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arxiv: 2602.10192 · v1 · submitted 2026-02-10 · 🌌 astro-ph.GA

Recognition: no theorem link

Forged by Feedback: Stellar Properties of Brightest Group Galaxies in Cosmological Simulations

Ruxin Barr\'e (1) , Arif Babul (1 , 2 , 3) , Ghassem Gozaliasl (4 , 5) , Alexis Finoguenov (5) , Romeel Dav\'e (2
show 25 more authors
6) Aviv Padawer-Blatt (1) Douglas Rennehan (7) Vida Saeedzadeh (8) Renier T. Hough (9 10) Thomas R. Quinn (11) ((1) University of Victoria Canada (2) University of Edinburgh United Kingdom (3) Indian Institute of Science India (4) Aalto University Finland (5) University of Helsinki (6) University of the Western Cape South Africa (7) Flatiron Institute USA (8) Johns Hopkins University (9) North-West University (10) National Institute for Theoretical Computational Sciences (11) University of Washington USA)
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Pith reviewed 2026-05-16 02:24 UTC · model grok-4.3

classification 🌌 astro-ph.GA
keywords brightest group galaxiesAGN feedbackcosmological simulationsgalaxy quenchingstellar propertiesCOSMOS observationsblack hole growth
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The pith

OBSIDIAN's three-regime AGN feedback model reproduces the stellar properties of brightest group galaxies more closely than the other simulations tested.

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

The paper compares brightest group galaxies across four cosmological simulations to X-ray-selected groups observed in the COSMOS field. It shows that the choice of AGN feedback prescription strongly shapes the stellar masses, star formation rates, and quenching behavior of these galaxies. OBSIDIAN's model, which applies different feedback regimes depending on conditions, produces distributions and evolutionary trends that align best with the data. The other runs either leave galaxies too star-forming or quench them too suddenly once jets activate. This points to AGN feedback as the main driver setting how massive galaxies in groups grow and shut down.

Core claim

OBSIDIAN's three-regime AGN feedback model produces BGG populations whose stellar mass distributions, specific star formation rates, mass-weighted ages, and quenched fractions match those measured for X-ray-selected groups in COSMOS, while ROMULUS leaves BGGs overly star-forming, and SIMBA and SIMBA-C produce overly rapid quenching once powerful jet feedback begins.

What carries the argument

The three-regime AGN feedback implementation in OBSIDIAN, which switches between different modes of energy injection and black-hole growth regulation to control gas cooling and star formation in massive galaxies.

If this is right

  • BGGs in OBSIDIAN and COSMOS exhibit gradual rather than abrupt decline in star formation with increasing stellar mass.
  • Powerful jet feedback in SIMBA and SIMBA-C triggers rapid quenching once it activates, unlike the more gradual effect in OBSIDIAN.
  • ROMULUS thermal AGN feedback fails to suppress cooling flows, leaving BGGs under-quenched and highly star-forming.
  • Physically motivated multi-regime AGN prescriptions are required to capture the observed diversity of BGG evolutionary paths in group environments.

Where Pith is reading between the lines

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

  • The results imply that future simulations need to incorporate condition-dependent AGN modes to avoid either under- or over-quenching at the high-mass end.
  • If the gradual quenching trend holds in wider surveys, it would constrain the timing when jet feedback becomes dominant in group-scale halos.
  • The comparison suggests that group environments amplify small differences in feedback efficiency into large differences in central galaxy properties.

Load-bearing premise

Differences in BGG stellar properties between the simulations are caused mainly by variations in their AGN feedback models rather than by differences in resolution, hydrodynamics solvers, or other subgrid choices.

What would settle it

A larger observational sample of BGGs showing a sharp drop in star formation rate at a specific stellar mass threshold that matches SIMBA but deviates from OBSIDIAN would falsify the claim that the three-regime model provides the best match.

Figures

Figures reproduced from arXiv: 2602.10192 by 10), (10) National Institute for Theoretical, (11) University of Washington, 2, (2) University of Edinburgh, 3), (3) Indian Institute of Science, (4) Aalto University, 5), (5) University of Helsinki, 6), (6) University of the Western Cape, (7) Flatiron Institute, (8) Johns Hopkins University, (9) North-West University, Alexis Finoguenov (5), Arif Babul (1, Aviv Padawer-Blatt (1), Canada, Computational Sciences, Douglas Rennehan (7), Finland, Ghassem Gozaliasl (4, India, Renier T. Hough (9, Romeel Dav\'e (2, Ruxin Barr\'e (1), South Africa, Thomas R. Quinn (11) ((1) University of Victoria, United Kingdom, USA, USA), Vida Saeedzadeh (8).

Figure 1
Figure 1. Figure 1: Top: BGG redshift distributions. Simulated BGGs satisfying log(LX, 0.1−2.4 keV/erg s−1 ) ≥ 41.4 are se￾lected from nine snapshots to match the redshift distribu￾tion of the COSMOS sample (grey shaded histogram). The Romulus25 histogram is outlined in dotted red, Simba in dashed green, Simba-C in solid yellow, and Obsidian in dot– dashed blue. The vertical black lines mark the boundaries between redshift bi… view at source ↗
Figure 2
Figure 2. Figure 2: LX −M∗ relations for observed and simulated BGGs. Top: The initial samples of simulated BGGs for all LX. The Simba, Simba-C, and Obsidian BGGs are rep￾resented by median lines, with outer lines and data points showing the 16th and 84th inter-percentile regions and outer scatter. The black line illustrates the COSMOS minimum log(LX, 0.1−2.4 keV/erg s−1 ) ≃ 41.4. All other formatting fol￾lows that of [PITH_… view at source ↗
Figure 3
Figure 3. Figure 3: contains the results of two-sided KS tests com￾paring the log(M∗/M⊙) distributions of the simulated BGG samples to that of the COSMOS sample. The Romulus25 BGGs occupy a narrow range in log(M∗/M⊙) in comparison to the other samples. The small (25 cMpc)3 simulation volume constrains both the number of systems that can form and how massive they will become. This limits the extent of the high-M∗ end of the di… view at source ↗
Figure 4
Figure 4. Figure 4: depicts the normalised density histograms and sample medians describing the sSFRs of our sim￾ulated and observed BGGs. The top panel of [PITH_FULL_IMAGE:figures/full_fig_p011_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: BGG mass-weighted stellar age (Agew) distri￾butions. Formatting follows that of [PITH_FULL_IMAGE:figures/full_fig_p013_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: sSFR−M∗ relations for samples of BGGs with log(sSFR/yr−1 ) > −12. The central panel depicts individual BGGs on the sSFR−M∗ plane with markers following the formatting of [PITH_FULL_IMAGE:figures/full_fig_p014_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: BGG quenched fractions. BGGs are considered quenched if they lie more than 0.75 dex below the K. E. Whitaker et al. (2012) SFMS (see [PITH_FULL_IMAGE:figures/full_fig_p015_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: BGG stellar age scaling relations. The BGG mass-weighted stellar age (Agew) is shown as a function of stellar mass in the top panel, and as a function of sSFR in the bottom panel. All formatting follows that of [PITH_FULL_IMAGE:figures/full_fig_p016_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: Overview of star formation and quenching in Simba and its variants for BGGs with log(M∗/M⊙) ∈ [10, 12]. From left to right, the first, second, and third columns respectively highlight BGGs from the Simba (green, dashed lines), Simba-C (yellow, solid lines), and Obsidian (blue, dot-dashed lines) simulations. Top row: The sSFR−M∗ relation for all sSFRs. The simulations’ median relations are shown in every pa… view at source ↗
read the original abstract

We investigate how different galaxy formation models impact the stellar properties of brightest group galaxies (BGGs) in four cosmological simulations: ROMULUS, SIMBA, SIMBA-C, and OBSIDIAN. The stellar masses, specific star formation rates, and mass-weighted stellar ages of the simulated BGGs are analysed alongside those of observed BGGs from X-ray-selected galaxy groups in the COSMOS field. We find that the global properties and underlying evolutionary pathways of simulated BGG populations are strongly impacted by the strength and mechanism of their respective active galactic nucleus (AGN) feedback models, which play a critical role in regulating the growth of massive galaxies. OBSIDIAN's sophisticated three-regime AGN feedback model achieves the highest overall agreement with COSMOS observations, matching stellar property distributions, quenched fractions, and the evolution of star formation in increasingly massive systems. We find evidence suggesting that BGG populations of OBSIDIAN and COSMOS undergo a gradual decline in star formation with stellar mass, in contrast to SIMBA and SIMBA-C, which display rapid quenching linked to the onset of powerful AGN jet feedback. By comparison, ROMULUS produces highly star-forming, under-quenched BGGs due to the inefficiency of its thermal AGN feedback in preventing cooling flows from fuelling BGG growth. The success of the OBSIDIAN simulation demonstrates the importance of physically motivated subgrid prescriptions for realistically capturing the processes that shape BGGs and their dynamic group environments.

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

2 major / 2 minor

Summary. The manuscript compares stellar properties (masses, sSFRs, ages, quenched fractions, and star-formation evolution) of brightest group galaxies (BGGs) in four cosmological simulations—ROMULUS, SIMBA, SIMBA-C, and OBSIDIAN—against X-ray-selected groups in the COSMOS field. It concludes that AGN feedback strength and mechanism dominate BGG evolution, with OBSIDIAN’s three-regime model providing the closest match to observations while ROMULUS under-quenches and SIMBA/SIMBA-C quench too rapidly.

Significance. If the causal attribution to AGN feedback is robust, the work supplies a useful benchmark for how sub-grid prescriptions regulate massive-galaxy growth in groups and demonstrates that more physically detailed feedback can reproduce observed quenching trends with mass.

major comments (2)
  1. [Section 2] Section 2 (Simulation descriptions) and the abstract: the central claim that differences in BGG properties are “strongly impacted by the strength and mechanism of their respective AGN feedback models” is not isolated from other simulation variations. ROMULUS, SIMBA, SIMBA-C, and OBSIDIAN differ in hydrodynamics solvers, resolution, and additional sub-grid physics; no controlled experiment (same code base, only AGN varied) is reported. Consequently the attribution of ROMULUS under-quenching or SIMBA rapid jet quenching specifically to their AGN regimes remains untested.
  2. [§4.3] §4.3 (Star-formation evolution with mass): the statement that OBSIDIAN and COSMOS show a “gradual decline” while SIMBA/SIMBA-C show “rapid quenching” is presented qualitatively. No quantitative measure (e.g., slope of sSFR–M⋆ relation or KS-test p-values between distributions) is given to substantiate the distinction or to rank the models objectively.
minor comments (2)
  1. [Figure 1] Figure 1 caption: the mass range and selection cuts applied to the COSMOS BGG sample are not stated explicitly; please add the exact stellar-mass and group-mass limits used for the observational comparison.
  2. [Introduction] Notation: the abbreviation “BGG” is introduced in the abstract but the first use in the main text should be spelled out for clarity.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their constructive and detailed report. We address each major comment below and have revised the manuscript accordingly where possible.

read point-by-point responses

  1. Referee: [Section 2] Section 2 (Simulation descriptions) and the abstract: the central claim that differences in BGG properties are “strongly impacted by the strength and mechanism of their respective AGN feedback models” is not isolated from other simulation variations. ROMULUS, SIMBA, SIMBA-C, and OBSIDIAN differ in hydrodynamics solvers, resolution, and additional sub-grid physics; no controlled experiment (same code base, only AGN varied) is reported. Consequently the attribution of ROMULUS under-quenching or SIMBA rapid jet quenching specifically to their AGN regimes remains untested.

    Authors: We agree that the four simulations differ in multiple respects beyond AGN feedback prescriptions, including hydrodynamics solvers, resolution, and other sub-grid physics, and that a controlled experiment isolating only the AGN model would provide the cleanest attribution. Our choice of these particular simulations was driven by their distinct AGN feedback implementations, which span a range of current approaches in the literature. In the revised manuscript we will expand Section 2 to explicitly list and discuss these additional differences, moderate the language in the abstract and conclusions to state that AGN feedback is a dominant rather than the sole driver, and note the absence of a same-code controlled comparison as a limitation of the present study. revision: partial

  2. Referee: [§4.3] §4.3 (Star-formation evolution with mass): the statement that OBSIDIAN and COSMOS show a “gradual decline” while SIMBA/SIMBA-C show “rapid quenching” is presented qualitatively. No quantitative measure (e.g., slope of sSFR–M⋆ relation or KS-test p-values between distributions) is given to substantiate the distinction or to rank the models objectively.

    Authors: We thank the referee for this suggestion. In the revised §4.3 we will add quantitative measures: the fitted slopes of the sSFR–M⋆ relation for each simulation and the COSMOS sample, together with Kolmogorov-Smirnov p-values comparing the sSFR distributions across mass bins. These statistics will allow an objective ranking of model agreement with the observed gradual decline. revision: yes

Circularity Check

0 steps flagged

No significant circularity in simulation-observation comparison

full rationale

The paper compares stellar masses, sSFRs, ages, quenched fractions and SF evolution of BGGs from four independent cosmological simulations (ROMULUS, SIMBA, SIMBA-C, OBSIDIAN) directly against external COSMOS observational data. No equations, fitted parameters, or self-citations are invoked to derive the target results; the attribution of differences to AGN feedback regimes rests on comparative analysis of pre-existing simulation outputs rather than any self-definitional loop or prediction that reduces to its own inputs by construction. The derivation chain is therefore self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The paper's conclusions depend on the accuracy of the subgrid physics in the simulations and the assumption that the COSMOS BGG sample is unbiased.

free parameters (1)
  • AGN feedback parameters
    Each simulation employs distinct parameters for AGN energy injection, coupling efficiency, and mode transitions that are calibrated to match certain galaxy properties.
axioms (1)
  • domain assumption The subgrid AGN feedback models capture the essential physics regulating galaxy growth
    Invoked when attributing differences in BGG properties to feedback strength and mechanism.

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