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arxiv: 2512.05584 · v2 · pith:L3YPQGSGnew · submitted 2025-12-05 · 🌌 astro-ph.GA

Stellar feedback drives the baryon deficiency in low-mass galaxies

Haoran Yu , Enci Wang , Zeyu Chen , C\'eline P\'eroux , Hu Zou , Zhicheng He , Huiyuan Wang , Cheqiu Lyu
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Cheng Jia Chengyu Ma Xu Kong
This is my paper

Pith reviewed 2026-05-21 18:11 UTC · model grok-4.3

classification 🌌 astro-ph.GA
keywords stellar feedbackbaryon retentionlow-mass galaxiesoutflowsdark matter halosMg II absorptioncircumgalactic medium
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The pith

Stellar feedback launches outflows that escape dark matter halos in low-mass galaxies, explaining their baryon shortage.

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

The paper stacks spectra from about 400,000 galaxies observed by DESI to detect cool gas outflows traced by magnesium absorption lines driven by star formation. Calculations assuming gravity alone show that these outflows from galaxies below 10 billion solar masses in stellar mass reach speeds sufficient to leave their dark matter halos. The result lines up with separate observations of absorption in the gas surrounding galaxies along their minor axes. This supplies indirect support for the idea that stellar feedback removes baryons from low-mass halos and links internal galaxy processes to material outside the halos.

Core claim

Stacking analyses reveal star-formation-driven cool outflows in Mg II absorption. Under the assumption that only gravity acts on the gas after launch, outflows from low-mass galaxies (M_* < 10^10 M_⊙) escape beyond the dark matter halos, consistent with circumgalactic medium absorption along minor axes and thereby offering indirect evidence that stellar feedback produces the low baryon retention rate in low-mass halos.

What carries the argument

Escape-velocity calculation for outflowing gas under gravity alone, applied to observed Mg II absorption velocities from stacked spectra.

If this is right

  • Low-mass dark matter halos retain fewer baryons because feedback ejects material outside the halo boundary.
  • Baryonic processes inside galaxies connect directly to the distribution of diffuse matter beyond dark matter halos.
  • The same outflow mechanism accounts for the observed baryon deficiency across low-mass systems.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Galaxy-formation simulations would need to incorporate efficient ejection beyond virial radii to match observed baryon fractions.
  • Future wide-field spectroscopy could map the radial extent of these outflows to test escape in individual systems.
  • The result bears on the broader missing-baryons problem by showing one channel for baryons to leave galactic halos.

Load-bearing premise

The assumption that only gravity acts on the launched gas after it leaves the galaxy.

What would settle it

Direct measurement of gas kinematics or absorption at radii beyond the virial radius of low-mass galaxies showing whether outflow speeds exceed the local escape velocity.

Figures

Figures reproduced from arXiv: 2512.05584 by C\'eline P\'eroux, Cheng Jia, Chengyu Ma, Cheqiu Lyu, Enci Wang, Haoran Yu, Huiyuan Wang, Hu Zou, Xu Kong, Zeyu Chen, Zhicheng He.

Figure 1
Figure 1. Figure 1: Assuming the geometry of the outflow to be an expanding spherical thin shell launching at [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
read the original abstract

Stellar feedback, as a key process regulating the baryon cycle, is thought to greatly redistribute baryonic material inside and outside the dark matter halos (DMHs), however the observational evidences are lacking. Through stacking analyses of ~400,000 galaxy spectra from Dark Energy Spectroscopic Instrument (DESI), we find star formation driven cool outflows in Mg II absorption line. Assuming only gravity acts on the launched gas, our calculations reveal that outflows from low mass galaxies ($M_*<10^{10}\,\rm M_\odot$) are capable of escaping beyond the DMHs, which aligns well with our finding in the circumgalactic medium (CGM) absorption along the minor-axes of galaxies using background quasars. This research offers indirect evidence that stellar feedback drives the low baryon retention rate in low-mass haloes, implicating that baryonic processes within galaxies are connected with the diffuse matter beyond the DMHs.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 2 minor

Summary. The manuscript reports a stacking analysis of ~400,000 DESI galaxy spectra that detects star-formation-driven cool outflows via Mg II absorption. Under the assumption that only gravity acts on the launched gas, the authors find that outflow velocities in galaxies with M_* < 10^10 M_⊙ exceed the escape velocity at the virial radius. This is linked to CGM absorption along minor axes and interpreted as indirect evidence that stellar feedback drives the low baryon retention rate in low-mass halos.

Significance. If the escape conclusion is robust, the work would provide useful observational support for stellar feedback regulating baryon content in low-mass galaxies by connecting internal outflow kinematics to halo-scale escape and CGM observations. The large DESI sample size for the stacking analysis is a clear strength that enables statistical detection of the Mg II feature.

major comments (1)
  1. [Abstract] Abstract: the central claim that outflows escape beyond the DMHs (and thereby explain baryon deficiency) rests on the explicit assumption that 'only gravity acts on the launched gas'. The manuscript performs a standard gravitational escape-velocity comparison but does not integrate the equation of motion with a ram-pressure drag term, vary the CGM density profile, or report the fraction of sight-lines that remain bound once non-gravitational forces are included. This assumption is load-bearing for the escape interpretation.
minor comments (2)
  1. [Abstract] Abstract: no quantitative error bars, outflow-velocity distributions, or robustness checks against alternative interpretations of the Mg II feature are reported, making it difficult to assess the statistical significance of the velocity-escape comparison.
  2. [Methods] The manuscript would benefit from a brief discussion of how the stacking results depend on the precise definition of the Mg II absorption velocity (e.g., centroid vs. maximum extent) and any associated systematic uncertainties.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the positive assessment of our work's significance and for highlighting the strength of the large DESI sample. We address the major comment regarding the gravitational escape assumption below.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the central claim that outflows escape beyond the DMHs (and thereby explain baryon deficiency) rests on the explicit assumption that 'only gravity acts on the launched gas'. The manuscript performs a standard gravitational escape-velocity comparison but does not integrate the equation of motion with a ram-pressure drag term, vary the CGM density profile, or report the fraction of sight-lines that remain bound once non-gravitational forces are included. This assumption is load-bearing for the escape interpretation.

    Authors: We agree that the escape interpretation depends on the stated assumption that only gravity acts on the launched gas after it leaves the galaxy, which is explicitly noted in the abstract and methods. This is a standard initial comparison in the observational literature for assessing whether outflows can reach halo scales. A full integration of the equation of motion including ram-pressure drag would require adopting a specific CGM density profile and drag parameters that are not constrained by our Mg II stacking data. In the revised version we have added a dedicated paragraph in the discussion section that qualitatively explores the possible effects of moderate drag, notes that the actual bound fraction could be higher than the pure-gravity case, and reiterates that the results constitute indirect evidence. The independent finding of enhanced CGM absorption along minor axes remains consistent with gas reaching large radii. We therefore view the assumption as a transparent limitation rather than a fatal flaw in the overall interpretation. revision: partial

Circularity Check

0 steps flagged

No significant circularity; escape-velocity comparison uses independent observed velocities and standard potential

full rationale

The paper derives its central claim by stacking ~400,000 DESI spectra to detect Mg II outflows, then feeding the measured absorption velocities into a standard gravitational escape-velocity calculation at the virial radius under the explicit gravity-only assumption. This step does not reduce by construction to any parameter fitted from the same dataset, nor does it rely on a self-citation chain for the load-bearing logic; the potential is the conventional NFW or isothermal form and the velocities are direct observables. The alignment with the paper's own CGM minor-axis absorption findings is presented as corroboration rather than a definitional loop. No self-definitional, fitted-input-renamed-as-prediction, or ansatz-smuggled steps appear in the provided derivation chain, leaving the result self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The escape conclusion depends on a single domain assumption about post-launch forces; no free parameters or new entities are introduced in the abstract.

axioms (1)
  • domain assumption Only gravity acts on the launched gas after ejection from the galaxy.
    Explicitly stated in the abstract as the basis for the escape-velocity calculation.

pith-pipeline@v0.9.0 · 5721 in / 1301 out tokens · 41247 ms · 2026-05-21T18:11:26.670141+00:00 · methodology

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