'. The conclusions should be reworded to match the stated statistical uncertainty, or the authors should provide an additional test (e.g., a comparison of model evidence for a declining versus a plateauing trend) that supports the stronger claim.
- [Appendix A2.2, Eq. (A2)] Internal extinction is not corrected, and the paper's own estimate is that roughly 30 per cent of UV-weak systems would migrate to another UV class and about 6 per cent of UV-upturn systems would migrate out if extinction were accounted for. Since the UV class is the binary response variable in the logistic regression, this level of classification migration can directly change the fitted fraction surface. The paper does not show that the migration is symmetric in redshift and stellar mass; if it is not, the claimed mass and redshift trends could be partly driven by misclassification. A robustness test using extinction-corrected classifications, or explicitly propagating the classification uncertainty into the regression, is needed before the central trends can be considered secure.
minor comments (5)
- [§2.1] There is a typo: 'restrictions on the quality ofz measurements ware taken into account' should read 'were taken into account'.
- [§3.1] The text says the WHAN diagram 'segragates' galaxies into five groups; 'segregates' is meant.
- [§6.2] The phrase 'one must consider the a few issues' contains a stray article and should be edited.
- [Fig. 6 and Fig. 7] The bar charts display fractions without error bars or credible intervals. Given the small counts in the highest-redshift bins, adding Poisson or binomial error bars would help the reader judge the significance of the apparent trends.
- [Appendix C] The text says the volume-limited subsample shows 'very similar trends' to Figs. 9 and 10, but it would be useful to state explicitly whether the peak redshift and the mass-dependence slope are consistent within the credible intervals, rather than only visually similar.
Circularity Check
No significant circularity: the UV-upturn fraction is an externally defined photometric class regressed on redshift and stellar mass, and the reported trends are empirical fits rather than derivations from their own inputs.
full rationale
The paper is an observational statistical analysis, not a first-principles derivation. The response variable is defined by the external Yi et al. (2011) colour cuts applied to GALEX/SDSS photometry, and the predictors are redshift, stellar mass, and WHAN emission-line class. The Bayesian logistic regression is explicitly fitted to the observed sample to estimate the probability that a UV-bright red-sequence galaxy is classified as UV upturn; these estimates are then presented as trends, not as independent predictions. No equation defines the inputs in terms of the output, and the classification is not derived from the fitted fractions. The only self-citations (De Souza et al. 2015, 2016, 2017) are used for methodological motivation and for the interpretation of LINERs as weak AGN; they are not load-bearing for the central mass or redshift results, and no uniqueness theorem or ansatz is imported from the authors' prior work. The paper's own caveats about the FUV detection limit, internal extinction, and the widened credible intervals after the inferred peak (Sec. 5.1, Sec. 2.4, Appendix A2.2) are selection-systematic and robustness limitations, not circularity: they weaken external validity but do not make the fitted fractions equivalent to the inputs by construction. The volume-limited Appendix C check is a robustness test, not a prediction drawn from the same fitted parameters in a way that would force the conclusion. Therefore no self-definitional, fitted-input-as-prediction, or self-citation-chain reduction is present, and the derivation chain is self-contained relative to its stated empirical goal.
Assumptions & free parameters
free parameters (1)
- Logistic regression coefficients per class (intercept, log M*, log M*^2, z, z^2) =
Posterior values not tabulated
assumptions (7)
- domain assumption Yi et al. (2011) colour cuts classify UV upturn and UV weak galaxies reliably.
- domain assumption The GAMA/GALEX/SDSS matched sample, selected by FUV and NUV detection, is representative of UV-bright red-sequence galaxies.
- domain assumption GAMA k-corrections are accurate in the UV.
- domain assumption Internal extinction is small enough not to alter the conclusions.
- domain assumption Stellar masses from Taylor et al. (2011) are accurate and complete enough for the regression.
- ad hoc to paper Second-degree polynomial in z and log M* is the correct functional form.
- standard math Bernoulli/logistic regression with Normal(0,10) priors and HMC convergence is adequate.
Cite this review
Pith. "Pith review of UV bright red-sequence galaxies: how do UV upturn systems evolve in redshift and stellar mass?." pith.science (2026). https://pith.science/paper/6L6Z62QG
@misc{pith2026190806775,
author = {Pith},
title = {Pith review of: UV bright red-sequence galaxies: how do UV upturn systems evolve in redshift and stellar mass?},
year = {2026},
howpublished = {\url{https://pith.science/paper/6L6Z62QG}},
note = {Machine review of arXiv:1908.06775}
}
read the original abstract
The so-called ultraviolet (UV) upturn of elliptical galaxies is a phenomenon characterised by the up-rise of their fluxes in bluer wavelengths, typically in the 1,200-2,500A range. This work aims at estimating the rate of occurrence of the UV upturn over the entire red-sequence population of galaxies that show significant UV emission. This assessment is made considering it as function of three parameters: redshift, stellar mass, and -- what may seem counter-intuitive at first -- emission-line classification. We built a multiwavelength spectro-photometric catalogue from the Galaxy Mass Assembly survey, together with aperture-matched data from Galaxy Evolution Explorer Medium-Depth Imaging Survey (MIS) and Sloan Digital Sky Survey, covering the redshift range between 0.06 and 0.40. From this sample, we analyse the UV emission among UV bright galaxies, by selecting those that occupy the red-sequence locus in the (NUV-r) x (FUV-NUV) chart; then, we stratify the sample by their emission-line classes. To that end, we make use of emission-line diagnostic diagrams, focusing the analysis in retired/passive lineless galaxies. Then, a Bayesian logistic model was built to simultaneously deal with the effects of all galaxy properties (including emission-line classification or lack thereof). The main results show that retired/passive systems host an up-rise in the fraction of UV upturn or redshifts between 0.06 and 0.25, followed by an in-fall up to 0.35. Additionally, we show that the fraction of UV upturn hosts rises with increasing stellar mass.
Figures
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Reference graph
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