REVIEW 5 major objections 5 minor 132 references
Star Formation Rates, Metallicities, and Stellar Masses on kpc-scales in TNG50
T0 review · 5 major / 5 minor · reviewed 2026-08-09 · deepseek-v4-flash
Pith's one-line read The paper argues that TNG50's resolved star-forming main sequence is a by-product of the Schmidt-Kennicutt law and a local gas-to-stellar mass relation, with its shallow slope coming from AGN feedback in massive hosts.
desk verdict Useful TNG50 measurements with an honest but unclosed 33% gap in the origin-of-rSFMS derivation. 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 machinery is a sample of 1-kpc $\times$ 1-kpc spaxel maps built from TNG50 galaxies with $M_\star>10^9\,M_\odot$, treated as individual parcels that can gain and lose gas. Three elements carry the argument: the Springel & Hernquist (2003) volumetric star-formation prescription, which makes the resolved Schmidt-Kennicutt relation a written-in rule rather than an emergent result; the composition identity $\Sigma_{\rm SFR}\propto\Sigma_{\rm gas}^k\propto\Sigma_\star^{nk}$, which converts the two host-independent gas relations into the rSFMS; and the generalized leaky-box equations (8), (13), and (22), which evolve stellar, gas, and metal surface densities with explicit inflow and outflow mass-loading factors $\eta_{\rm in}$ and $\eta_{\rm out}$.
What would settle it
Measure the resolved star-forming main sequence in galaxies with $M_\star<10^{10}\,M_\odot$ using an integral-field survey; if the slope is near $0.3$ rather than the $\sim0.66$ that TNG50 produces for such hosts, the claim that AGN feedback causes the shallow stacked slope fails.
Extended reading notes
Core claim
On 1-kpc spaxels at $z=0$, TNG50 produces a resolved star-forming main sequence $\Sigma_{\rm SFR}\propto\Sigma_\star^\alpha$ with a stacked slope $\alpha=0.30$, shallower than the $0.7$ to $1.1$ slopes reported by integral-field surveys. The paper's central claim is that this relation is not independently fundamental: it is the composition of the resolved Schmidt-Kennicutt law $\Sigma_{\rm SFR}\propto\Sigma_{\rm gas}^k$ (best-fit $k=1.52$) and the local gas-stellar mass relation $\Sigma_{\rm gas}\propto\Sigma_\star^n$ (best-fit $n=0.137$), which together predict $\alpha=nk\simeq0.20$. The remaining difference from the measured slope, and the flattening of the rSFMS with host mass, is attributed to AGN feedback: per-galaxy slopes fall from $0.66$ in the lowest-mass hosts to $0.30$ or inverted in the highest-mass hosts, and the high-mass systems dominate the stacked sample. The resolved mass-metallicity relation, by contrast, matches the observed shape, with its scatter governed by host stellar mass; and a generalized leaky-box model with explicit inflow and outflow terms describes the simulated gas and metallicity relations, preferring a near-zero net outflow rate.
Load-bearing premise
The whole leaky-box argument rests on the assumption that the gas inflow rate into a 1-kpc patch is proportional to that patch's star formation rate, an assumption the paper itself calls crude and untested at sub-galactic scales.
Editorial extensions
If this is right
- The rSFMS slope in TNG50 is not set by the star-formation law alone; it is the product of the Schmidt-Kennicutt index and the local gas-to-stellar mass index, so matching observed slopes means getting both gas relations right.
- Because low-mass TNG50 hosts already produce per-galaxy slopes near the observed range, the simulation's overall mismatch is concentrated above roughly $10^{10.5}\,M_\odot$, identifying AGN feedback as the physics to adjust.
- The good resolved mass-metallicity agreement indicates that metal production, return, and redistribution in TNG50 are consistent with integral-field observations even where star-formation feedback appears too aggressive.
- In the leaky-box model, the gas-stellar mass relation is controlled by the net outflow rate while the metallicity relation is controlled mainly by inflow dilution, so TNG50's resolved relations imply a low net outflow rate.
- Resolved scaling relations therefore provide a comparative test of feedback implementations: a simulation tuned to reproduce global galaxy properties can still fail or succeed on 1-kpc scales, and these relations show where to look.
Reading between the lines
- If the mass dependence is real, integral-field surveys that deliberately include low-mass star-forming galaxies should measure a steeper rSFMS than surveys dominated by $M_\star>10^{10.5}\,M_\odot$ systems; the mass-slope trend itself could become a calibrator for AGN feedback strength.
- The compositional derivation is quantitatively incomplete (predicted $\alpha=0.20$ versus measured $0.30$); redoing the same derivation with a molecular-gas version of the local gas-stellar relation could close the gap in TNG50, just as molecular gas does for the observed rSFMS.
- The paper's leaky-box conclusions rest on the proportionality between inflow and SFR at kpc scales; measuring the actual gas flux across spaxel boundaries in TNG50 would test Equation 11 directly and would either validate or revise the low-net-outflow preference.
- The absence of a resolved fundamental metallicity relation in TNG50, in tension with some observational analyses, may reflect AGN-driven central enrichment; forward-modeling synthetic integral-field observations from the simulation could determine whether the discrepancy is physical or diagnostic.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. This manuscript uses TNG50-1 to construct 1 kpc spaxel maps for 2,734 galaxies with Mstar > 1e9 Msun at z=0, and measures the resolved star-forming main sequence (rSFMS), the resolved mass-metallicity relation (rMZR), their host-mass dependence, and the resolved Schmidt-Kennicutt (SK) and gas-mass relations. It reports an rSFMS slope alpha=0.302, compares it with CALIFA, MaNGA, ALMaQUEST, PHANGS, and EAGLE, and argues that the rSFMS is an indirect consequence of the SK law combined with the local gas-stellar mass relation (predicted alpha=nk=0.20). The paper also extends the Zhu et al. (2017) resolved leaky-box model with explicit inflow and outflow terms, and interprets the TNG scaling relations as preferring a low net outflow rate.
Significance. The paper provides a useful TNG50 benchmark for kpc-scale scaling relations, with careful spaxel construction and explicit robustness tests in Appendices A and B, and it makes the code and data products publicly available. Its transparency about the prescribed nature of the SK law in TNG is a strength. The rMZR comparison and the host-mass decomposition of the rSFMS are valuable. If the quantitative gap in the origin argument and the ad hoc sub-kpc inflow assumption were addressed, the proposed interpretive framework would be a meaningful step toward connecting resolved observations with simulation subgrid physics.
major comments (5)
- [Section 4.1, Eq. (7)] The claimed origin of the rSFMS is only qualitative: combining the fitted SK law (epsilon=5.89e-14, k=1.52) with the gas-mass relation n=0.137 gives alpha=nk=0.20, while the rSFMS slope measured in Section 3.1 is alpha=0.302. The 33% shortfall is acknowledged but not closed, and the suggested molecular-gas explanation is not tested. Because this is the quantitative basis for conclusion (iii), the central claim should either be reframed as a qualitative tendency or be supported by a molecular-gas or radial-inclusive calculation.
- [Section 4.1.1, Figure 10] Equation (7) assumes a single-power-law SK normalization, but Figure 10 shows that the SK normalization depends on galactocentric radius, and Section 4.1.1 invokes exactly this radial dependence to explain the host-mass dependence of the rSFMS. Omitting the radial term from the derivation while making it central to the mass-dependence argument is internally inconsistent: the same mechanism cannot be negligible in the origin claim and dominant in the mass-dependence explanation. A derivation that includes the radial dependence of epsilon, or an explicit justification for averaging it out, is needed.
- [Section 3.1.1, Table 1] The host-mass-resolved slopes in Table 1 range from alpha=0.671 in the lowest-mass bin to alpha=0.25-0.33 at high mass. The low-mass slope is more than three times the predicted 0.20 from Section 4.1, and this is the regime where AGN feedback in TNG is weakest. The attribution of the simulated-versus-observed slope difference to over-strong AGN feedback in massive hosts (Section 3.1.1) therefore does not address the failure of the origin model at low host masses.
- [Section 4.2, Eq. (11)] The leaky-box model's conclusions about net outflow rates depend on the assumption dSigma_gas,in/dt = eta_in Sigma_SFR at 1 kpc scales, which the paper itself labels as '(crude)'. Equations (12)-(14) and the Section 4.2.2 preference for a low net outflow rate all follow from this proportionality. The assumption should be checked directly in TNG, for example by measuring gas fluxes across spaxel boundaries; without such a check, the outflow/inflow conclusion is not established.
- [Section 4.2, Eqs. (20)-(22)] The conclusion that the rMZR is insensitive to eta_out (Section 4.2.2) follows from the assumption in Equation (20) that outflowing gas has exactly the spaxel's current metallicity. This assumption is not checked against TNG, where wind metal loading can differ from the local ISM value. If outflows are preferentially metal-enriched or metal-poor, the rMZR would depend on eta_out and the contrast with 'net outflow' models would weaken.
minor comments (5)
- [Section 3, introductory paragraph] The text refers to the 'Kennicut-Schmidt relation'; this should be 'Kennicutt-Schmidt relation'.
- [Figure 2 caption] The PHANGS comparison is described as a 'solid purple line' in the text and as a 'solid black line' in the caption; please make the line descriptors consistent.
- [Section 4.2.2] The text says Figures 14 and 15 show predictions for the rSFMS and rMZR, but Figure 14 shows the gas-mass main sequence; please correct the figure reference.
- [Section 5, item (ii)] The word 'IllutrisTNG' is a typo and should read 'IllustrisTNG'.
- [Section 4.2.1, Figures 12-13] The 'five representative spaxels' are mentioned repeatedly but their initial Sigma_gas values are not defined in the text or figures; please identify these tracks explicitly.
Circularity Check
No significant circularity: the rSFMS derivation combines a prescribed (but explicitly acknowledged) SK law with an emergent gas–stellar mass relation and is not forced; the leaky-box model is a calibrated toy rather than a prediction.
full rationale
The paper's central derivation (Section 4.1) combines Eq. 5 (SK: ΣSFR=εΣgas^k) with Eq. 6 (Σgas∝Σ⋆^n) to obtain Eq. 7 (ΣSFR∝Σ⋆^{nk}) and compares α=nk=0.20 with the directly measured rSFMS slope 0.302. This is an algebraic combination of two independently measured relations, not a restatement of the rSFMS: the predicted slope is not imposed and in fact differs by about 33%, which the authors explicitly concede. The SK relation is indeed a prescribed subgrid input in TNG (Section 2.1: "The existence of the (resolved) Schmidt-Kennicutt relation in these models is therefore not emergent, it is prescribed"), but the paper says so and does not claim otherwise; the Σgas–Σ⋆ relation is emergent, so the derivation contains independent content. The leaky-box model (Section 4.2) is calibrated using TNG's SK parameters (ε,k), return fraction R, and yield y, and the inflow/outflow loading factors are varied to match the same TNG relations; the resulting "preference for a low net outflow rate" is a parameter constraint from fitting, not a prediction dressed as a first-principles result. No load-bearing self-citation or imported uniqueness theorem is used: self-citations (Hemler et al. 2021; Garcia et al. 2023/2024/2025) support peripheral statements about TNG metallicity gradients and are not the basis of the main argument. External benchmarks (CALIFA, MaNGA, PHANGS, EAGLE) are used for comparison, and the rMZR agreement is an independent check. Therefore no circular step meets the bar of Eq. X = Eq. Y by construction or a fitted parameter renamed as a prediction.
Assumptions & free parameters
free parameters (6)
- initial gas surface density (Sigma_gas,0) range =
10^7.5 to 10^10.0 M_sun/kpc^2 in steps of 0.25 dex
- inflow mass loading factor eta_in =
0.0, 0.25, 0.5
- outflow mass loading factor eta_out =
0.0, 0.25, 0.5
- return fraction R =
0.5
- metal yield y =
0.05
- SK slope k and normalization epsilon =
k=1.52, epsilon=5.89e-14
assumptions (5)
- domain assumption Star formation follows the volumetric Schmidt-Kennicutt relation with free-fall time proportionality (Equation 2).
- ad hoc to paper Inflow rate is proportional to SFR at sub-galactic scales (Equation 11).
- ad hoc to paper Outflowing gas has the same metallicity as the current spaxel (Equation 20).
- domain assumption Inflowing gas is pristine, with Z_in = 0.
- domain assumption Average stellar mass migration into and out of spaxels is negligible.
Cite this review
Pith. "Pith review of Star Formation Rates, Metallicities, and Stellar Masses on kpc-scales in TNG50." pith.science (2026). https://pith.science/paper/62HI3IBR
@misc{pith2026250118687,
author = {Pith},
title = {Pith review of: Star Formation Rates, Metallicities, and Stellar Masses on kpc-scales in TNG50},
year = {2026},
howpublished = {\url{https://pith.science/paper/62HI3IBR}},
note = {Machine review of arXiv:2501.18687}
}
abstract
Integral field units (IFU) have extended our knowledge of galactic properties to kpc (or, sometimes, even smaller) patches of galaxies. These scales are where the physics driving galaxy evolution (feedback, chemical enrichment, etc.) take place. Quantifying the spatially-resolved properties of galaxies, both observationally and theoretically, is therefore critical to our understanding of galaxy evolution. To this end, we investigate spatially-resolved scaling relations within galaxies of $M_\star>10^{9.0}$ at $z=0$ in IllustrisTNG. We examine both the resolved star-forming main sequence (rSFMS) and the resolved mass-metallicity relation (rMZR) using $1~{\rm kpc}\times1~{\rm kpc}$ maps. We find that the rSFMS in IllustrisTNG is well-described by a power-law, but is significantly shallower than the observed rSFMS. However, the disagreement between the rSFMS of IllustrisTNG and observations is likely driven by an overestimation of AGN feedback in IllustrisTNG for the higher mass hosts. Conversely, the rMZR for IllustrisTNG has very good agreement with observations. Furthermore, we argue that the rSFMS is an indirect result of the Schmidt-Kennicutt (SK) law and local gas relation, which are both independent of host galaxy properties. Finally, we expand upon a localized leaky-box model to study the evolution of idealized spaxels and find that it provides a good description of these resolved relations. The degree of agreement, however, between idealized spaxels and simulated spaxels depends on the `net' outflow rate for the spaxel, and the IllustrisTNG scaling relations indicate a preference for a low net outflow rate.
Figures
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Reference graph
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