REVIEW 4 major objections 4 minor 133 references
Evidence for a thermal pressure deficit in galaxy groups from the tSZ effect and weak lensing
T0 review · 4 major / 4 minor · reviewed 2026-08-04 · deepseek-v4-flash
Pith's one-line read Current hydrodynamical simulations overpredict the thermal pressure of galaxy groups by roughly a factor of two, pointing to missing non-thermal pressure support or departures from hydrostatic equilibrium.
desk verdict Credible, carefully guarded evidence for a ~2x thermal pressure deficit at group masses, but the SED separation at 1.6' needs a broader dust/radio model before the headline is bulletproof. 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 central observable is the Compton y parameter, which is proportional to the line-of-sight integral of electron pressure (n_e T_e). The measurement pipeline uses compensated aperture photometry (CAP) to stack ACT single-channel temperature maps, and a multi-frequency SED model with three components—tSZ, a modified black-body dust emission (T_dust=24 K, beta=1.7), and a power-law radio component—to isolate the tSZ signal. For the simulation comparison, galaxy-galaxy lensing (GGL) profiles are used to select a sample of simulated galaxies that matches the observed halo mass distribution and satellite fraction, and the tSZ and GGL profiles are forward-modeled from the simulations, accounting
What would settle it
Measure the tSZ signal around the same DESI LRG sample with a CMB experiment that has more frequency channels (e.g., six channels from 30 to 280 GHz) and check whether the derived Compton y at 1.6' changes by more than the quoted statistical uncertainty; alternatively, obtain spatially resolved X-ray spectra of the same groups to directly measure gas temperature and non-thermal pressure, and see whether the observed temperature is indeed about half of the simulated prediction.
Extended reading notes
Core claim
The authors measure the tSZ effect around DESI LRGs using ACT single-channel maps, modeling the stacked SED as a combination of tSZ, dust, and radio emission, and compare the resulting Compton y profiles with forward-modeled predictions from the FLAMINGO simulations. After calibrating the simulated galaxy selection with galaxy-galaxy lensing, they find that the fiducial FLAMINGO simulation overpredicts the tSZ signal by roughly a factor of two or more across 10^13–10^14 Msun and z=0.4–1, and the strongest feedback variant, which best matches the kSZ-inferred gas density, still overpredicts it by about 2x at 1.6' apertures. The paper concludes that the deficit in thermal pressure cannot be ex
Load-bearing premise
The three-channel SED decomposition assumes the stacked signal is exactly tSZ plus a single modified-black-body dust component (T_dust=24 K, beta=1.7) plus a single power-law radio component; if the true dust or radio SEDs differ—especially flat-spectrum radio sources not detected by VLASS—the inferred Compton y, and thus the pressure deficit, could shift.
Editorial extensions
If this is right
- If the deficit is real, the thermal pressure of gas in galaxy groups is about half of what current simulations predict, so the gas is either supported by non-thermal pressure (turbulence, cosmic rays, magnetic fields) or is not in hydrostatic equilibrium.
- Additional gas depletion alone cannot resolve the discrepancy because the strongest feedback simulation already matches the kSZ-inferred gas density, so future simulation development must include additional physics rather than merely stronger feedback.
- The tSZ power spectrum at small scales is expected to be suppressed relative to simulation predictions, potentially explaining observed deficits at high multipoles.
- X-ray measurements of the same galaxy groups could directly test the predicted temperature deficit by measuring gas temperature and non-thermal pressure support.
- Mass calibration of groups and clusters using X-ray or SZ observables may be biased if non-thermal pressure support is significant and unaccounted for in hydrostatic equilibrium analyses.
Reading between the lines
- If non-thermal pressure support is the cause, this would affect not only group gas fractions but also cluster mass calibration and the interpretation of cluster counts and tSZ power spectrum measurements in cosmological analyses.
- The galaxy-informed SED modeling approach used here could be extended to other galaxy samples and redshift ranges, especially with upcoming multi-frequency CMB experiments (e.g., Simons Observatory) that can better break the tSZ-dust-radio degeneracy.
- The factor-of-two temperature overprediction in simulations may also imply that the gas in groups is more multiphase or clumpy than simulated, or that the energy injection from feedback is more efficiently converted into non-thermal forms than currently modeled.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper presents new stacked thermal Sunyaev-Zel'dovich (tSZ) measurements around DESI photometric LRGs using ACT DR6 single-channel maps, together with galaxy-galaxy lensing (GGL) measurements from HSC. The authors model the stacked 90/150/220 GHz photometry as tSZ plus dust plus radio emission, and compare the inferred Compton-y signal with forward-modeled predictions from the FLAMINGO simulations, with simulated galaxy selections calibrated to match the observed GGL profiles. The central claim is that current hydrodynamical simulations overpredict the tSZ signal of group-mass halos by roughly a factor of two at apertures ≲3′, and that even the strongest-feedback FLAMINGO variant, which reproduces the kSZ-inferred gas density, still overpredicts the thermal pressure. The authors interpret this as evidence for missing non-thermal pressure support or significant departures from hydrostatic equilibrium in the simulations.
Significance. If the central result holds, this is a significant step toward a coherent observational picture of the thermodynamic state of gas in galaxy groups: it combines a new foreground-modeled tSZ measurement with GGL-calibrated simulation comparisons, and it connects the tSZ deficit to the existing kSZ-based evidence for gas depletion. The paper is careful in several respects: the tSZ signal is isolated via galaxy-informed SED modeling rather than blind map-level component separation; the simulation comparison is like-with-like, forward-modeling miscentering, satellites, masking, and two-halo contributions; and many robustness tests are reported (free β, radio omitted, VLASS prior, cluster-mask variants, extreme simulation selections). The authors also make conservative choices, e.g., focusing on the upper end of the Compton-y posterior and using a stricter cluster mask in the simulations. These strengths make the claimed deficit credible within the adopted model family. However, as detailed below, the central claim depends on the assumed dust/radio SED family being sufficiently broad, and the paper does not yet provide a fully quantitative significance for the factor-of-two deficit.
major comments (4)
- [§3.3, Fig. 4, Appendix B] The load-bearing SED separation is underdetermined: three ACT channels are fit with four free parameters (log10 y, log10 A_dust, log10 A_radio, α) plus fixed T_dust=24 K and β=1.7. The robustness tests in Appendix B vary β with T fixed, omit radio, or add a VLASS prior, but they do not jointly vary T_dust and β, include a second dust temperature component, or add a flat-spectrum radio population. Since dust contributes >60% of the 150 GHz signal in the lowest-mass bin (Fig. 4), the posterior upper envelope of y—which the paper deliberately adopts—may be set by the fixed SED family rather than by the data. Warmer dust or flat-spectrum radio below the VLASS threshold could partially fill the tSZ decrement and raise the allowed y, shrinking the claimed factor-of-two deficit. Please quantify this: e.g., fit with T_dust in a physically plausible range (say 20–40 K) with β free, and/or with an
- [§5, Fig. 6] The central claim is that the strongest-feedback FLAMINGO simulation overpredicts the observed tSZ signal by about a factor of two, yet the paper refrains from quoting a formal significance. Because the statement is the headline result, the manuscript should provide a quantitative summary of the deficit—e.g., per-bin posterior distributions of y_data/y_sim, a combined probability that y_data < y_sim, and an explicit accounting of the systematic contributions (SED, GGL mass calibration, cluster masking) that dominate over statistical errors. Currently the reader cannot assess whether the factor of two is a 2σ effect or a 10σ effect, nor how the systematic uncertainties are folded into the claim.
- [§4.3, Appendix D] It is not fully clear whether the GGL measurements and the tSZ stacking are performed on the same galaxy samples. GGL uses HSC Y3, whose footprint is smaller than the ACT-DESI overlap; the tSZ stacking appears to use the full ACT-DESI overlap. If the GGL-calibrated simulation selection is derived from a subset of galaxies that differs from the tSZ sample (e.g., in stellar mass distribution, depth, or environment), the like-with-like comparison could be biased. Please state explicitly whether the tSZ analysis is restricted to the HSC overlap for the GGL-calibrated bins, or demonstrate that sample differences between the footprints are negligible for the tSZ signal.
- [§6.1] The interpretation that the tSZ deficit reflects an overpredicted gas temperature (rather than gas density) relies on the external kSZ result that the strongest-feedback FLAMINGO simulation reproduces the gas density of the same galaxy sample. The paper should propagate the uncertainty of this kSZ anchor into the temperature-deficit claim. For example, if the kSZ normalization is uncertain at the 10–20% level, does this change the required non-thermal pressure fraction? A quantitative propagation would strengthen the physical conclusion and separate it from the robust-but-less-interpreted statement that simulations overpredict tSZ.
minor comments (4)
- [§3.2] The sentence 'We therefore fix T_dust = 24 K throughout this work, without loss of model flexibility' is too strong: β and T_dust are degenerate but not perfectly so, and the Appendix B results show that the inferred y can shift when the dust model is changed. Please rephrase to 'without substantial loss of model flexibility within the adopted dust family' or similar.
- [Fig. 3 / Fig. 5] The gray bands for the CIB+dβ deprojected maps are described in the caption but are visually dense and sometimes confused with statistical error bars. Consider labeling the band directly in the figure or using a hatched region, and clarify in the caption that the band spans the range of assumed dust SEDs, not a statistical uncertainty.
- [General] There is no explicit data/code availability statement. Given the reproducibility value of the SED-fitting and forward-modeling pipeline, please add one (or state that code will be released upon acceptance).
- [§4.4] The notation 'f_gas −8σ' is used without defining whether σ is the observational uncertainty on the mean gas fraction relation. It is clear later, but a one-line definition at first use would help.
Circularity Check
No significant circularity: the tSZ measurement and the GGL-calibrated simulation predictions are independent, and the kSZ anchor rests on external observational results.
full rationale
I walked the paper's derivation chain and found no step where a prediction reduces, by definition or by fitting, to its own input. The tSZ measurement (Section 3.3) treats Compton y as a free parameter in a three-component SED fit to ACT photometry; y is not derived from the simulations. The fit is acknowledged to be degenerate (Section 3.3), but the paper conservatively adopts the upper end of the y posterior and demonstrates robustness in Appendix B to freeing beta, omitting radio, and imposing VLASS priors. This is an ordinary fitting degeneracy, not circularity. The GGL calibration (Section 4.4) selects simulated galaxies by matching an independent observable (lensing) and then forward-predicts a different observable (tSZ); the strong mass scaling of tSZ does not make this circular. The interpretation step (Section 6.1) uses the prior kSZ result that the strongest-feedback FLAMINGO simulation reproduces the observed gas density. That claim is supported by citations to overlapping authors, but the underlying kSZ measurements are external DESI+ACT data, and the FLAMINGO comparison is a forward model, not a fit to the present tSZ measurement. The factor-of-two thermal-pressure deficit is therefore a comparison of an independently measured y with forward-modeled simulation predictions, not an identity. The residual concern is that the SED family (fixed T_dust = 24 K, beta = 1.7) may not be exhaustive, which is a systematic uncertainty, not a circular step.
Assumptions & free parameters
free parameters (8)
- Dust temperature T_dust =
24 K (fixed)
- Dust spectral index β =
1.7 ± 0.5
- Radio spectral index α =
uniform prior [-2, 0], posterior constrained
- Dust and radio amplitudes A_dust, A_radio =
per sample and radial bin
- Compton y amplitude (log10 y) =
posteriors per sample and radial bin
- Log-normal stellar-mass center M0 =
optimized to GGL per sample
- Stellar-mass width σ =
0.2 dex (fixed)
- Cluster masking threshold M500,max =
10^14.3 Msun (fixed)
assumptions (7)
- standard math Non-relativistic tSZ spectral shape with negligible relativistic corrections
- domain assumption Dust emission of LRGs is a single modified blackbody with T_dust = 24 K and β = 1.7
- domain assumption Background-subtracted aperture photometry removes all uncorrelated line-of-sight CIB and radio emission
- domain assumption The GGL-calibrated log-normal stellar-mass selection with σ = 0.2 dex reproduces the true halo mass distribution of DESI LRGs
- domain assumption FLAMINGO simulations are representative of 'current hydrodynamical simulations' for thermal pressure
- domain assumption The kSZ-inferred gas density, which the fgas -8σ run reproduces, is accurate
- domain assumption Hydrostatic equilibrium is a reasonable starting assumption when interpreting the deficit as missing non-thermal pressure
Cite this review
Pith. "Pith review of Evidence for a thermal pressure deficit in galaxy groups from the tSZ effect and weak lensing." pith.science (2026). https://pith.science/paper/CUKG2HXO
@misc{pith2026260800164,
author = {Pith},
title = {Pith review of: Evidence for a thermal pressure deficit in galaxy groups from the tSZ effect and weak lensing},
year = {2026},
howpublished = {\url{https://pith.science/paper/CUKG2HXO}},
note = {Machine review of arXiv:2608.00164}
}
abstract
Measurements of the thermal Sunyaev-Zel'dovich (tSZ) effect have yet to form a consistent picture of the thermodynamic state of the gas in the intracluster medium: their interpretation is complicated by foreground contamination and uncertain halo masses. We present new measurements of the tSZ effect around the Dark Energy Spectroscopic Instrument (DESI) Luminous Red Galaxy (LRG) sample, together with galaxy-galaxy lensing (GGL) measurements that enable a like-with-like comparison to state-of-the-art hydrodynamical simulations. We robustly isolate the tSZ signal by directly modeling the dust and radio emission of the target galaxies using the Atacama Cosmology Telescope (ACT) single-channel temperature maps, substantially reducing uncertainties from astrophysical foregrounds. Across halo masses $M_{500}=10^{13}-10^{14}~M_\odot$ and redshifts $0.4<z<1$, we find that the fiducial 1 Gpc$^3$ FLAMINGO simulation significantly overpredicts the observed tSZ signal at $\lesssim3'$ (i.e., $\lesssim 4\,R_{500}$ at $z=0.7$). Even the simulation with the strongest gas expulsion---which successfully reproduces the gas density inferred from kinetic SZ measurements of the same galaxy sample---overpredicts the thermal pressure. Because the strongest feedback model already reproduces the observed gas density, the remaining discrepancy is difficult to explain with additional gas depletion alone. Instead, current hydrodynamical simulations appear to overpredict the thermal pressure of galaxy groups by a factor of two, pointing toward missing non-thermal pressure support or significant departures from hydrostatic equilibrium.
Figures
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Reference graph
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