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The hot circumgalactic medium in the eROSITA All-Sky Survey III. Star-forming and quiescent galaxies

T0 review · 4 major / 6 minor · reviewed 2026-08-12 · deepseek-v4-flash

Pith's one-line read Stacking X-ray light around tens of thousands of SDSS central galaxies, this paper argues that star-forming galaxies do not host brighter hot circumgalactic medium than quiescent galaxies of equal stellar or halo mass.

desk verdict Solid eRASS:4 stacking paper whose robust result—star-forming centrals are not X-ray brighter at fixed mass—survives; the stronger halo-mass equality is explicitly conditional on the bimodal SHMR, and the paper is honest about that. read the letter →

arxiv 2411.19945 v1 pith:QGA6XWZG submitted 2024-11-29 astro-ph.GA hep-ph

classification astro-ph.GAhep-ph
keywords circumgalacticmediumhotgasX-raystackingstar-forminggalaxiesquiescentstellar-to-halomassrelationeROSITAgalaxyquenching
topics Dark Matter
open problems Dark Matter
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper asks whether the hot gas halo around a galaxy knows whether the galaxy is forming stars. Using stacked X-ray images from the first four eROSITA all-sky surveys around roughly 85,000 central galaxies from SDSS DR7, the authors measure soft X-ray emission from the circumgalactic medium (CGM) separately for star-forming and quiescent galaxies, selected in both stellar mass and halo mass. They find that at fixed stellar mass above $\log(M_*/\mathrm{M}_\odot) \simeq 11.0$, quiescent galaxies host brighter hot CGM, but at fixed halo mass above $\log(M_{200m}/\mathrm{M}_\odot) \simeq 12.5$ the two populations look the same. Their headline conclusion is that star-forming galaxies never host brighter hot CGM than quiescent galaxies of the same mass, and that halo mass, rather than the current star-formation state, appears to set how much X-ray light the CGM emits. This matters because feedback from star formation and active galactic nuclei is often invoked to heat and expel CGM gas and shut down star formation; the result constrains how strong such feedback can be.

What carries the argument

The machine is the stacked X-ray surface brightness profile: events from the first four eROSITA all-sky surveys are co-added in radial bins around SDSS DR7 central galaxies, with detected point sources masked and unresolved active galactic nuclei plus X-ray binaries modeled and subtracted, so the remaining soft X-ray emission is attributed to the hot CGM. The profiles are fit with a $\beta$-model, and $L_{X,\rm CGM}$ is the integral within $R_{500c}$. The comparison that carries the argument is between two selections of the same sample: bins in stellar mass $M_*$, where quiescent systems above $\log(M_*/\mathrm{M}_\odot) = 11.0$ are brighter, and bins in halo mass $M_{200m}$ from the Tinker (2021) group finder, where star-forming and quiescent profiles are consistent; the bimodal stellar-to-halo mass relation is what converts one selection into the other, and the paper shows that switching to the unimodal Yang et al. (2007) SHMR destroys the halo-mass equality.

What would settle it

Re-run the stacking using halo masses derived from a weak-lensing-calibrated stellar-to-halo mass relation; if the $L_{X,\rm CGM}$–$M_{500c}$ relations for star-forming and quiescent galaxies separate, the paper's equal-brightness halo-mass claim is refuted.

Watch

Extended reading notes

Core claim

The central claim is that the hot CGM X-ray luminosity of central galaxies is set by halo mass, not by whether the galaxy is star-forming or quiescent. Concretely, the stacked 0.5–2 keV emission within $R_{500c}$ gives $L_{X,\rm CGM} \approx 8\times 10^{39}$, $2.3\times 10^{40}$, and $4.0\times 10^{40}$ erg/s for star-forming galaxies with median stellar masses $\log(M_*/\mathrm{M}_\odot) = 10.7$, $11.1$, and $11.3$, and $1.1\times 10^{40}$, $6.2\times 10^{40}$, and $3.0\times 10^{41}$ erg/s for quiescent galaxies with median stellar masses $10.8$, $11.1$, and $11.4$; quiescent systems are brighter above $\log(M_*/\mathrm{M}_\odot) > 11.0$. When the same galaxies are binned by halo mass using the Tinker (2021) group finder, star-forming and quiescent galaxies with $\log(M_{200m}/\mathrm{M}_\odot) > 12.5$ show consistent surface brightness profiles and consistent $L_{X,\rm CGM}$–$M_{500c}$ relations, implying that galaxies in similar dark matter halos host equally bright hot CGM. The paper states that this halo-mass conclusion is conditional on the bimodal stellar-to-halo mass relation, because repeating the halo-mass selection with the unimodal Yang et al. (2007) SHMR produces different $L_{X,\rm CGM}$–$M_{500c}$ relations; the SHMR-independent statement that survives is the title conclusion that star-forming galaxies are not brighter.

Load-bearing premise

The conclusion that star-forming and quiescent galaxies in matched halos shine equally bright assumes that the halo masses assigned by the Tinker (2021) group finder, with its two-branch stellar-to-halo mass relation, are the true halo masses.

Editorial extensions

If this is right

  • Quiescent galaxies with $\log(M_*/\mathrm{M}_\odot) > 11.0$ appear brighter in hot CGM X-ray emission than star-forming galaxies of the same stellar mass, while below that mass the two are comparable.
  • Binned by halo mass with the Tinker (2021) group finder, star-forming and quiescent central galaxies above $\log(M_{200m}/\mathrm{M}_\odot) \simeq 12.5$ show consistent X-ray surface brightness and luminosity, so halo mass, not star-formation state, is the primary driver of CGM heating.
  • If the bimodal stellar-to-halo mass relation is replaced by a unimodal one, the equal-brightness halo-mass result disappears and star-forming galaxies appear fainter than quiescent ones, so future SHMR measurements will either support or overturn the halo-mass interpretation.
  • Comparisons with three cosmological hydrodynamical simulations show disagreement in some mass bins, so the measured relations provide a constraint on how much energy feedback can deposit in or remove from the hot CGM.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If the equal-brightness result holds, it suggests quenching is not accompanied by an unusually hot or luminous CGM; the gas reservoir looks the same whether star formation is ongoing or shut off, which points toward halo mass or assembly history as the quenching switch.
  • The strong SHMR dependence implies that the cleanest test will come from weak-lensing-calibrated halo masses; the same stacking repeated with those masses would either confirm or dissolve the halo-mass conclusion.
  • The paper's identification of satellite-boost bias and star contamination as the source of earlier conflicting results suggests that other stacked CGM measurements built from less clean central samples may need to be revisited.
  • Measuring CGM temperature or metallicity from stacked spectra, rather than luminosity alone, would test whether the gas around star-forming and quiescent galaxies is in the same physical state even when its X-ray brightness matches.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

4 major / 6 minor

Summary. The paper stacks four eROSITA all-sky survey (eRASS:4) maps around volume-limited samples of ~32,000 central star-forming and ~53,000 central quiescent SDSS DR7 galaxies, plus the corresponding halo-mass-selected samples, at zspec < 0.2. It measures mean 0.5–2 keV X-ray surface brightness profiles out to R500c, subtracts detected point sources, unresolved AGN, X-ray binaries, and satellite contributions, and integrates the residual as LX,CGM. It reports extended hot CGM emission around quiescent galaxies with log M* > 10.5 and star-forming galaxies with log M* > 11.0, a bifurcation in the LX,CGM–M* scaling relation above log M* ~ 11.0, and consistent LX,CGM–M500c relations for star-forming and quiescent galaxies when using the Tinker (2021) group finder's bimodal SHMR. The paper shows that this halo-mass equality is not reproduced when halo masses are assigned with the Yang et al. (2007) group finder. It compares the measured relations to EAGLE, TNG100, and SIMBA and discusses discrepancies with the earlier eFEDS stacking studies. The concluding claim is that, whether selected in stellar mass or halo mass, star-forming galaxies do not host brighter stacked X-ray emission from the hot CGM than their quiescent counterparts at the same mass.

Significance. If the main result holds, it suggests that hot CGM X-ray luminosity is not enhanced by ongoing star formation at fixed stellar or halo mass and that halo mass, rather than current star formation state, is the primary determinant of CGM heating — a useful constraint for quenching models and their feedback implementations. The paper's strengths include large central-galaxy samples, careful masking and modeling of unresolved AGN/XRB emission, an explicit test of the SHMR dependence, and a transparent statement that the halo-mass equality is conditional on the adopted bimodal SHMR. The robust part of the conclusion (star-forming galaxies are not brighter) is well supported, but the stronger equality claim is only established under one particular SHMR, and the star-forming CGM detections are marginal in several bins.

major comments (4)
  1. [Section 4.1, Fig. 5] The abstract and the fourth bullet of Section 5 state that galaxies in the same mass dark matter halos host equally bright hot CGM and that halo mass is the determining factor; this is only true for the Tinker (2021) bimodal SHMR. The paper's own test with the Yang et al. (2007) group finder yields LX,CGM-M500c relations in which star-forming galaxies are fainter than quiescent galaxies, and the text concludes that the consistent relations are 'conditional upon the bimodal SHMR'. The abstract and conclusions should be revised to present the equality as an SHMR-dependent result and to separate it from the robust statement that star-forming galaxies are not brighter.
  2. [Table 3, Sections 3.1 and 3.2] The star-forming LX,CGM values are low-significance detections, e.g., 2.3±1.5×10^40 erg/s in the log M*=11.0-11.25 bin and 4.0±2.4×10^40 erg/s in the 11.25-11.5 bin, corresponding to roughly 1.5-2 sigma. The claim that extended X-ray emission from the hot CGM is 'detected' around star-forming galaxies with log M*>11.0 is not supported at high confidence by the integrated luminosities. The later statement that star-forming and quiescent galaxies host 'equally bright' CGM in halo mass bins should be reframed as consistency within large uncertainties or as an upper limit for the star-forming population.
  3. [Section 4.2, Fig. 7] The simulation comparison mixes apertures: simulated LX,CGM is measured within (0.15-1)R500c, while the observed LX,CGM is integrated within the full R500c. The paper acknowledges the 'face value' nature of the comparison, but it does not quantify the resulting bias. A matched-aperture measurement or an explicit aperture correction is needed before the degree of agreement with EAGLE, TNG100, and SIMBA can be assessed.
  4. [Section 3.1, Table 3, Appendix A] For star-forming galaxies, the modeled XRB plus unresolved AGN emission is comparable to or larger than the residual LX,CGM (e.g., 2.6±1.1 versus 2.3±1.5 ×10^40 erg/s in the 11.0-11.25 stellar mass bin). The paper notes that proper beta-model fits cannot be applied to star-forming galaxies because of this, but the systematic uncertainty of the Aird et al. (2017) XRB model and of the BPT-based AGN estimate is not propagated into LX,CGM. A quantitative assessment of these systematics is required for the detection claim.
minor comments (6)
  1. [Table 1, Section 2.1] The total sample sizes quoted in the text (32,190 CENSF and 53,032 CENQU) differ from the sums of the corresponding Table 1 bins (31,243 and 52,130, respectively); please verify and make the numbers consistent.
  2. [Equations (1)-(2)] The summation symbol appears to be missing in the rendered equations; the equations should be written with explicit sums over events and radial bins.
  3. [Abstract] The sequences '0.8, 2.3, 4.0×10^40' and '1.1, 6.2, 30×10^40' should be written with the same scientific notation for each value for clarity.
  4. [Section 4.4.1, Fig. 9] The statement that 'a satellite fraction of about 40-50% can explain the bright LX' is imprecise because Fig. 9 labels the quantities as lower limits ('fsat > 40%' and 'fsat > 50%'); please clarify whether these are lower limits.
  5. [Figures 2 and 3] The captions contain a typo ('bottem'), and they should specify whether the shown SX,CGM profiles already have the unresolved AGN and XRB models subtracted when comparing with the beta-model fits.
  6. [Section 4.2, Fig. 7] The simulated uncertainties are the 16-84% scatter of individual simulated galaxies, while the observed uncertainties are errors on the mean; this difference should be stated in the figure captions as well as in the text.

Circularity Check

0 steps flagged · score 1.0 of 10

No significant circularity: the X-ray luminosities are directly measured from stacked eRASS:4 data; the halo-mass comparison is explicitly conditional on the adopted SHMR and is tested against an alternative, not derived from its own inputs.

full rationale

The paper's central measurements are stacked X-ray surface brightness profiles and integrated LX,CGM values (Sect. 2.2, Eqs. 1-3), obtained by masking point sources and subtracting AGN/XRB/satellite models. These luminosities are not fitted from, nor defined in terms of, the halo masses used to bin the samples. The halo-mass scaling relations come from the Tinker (2021) group finder, which is calibrated to galaxy clustering and galaxy-galaxy lensing (Mandelbaum et al. 2016), not to X-ray data; this is an external assumption, not an internal reduction. The paper explicitly flags the limitation: 'We conclude that the consistent LX,CGM-M500c scaling relations for star-forming and quiescent galaxies (Fig. 3) are conditional upon the bimodal SHMR' (Sect. 4.1), and it tests the Yang et al. (2007) unimodal SHMR, finding different LX,CGM-M500c relations (Fig. 5), while the weaker claim that star-forming galaxies are not brighter survives. The 'derived' LX,CGM-M500c and LX,CGM-M* curves in Figs. 5-6 are consistency checks obtained by convolving the independently measured LX,CGM-M* or LX,CGM-M500c relations with the respective SHMRs; they are presented as checks, not as the source of the data. The comparison to EAGLE, TNG100 and SIMBA uses external simulations and is made 'at face value' with stated limitations. Self-citations to Zhang et al. (2024a,b) supply the stacking pipeline, background treatment and contamination models for the companion analysis; these are methodological dependencies, not a circular import of the SF/QU conclusion, which was not present in those works. No equation in the paper reduces to its own input, and no fitted parameter is renamed as a prediction. Therefore the derivation chain is self-contained with respect to circularity.

Assumptions & free parameters 2 free parameters · 5 assumptions · 0 invented entities

The central measurement is an integrated X-ray luminosity from stacked profiles, so the main free parameters are the background level and beta-model descriptions. The main assumptions are observational: the background is the minimum beyond R500c, XRB and unresolved AGN follow literature models, the Tinker (2021) group finder recovers the bimodal SHMR, satellite contamination is captured by Paper I mocks, and simulation comparisons need no mock. No invented entities are introduced.

free parameters (2)
  • Background level S_X,bg = minimum S_X beyond R500c per stack
    Chosen per stacked sample as the zero level; directly sets LX,CGM and the SF/QU comparison.
  • Beta model parameters (beta, log S_X0, r_c) = beta 0.35-0.5; log S_X0 36.8-37.7; r_c 1-18 kpc
    MCMC fits to quiescent and one SF halo profile in Table 2. Descriptive only and not used to compute LX,CGM, but quoted as profile shape results.
assumptions (5)
  • domain assumption The X-ray background can be estimated as the minimum surface brightness beyond R500c.
    Section 2.2; assumes negligible CGM emission beyond R500c. Over-subtraction would bias LX,CGM low.
  • domain assumption XRB luminosity follows Aird et al. (2017) scaling with SFR and M*, and unresolved AGN luminosity follows the stacked BPT-selected AGN sample scaled by fAGN.
    Section 2.2 and Appendix A; subtraction of these components dominates the star-forming CGM measurement.
  • domain assumption Halo masses from Tinker (2021) and its bimodal stellar-to-halo mass relation are correct, with M200m to M500c converted using Ishiyama et al. (2021).
    Section 4.1; the equal-LX halo-mass result changes if a unimodal SHMR such as Yang et al. (2007) is adopted.
  • domain assumption Satellite contamination and central misclassification rates (about 2% and 1%) from Paper I mock catalogs are accurate.
    Section 2.1 and 2.2; satellite X-ray boost could bias the stacked central galaxy profiles.
  • domain assumption Simulation comparisons can be made at face value without a dedicated mock catalog reproducing selection, mass functions, and SHMR.
    Section 4.2; the authors state this limitation explicitly, so the comparison is indicative rather than fully controlled.

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Cite this review

Pith. "Pith review of The hot circumgalactic medium in the eROSITA All-Sky Survey III. Star-forming and quiescent galaxies." pith.science (2026). https://pith.science/paper/QGA6XWZG

@misc{pith2026241119945,
  author       = {Pith},
  title        = {Pith review of: The hot circumgalactic medium in the eROSITA All-Sky Survey III. Star-forming and quiescent galaxies},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/QGA6XWZG}},
  note         = {Machine review of arXiv:2411.19945}
}
abstract

The circumgalactic medium (CGM), as the gas repository for star formation, might contain the answer to the mysterious galaxy quenching and bimodal galaxy population origin. We measured the X-ray emission of the hot CGM around star-forming and quiescent galaxies. We detect extended X-ray emission from the hot CGM around star-forming galaxies with $\log(M_*/M_\odot)>11.0$ and quiescent galaxies with $\log(M_*/M_\odot)>10.5$, extending out to $R_{\rm 500c}$. $L_{\rm X, CGM}$ of star-forming galaxies with median stellar masses $\log(M_{\rm *,med}/M_\odot) = 10.7, 11.1, 11.3$ are approximately $0.8\,, 2.3\,, 4.0 \times 10^{40}\,\rm erg/s$, while for quiescent galaxies with $\log(M_{\rm *,med}/M_\odot) = 10.8, 11.1, 11.4$, they are $1.1\,, 6.2\,, 30 \times 10^{40}\,\rm erg/s$. Notably, quiescent galaxies with $\log(M_{\rm *,med}/M_\odot) > 11.0$ exhibit brighter hot CGM than their star-forming counterparts. In halo mass bins, we detect similar X-ray emission around star-forming and quiescent galaxies with $\log(M_{\rm 200m}/M_\odot) > 12.5$, suggesting that galaxies in the same mass dark matter halos host equally bright hot CGM. We emphasize the observed $L_{\rm X, CGM} - M_{\rm 500c}$ relations of star-forming and quiescent galaxies are sensitive to the stellar-to-halo mass relation (SHMR). A comparison with cosmological hydrodynamical simulations (EAGLE, TNG100, and SIMBA) reveals varying degrees of agreement, contingent on the simulation and the specific stellar or halo mass ranges considered. Either selected in stellar mass or halo mass, the star-forming galaxies do not host brighter stacked X-ray emission from the hot CGM than their quiescent counterparts at the same mass range. The result provides useful constraints on the extent of feedback's impacts as a mechanism for quenching star formation as implemented in current cosmological simulations.

Figures

Figures reproduced from arXiv: 2411.19945 by the authors.

Figure 1
Figure 1. The median M200m and median M∗ of galaxies with the 16−84% scatter for each mass bin in the CENhalo,SF (blue band), CENhalo,QU (red band), CENSF (green crosses), and CENQU (or￾ange cross) samples. We build the galaxy samples based on the SDSS DR7 spec￾troscopic galaxy catalog (rAB < 17.77) (Strauss et al. 2002). We take the spectroscopic redshift (zspec) estimated by Blan￾ton et al. (2005), stellar mass estimated by… view at source ↗
Figure 2
Figure 2. X-ray surface brightness profiles of the hot CGM of the central star-forming ( [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. X-ray surface brightness profiles of the hot CGM of the central star-forming ( [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figures from the paper (6 more)
Figure 4
Figure 4. Figure 4: Comparison of M500c − M∗ relations of central star￾forming (top) and quiescent (bottom) galaxies in catalog Tin￾ker (2021) and Yang et al. (2007), and EAGLE, TNG100 and SIMBA simulations. The shadow area denotes the 16–84% scat￾ter of the relation. Yang et al. (2007) o…
Figure 5
Figure 5. Figure 5: Observed hot CGM X-ray luminosity of central star [PITH_FULL_IMAGE:figures/full_fig_p009_5.png]
Figure 6
Figure 6. Figure 6: Observed LX,CGM,SF− M∗ (blue) and LX,CGM,QU − M∗ (red) scaling relations, compared to the derived ones by convolving LX,CGM − M500c with SHMR of Tinker (2021). We compare the LX,CGM − M500c relations predicted by the simulations to the observation based on halo mass pr…
Figure 7
Figure 7. Figure 7: Comparison of the observed LX,CGM − M∗ relation to the predictions from the EAGLE, TNG100, and SIMBA simulations with 1σ uncertainties, for star-forming (top left) and quiescent (top right) galaxies. Comparison of the observed LX,CGM − M500c relation to the predictions…
Figure 8
Figure 8. Figure 8: Comparison the LX,CGM − M∗ relations of star-forming and quiescent galaxies selected by 4000Å break or sSFR. and integrate the X-ray emission within 300 kpc around galax￾ies. We obtain much lower LX,<300kpc of quiescent galaxies than Comparat et al. (2022). Except for …
Figure 9
Figure 9. Figure 9: X-ray luminosity within 300 kpc, without masking extended X-ray sources, for quiescent (top left) and star-forming (bottom [PITH_FULL_IMAGE:figures/full_fig_p012_9.png]

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Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. What's Missing in AGN Feedback? Lessons learnt from Magneticum, IllustrisTNG and Simba

    astro-ph.GA 2026-07 conditional novelty 6.0 of 10

    No current simulation simultaneously reproduces observed halo hot-gas fractions and local galaxy star-formation/quenching demographics; strong AGN feedback overquenches, weak feedback retains too much gas.

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