REVIEW 4 major objections 6 minor 7 cited by
Stellar Mass-Dispersion Measure Correlations Constrain Baryonic Feedback in Fast Radio Burst Host Galaxies
T0 review · 4 major / 6 minor · reviewed 2026-08-06 · deepseek-v4-flash
Pith's one-line read In a sample of 20 nearby fast radio bursts, host-galaxy dispersion measure decreases with stellar mass at $m=-97\pm44\,\mathrm{pc\,cm^{-3}}$ per dex, putting the weak-feedback CAMELS-Astrid prediction into $4.2\sigma$ tension.
desk verdict A careful first measurement of the host DM–stellar mass relation from 20 low-z FRBs, with an honest but conditional case against weak feedback that hinges on an unmeasured ISM slope. 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 object is the Macquart estimator $\mathrm{DM}_{\rm host}^{\rm Macquart}$, the remainder after subtracting the Milky Way ISM/CGM and the mean cosmic DM from the observed FRB DM; it contains host ISM, CBM, and CGM contributions. The carrying mechanism is a comparison of this observed quantity with $\mathrm{DM}_{\rm h,CGM}$ predicted by ray-tracing through CAMELS simulation snapshots with gas within $0.1 R_{200,\rm crit}$ removed. Both are fit with a quadratic in $\log_{10}(M_*/10^{10}M_\odot)$ with constant scatter, and the slope parameter $m$ is the discriminating statistic that carries the argument.
What would settle it
Measure the ISM and circum-burst dispersion measure directly across stellar mass, for example by comparing H$\alpha$ emission-measure-inferred DM with stellar mass in the same FRB hosts, and check whether the ISM slope is positive, as the paper's argument requires, or negative. If an ISM slope near $-180\,\mathrm{pc\,cm^{-3}/dex}$ appeared, the tension with weak-feedback simulations would vanish; if the ISM slope is positive, the tension strengthens.
Extended reading notes
Core claim
The paper claims to have measured the stellar-mass dependence of host-galaxy DM for low-redshift FRBs: heavier hosts have lower host DM, with best-fit slope $m = -97 \pm 44\,\mathrm{pc\,cm^{-3}}$ per dex over $10^9\!-\!10^{11}M_\odot$ at $z<0.2$. It further claims that the positive CGM slope predicted by the fiducial Astrid model, $m_{\rm Astrid}=84\pm7$, conflicts with this at $4.2\sigma$, so the only way to save that model is a large negative ISM contribution of about $-180\,\mathrm{pc\,cm^{-3}/dex}$. Because ISM tracers (H$\alpha$-inferred DM and HI mass) correlate positively with stellar mass, the paper concludes that weak-feedback models are disfavored and that baryonic feedback in isolated $\sim L_*$ halos in the local Universe must be stronger than Astrid implements.
Load-bearing premise
The conclusion stands on the assumption that the host galaxy's own disk gas and the plasma immediately around the burst do not have a steeply negative dispersion-measure\textendash{}mass slope; if they do, the $4.2\sigma$ tension with weak-feedback models disappears.
Editorial extensions
If this is right
- The fiducial CAMELS-Astrid prediction of a positive CGM slope $m=84\pm7$ is discrepant with the measured $m=-97\pm44$ at $4.2\sigma$, so CGM-driven positive correlations between stellar mass and host DM are disfavored.
- Reconciling any of the three simulations with the data requires a host ISM and circum-burst contribution whose DM slope with stellar mass is negative, near $-100$ to $-180\,\mathrm{pc\,cm^{-3}/dex}$, a requirement the paper argues is potentially unphysical.
- If the data are right, baryonic feedback in isolated $\sim L_*$ halos at $z<0.2$ must be stronger than the fiducial Astrid implementation, placing an indirect upper limit on the matter-power-spectrum suppression factor $S(k,z=0)$ from such halos.
- The negative slope is robust to changing the cosmic DM scatter prescription, the FRB offset distribution, association probability cuts, and removal of the most influential data point; it remains negative in all these variants.
Reading between the lines
- If the host ISM truly has a positive DM\textendash{}stellar-mass slope, as H$\alpha$ data suggest, then the observed negative slope implies the CGM DM in massive hosts must be suppressed even more strongly than the total anti-correlation alone, pushing the inferred feedback strength upward.
- The same $M_*$\textendash{}DM$_{\rm host}$ statistic, applied to dwarf hosts that are currently excluded, would test whether the anti-correlation extends or turns over; the paper notes that including the known dwarf and elliptical hosts would strengthen it, but a dedicated low-mass sample could settle the question.
- Upcoming wide-field FRB surveys with many $z<0.1$ bursts could turn the slope measurement into a differential feedback probe that does not rely on absolute calibration of the Macquart relation, since the slope is less sensitive to systematic shifts in the cosmic DM than the intercept.
- The argument's logic could be inverted into a simulation calibration target: any galaxy-formation model that aims to predict FRB observables should reproduce both the measured slope $m$ and the H$\alpha$-inferred ISM slope simultaneously.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper curates 20 low-redshift (z<0.2) FRB host galaxies with low scattering timescales, face-on geometry, and stellar masses in the range 10^9–10^11 M_sun, and fits a quadratic relation between the Macquart-estimated host dispersion measure (DM_host^Macquart) and host stellar mass. The fiducial fit yields a negative slope m = -97 ± 44 pc cm^-3 per dex (Table 2). The authors compare this with CGM-only predictions from CAMELS-Astrid, CAMELS-IllustrisTNG, and CAMELS-SIMBA, constructed by ray-tracing through simulation snapshots after excising gas within 0.1 R_200,crit. They find that the observed slope is discrepant with the positive Astrid slope m = 84 ± 7 at the 4.2σ level, and argue that reconciling the data with Astrid requires a strongly negative host ISM/CBM slope of about -180 pc cm^-3 per dex, which they regard as potentially unphysical. The paper concludes that weak-feedback models attributing a positive M*-DM_host correlation to the CGM are disfavored, implying an indirect lower limit on baryonic feedback in isolated L* halos at z<0.2. Robustness tests vary the cosmic DM contribution, the scatter model, the redshift split, the removal of one influential outlier, and the host association probability threshold.
Significance. If the result holds, it opens a new and observationally accessible probe of baryonic feedback in relatively low-mass, isolated halos, complementary to weak lensing and kSZ measurements that target higher masses and redshifts. The paper's strengths are real: the sample curation is transparent and carefully documented; the fitting procedure is standard and reproducible; the simulation comparison uses independent CAMELS runs and does not fit simulations to the data; and the robustness to σ_cosmic, redshift splits, and outlier removal is explicitly tested. The authors also state the key limitation themselves: the observational quantity includes ISM and circum-burst contributions while the simulation prediction is CGM-only, so the feedback conclusion hinges on the unmeasured slope of the ISM/CBM term. Given that the observed slope is only 2.2σ from zero and that the sample is defined by seven post-hoc cuts, the central claim is more fragile than the abstract's phrasing suggests.
major comments (4)
- [§5, Eq. (2), Table 2] The central feedback conclusion depends on the assumption that the host ISM and circum-burst medium do not produce a strongly negative slope in DM_host^Macquart versus stellar mass. The manuscript itself notes that reconciling the data with CAMELS-Astrid requires m_ISM+CBM ≈ -180 pc/cm^3/dex, and the paper calls this scenario 'potentially unphysical' but does not demonstrate that it is excluded. The external checks cited in §5 (Bernales-Cortes et al. Hα emission measures and the HI mass–stellar mass correlation) are not measurements of the free-electron column along FRB sightlines: the Hα sample has only 11 hosts and traces warm ionized regions, while HI mass is a total reservoir rather than a line-of-sight column. If lower-mass hosts have higher ionized-gas columns along the burst sightlines, the anti-correlation would be fully consistent with Astrid's positive CGM slope and the feedback constraint would vanish. This is a load-bearing, currently unresolved premise of the paper's main claim.
- [§2, criteria 1–7, Fig. 1] The sample is defined by seven post-hoc selection cuts (cluster exclusion, inclination, disk outskirts, dwarf/elliptical hosts, Galactic latitude, low-DM associations, and scattering timescale). Several of these cuts are correlated with DM itself, and potentially with stellar mass. For example, excluding low-DM FRB associations removes sightlines with systematically downward-biased DM, while excluding dwarf and elliptical hosts removes the extreme low- and high-mass ends of the galaxy population. The robustness tests in §4.1 vary individual analysis choices but do not include a selection-bias injection test or a demonstration that the excluded systems are distributed uniformly in the (M*, DM) plane. Without such a test, it remains possible that the selection procedure induces part or all of the measured negative slope.
- [Table 2, fiducial row] The fiducial observed slope is m = -97 ± 44 pc/cm^3/dex, which is only 2.2σ from zero. The paper's headline statement that 'the more massive the host, the lower its host DM' is considerably stronger than this marginal significance warrants. The 4.2σ tension with Astrid combines this 2.2σ measurement with a very precise simulation slope, so the tension is driven as much by the small error bar on the Astrid prediction as by the data. The abstract and conclusions should either quote the slope significance explicitly or temper the language to reflect that the anti-correlation is currently a 2.2σ effect, not a robust detection.
- [§3, Fig. 2, Table 2] The simulation prediction DM_h,CGM is defined operationally by excising all gas within 0.1 R_200,crit and integrating the electron density along a full 25 Mpc/h box axis divided by two. This is not the same physical quantity as the CGM term in Eq. (2), and the comparison therefore mixes a definitional choice with a physical prediction. The sensitivity of the fitted slope to the impact-parameter range is shown (Table 2, lower half), and the m_Astrid values do vary from 84 to 10 across ρ bins, which indicates that the slope comparison is sensitive to the assumed FRB offset distribution. The text argues that the true offsets are ρ ≲ 0.05, but this relies on an approximate conversion from R_eff to R_200,crit. A quantitative propagation of this uncertainty into the claimed 4.2σ discrepancy would strengthen the paper.
minor comments (6)
- [Abstract (duplicated)] The manuscript contains two versions of the abstract: the first begins 'Low redshift fast radio bursts (FRBs) provide robust measurements...' and the second, after the author list, begins 'Low redshift fast radio bursts (FRBs) enable robust measurements...'. One of them should be removed before submission.
- [§2, NED-LVS paragraph] The word 'consistant' should be 'consistent' in the sentence on NED-LVS mass estimates.
- [§5, paragraph on FRB 20210807D] The text refers to the highest-mass, lowest-DM source as 'FRB 20210807A', but Table 1 and §4.1 use 'FRB 20210807D'. The naming should be made consistent.
- [§4.1, σ_cosmic discussion] The sentence 'Jaroszynski 2019, see Fig. 2 of.' is incomplete and should be rewritten as a grammatical sentence.
- [References] The DOI for Kourkchi et al. (2020) appears corrupted ('10.1088/1538-4357/abburn1966depolarizationb') and should be corrected.
- [§4.1, Figure 4 citation] The text 'No FRB 20210807D variant in Fig. 4.1' should refer to 'Fig. 4', not 'Fig. 4.1'.
Circularity Check
No significant circularity: the observed DM–M* relation is measured directly, simulation slopes come from independent CAMELS runs, and the paper explicitly tests the one feedback-dependent input (σcosmic) it identifies.
full rationale
The central comparison is not circular. The observed quantity DMMacquart_host is constructed from the measured DM_FRB by subtracting Milky Way and cosmic foregrounds (Eq. 3), and the slope m = -97 ± 44 pc/cm^3/dex (Table 2) is a direct maximum-likelihood fit to 20 sightlines. The simulation slopes (m_Astrid = 84 ± 7, etc.) come from CAMELS snapshots with gas within 0.1 R200 removed (§3), independent of the observed sample; they are predictions, not fits to the data. The required ISM slope m ≈ -180 pc/cm^3/dex is obtained algebraically from m_obs - m_Astrid, so it is not an assumed input. The only feedback-dependent input in the observational analysis is σcosmic(z), and the paper explicitly acknowledges the potential feedback circularity in §4.1 ('our conclusions about feedback in galaxies depend on our parameter estimates, which in turn may depend on feedback circularly via σcosmic') and demonstrates that the results are insensitive to σcosmic by testing alternative prescriptions. The paper also transparently flags the key assumption that the host ISM and circum-burst medium do not generate a strongly negative DM–M* slope, and it supports this assumption with external empirical correlations (Hα-inferred DM from Bernales-Cortes et al. 2025; HI mass from Huang et al. 2012), which are not circular. Citations to Medlock et al. (2024, 2025) are methodological and not load-bearing for the central claim. Overall, no circular step reduces the conclusion to its inputs.
Assumptions & free parameters
free parameters (4)
- Slope m (observed) =
-97 ± 44 pc/cm3/dex
- Intercept b (observed) =
89 ± 27 pc/cm3
- Curvature a (observed) =
-11 +94/-93 pc/cm3/dex2
- Scatter sigma (observed) =
59 +20/-15 pc/cm3
assumptions (7)
- domain assumption DM budget decomposition (Eq. 1 and 2): DM_FRB = DM_MW + <DM_cosmic> + delta_DM_LSS + DM_host/(1+z), with DM_host = DM_h,CGM + DM_h,ISM + DM_CBM.
- domain assumption NE2001 and Yamasaki and Totani (2020) models describe the Milky Way ISM and CGM accurately enough for z < 0.2 sightlines.
- domain assumption Gaussian scatter for DM_host with mass-independent sigma (Eq. 5 and 6).
- domain assumption CAMELS fiducial feedback parameters (ASN1 = ASN2 = AAGN1 = AAGN2 = 1) at z = 0.1 represent each simulation suite.
- ad hoc to paper Cutting gas within 0.1 R200,crit removes the unresolved host ISM and defines DM_h,CGM.
- domain assumption sigma_cosmic(z) from Walker et al. (2024) IllustrisTNG values applies to observed sightlines.
- domain assumption The z < 0.2, face-on, low-scattering sample is representative of isolated star-forming FRB hosts with CGM-only contributions.
Cite this review
Pith. "Pith review of Stellar Mass-Dispersion Measure Correlations Constrain Baryonic Feedback in Fast Radio Burst Host Galaxies." pith.science (2026). https://pith.science/paper/QCJYHZ6K
@misc{pith2026250716816,
author = {Pith},
title = {Pith review of: Stellar Mass-Dispersion Measure Correlations Constrain Baryonic Feedback in Fast Radio Burst Host Galaxies},
year = {2026},
howpublished = {\url{https://pith.science/paper/QCJYHZ6K}},
note = {Machine review of arXiv:2507.16816}
}
abstract
Low redshift fast radio bursts (FRBs) provide robust measurements of the host-galaxy contribution to the dispersion measure (DM), which can constrain the circumgalactic medium (CGM) of the hosts. We curate a sample of 20 nearby FRBs with low scattering timescales and face-on host galaxies with stellar masses ranging from $10^9 < M^* / M_\odot < 10^{11}$. We fit the distribution of the host galaxy DM to a quadratic model as a function of stellar mass with a mass-independent scatter and find that the more massive the host, the lower its host DM. We report that this relation has a negative slope of $m = -97 \pm 44$ pc/cm$^{-3}$ per dex in stellar mass. We compare this measurement to similar fits to three sub-grid models implemented in the CAMELS suite of simulations from Astrid, IllustrisTNG, and SIMBA and find that fine-tuning of the host ISM contribution as a function of stellar mass is required in order to reconcile the observational data with the predictions of the fiducial CAMELS-Astrid model. More generally, models which attribute a positive correlation between stellar mass and host dispersion measure ($m > 0$) to the CGM are in tension with our measurement. We show that this conclusion is robust to a wide range of assumptions, such as the offset distribution of FRBs from their hosts and the statistics of the cosmic contribution to the DM budget along each sightline. Our results indirectly imply a lower limit on the strength of baryonic feedback in the Local Universe $(z < 0.2)$ in isolated $\sim L^*$ halos, complementing results from weak lensing surveys and kSZ observations which target higher halo mass and redshift ranges.
Figures
Figures from the paper (2 more)
Forward citations
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