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arxiv: 2606.24762 · v1 · pith:ARHFT6B4new · submitted 2026-06-23 · 🌌 astro-ph.GA · astro-ph.CO

Galactic Hubs: New Insights and SKA View of AGN Feedback in Galaxy Groups

T. Pasini , M. Brienza , C. J. Riseley This is my paper

Pith reviewed 2026-06-25 23:25 UTC · model grok-4.3

classification 🌌 astro-ph.GA astro-ph.CO
keywords AGN feedbackgalaxy groupsradio observationsSKAgalaxy evolutionnon-thermal emissionscaling relations
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The pith

SKA will enable detailed studies of AGN feedback in galaxy groups by providing high resolution and sensitivity across wide frequencies.

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

The paper reviews how AGN feedback explains scaling relations between supermassive black holes and galaxies, with most work focused on clusters but groups being key since they host most radio-loud AGN. Observational limits in high-energy regimes have restricted progress, though recent radio data show effects like overheating and displaced plasma. The central argument is that SKA's capabilities will overcome these limits, allowing large samples of groups for better statistics on galaxy evolution.

Core claim

Research on AGN feedback in galaxy groups is limited by observational constraints, but recent results from facilities like LOFAR indicate signatures of prolonged feedback activity, and the SKA is expected to facilitate construction of unprecedentedly large samples through its high resolution and sensitivity.

What carries the argument

The combination of high-resolution radio observations with X-ray data to link thermal and non-thermal emission in the context of AGN feedback.

If this is right

  • Improved understanding of the origin of supermassive black hole scaling relations in lower mass systems.
  • Identification of more examples of groups with evacuated environments due to powerful feedback.
  • Enhanced ability to study remnant plasma and sloshing motions in groups.
  • Greater statistical power for studies of galaxy evolution through large samples.

Where Pith is reading between the lines

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

  • Connecting these findings to broader models of black hole growth across different environments.
  • Potential for testing how feedback influences the overall baryon cycle in groups.
  • Extensions to multi-wavelength surveys could reveal frequency-dependent effects of AGN activity.

Load-bearing premise

That the primary barriers to progress are observational limitations in resolution and sensitivity rather than theoretical modeling challenges.

What would settle it

Observations with SKA that fail to produce larger samples or new insights into feedback processes in groups would challenge the expectation that it will close the knowledge gaps.

Figures

Figures reproduced from arXiv: 2606.24762 by C. J. Riseley, M. Brienza, T. Pasini.

Figure 1
Figure 1. Figure 1: Measured mass function for all simulations included in Tinker et al. (2008) which adopt a WMAP1 cosmology. The three curves show the mass function for different values of Δ, which is the highest overdensity for which the function can be directly measured in these simulations. In [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: The figure, adapted from Eckert et al. (2021), shows a compilation of literature measurements of the hot gas fraction at 𝑅500 in galaxy groups and clusters as a function of 𝑀500. We additionally include recent eRASS galaxy group measurements from Bulbul et al. (2024), shown as red circles. The vertical dashed line indicates the conventional mass threshold separating the group and cluster regimes. The light… view at source ↗
Figure 3
Figure 3. Figure 3: Artistic impression of the two main AGN modes. Left: radiative mode, dominated by accretion of cold gas and mediated by an optically thick, geometrically thin disk. Right: mechanical mode, mediated by ADAF onto an optically thin, geometrically thick disk. AGN activity is typically divided into two main modes, which we show for clarity in [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Multiple generations of AGN bubbles produced by the BGG of the galaxy group Nest200047 as observed by LOFAR (150 MHz) and uGMRT (400 and 700 MHz). The image is adapted from Brienza et al. (2025). correlations between BGG radio power and thermodynamical properties of the host group such as temperature and X-ray luminosity. In summary, all these studies consistently point to the crucial role of radio-loud AG… view at source ↗
Figure 5
Figure 5. Figure 5: Comparison of sensitivity, frequency coverage and resolution for the main radio continuum surveys between 10 MHz and 15 GHz. In red we show the potential sensitivity and frequency coverage of hypothetic surveys (∼1 hour per pointing) carried out with SKA-Low and SKA-Mid. hundred RMs along the line of sight through low-mass halos (1013 𝑀⊙); out to redshift 𝑧 ∼ 0.5 however we might only expect a few RMs per … view at source ↗
read the original abstract

Over the last two decades, significant effort has been devoted to understand the physical processes involved in galaxy evolution. In this context, AGN feedback has emerged as the leading explanation for several longstanding astrophysical questions, including the origin of scaling relations between supermassive black holes and their host galaxies. Galaxy clusters have been particularly put under the lens, thanks to the combination of high-resolution X-ray and radio observations which allowed to investigate the link between thermal and non-thermal emission. On the other hand, research in the lower-mass regime of galaxy groups remains limited. This is mostly due to observational limitations in the high-energy regime, which prevents the study of the non-thermal emission in the context of its surrounding environment. Nevertheless, this is a key topic for galaxy evolution, as the vast majority of radio-loud AGN in the nearby Universe are hosted in galaxy groups. Recently, modern radio facilities such as LOFAR, uGMRT and MeerKAT have obtained interesting results in this regime. Examples include signatures of overheating caused by AGN, groups with largely evacuated environments due to powerful and prolonged feedback activity, and remnant plasma displaced by large-scale sloshing motions. This chapter reviews these advances while identifying gaps in our understanding. We will explore how SKA promises to close these gaps and revolutionise the field through its unparalleled combination of high resolution and sensitivity across a wide frequency range. Moreover, its unique capabilities, in synergy with state-of-the-art and upcoming surveys carried out by new instruments, will facilitate the construction of unprecedentedly large samples of groups, dramatically enhancing the statistical power of future studies.

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 / 0 minor

Summary. The manuscript is a review chapter summarizing two decades of research on AGN feedback in galaxy evolution, with emphasis on the under-studied regime of galaxy groups. It contrasts the extensive X-ray/radio studies of clusters with the observational limitations in groups, reviews recent results from LOFAR, uGMRT and MeerKAT (overheating signatures, evacuated environments from prolonged feedback, and sloshing of remnant plasma), identifies remaining gaps, and argues that SKA will close these gaps and revolutionise the field via its high resolution, sensitivity and wide frequency coverage, enabling large statistical samples in synergy with other surveys.

Significance. If the synthesis of recent radio results and the projection of SKA capabilities hold, the review could be significant for guiding SKA science priorities in galaxy-group environments, which host the majority of nearby radio-loud AGN. It usefully flags concrete observational signatures and gaps from current facilities, providing a forward-looking perspective that could help shape observing strategies.

major comments (1)
  1. [Abstract] Abstract (and the central thesis): The claim that SKA will 'close these gaps and revolutionise the field' through its instrumental specifications assumes that current barriers are purely observational. The manuscript identifies gaps from LOFAR/uGMRT/MeerKAT results (overheating, evacuated environments, sloshing) but contains no discussion of whether existing theoretical models of group-scale AGN feedback are sufficient to interpret the expected high-resolution, multi-frequency data products, or whether new simulation frameworks and analysis techniques will also be required. This assumption is load-bearing for the 'revolutionise' conclusion.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their thoughtful and constructive review. We address the single major comment below and agree that a clarification is warranted to avoid any implication that observational advances alone will suffice.

read point-by-point responses

  1. Referee: [Abstract] Abstract (and the central thesis): The claim that SKA will 'close these gaps and revolutionise the field' through its instrumental specifications assumes that current barriers are purely observational. The manuscript identifies gaps from LOFAR/uGMRT/MeerKAT results (overheating, evacuated environments, sloshing) but contains no discussion of whether existing theoretical models of group-scale AGN feedback are sufficient to interpret the expected high-resolution, multi-frequency data products, or whether new simulation frameworks and analysis techniques will also be required. This assumption is load-bearing for the 'revolutionise' conclusion.

    Authors: We agree with the referee that the manuscript, as an observational review, does not explicitly discuss the adequacy of current theoretical models or the potential need for new simulation frameworks to interpret forthcoming SKA data. The central thesis focuses on how SKA's instrumental capabilities will overcome the specific observational limitations identified in recent LOFAR, uGMRT and MeerKAT results. To address this point directly and strengthen the manuscript, we will revise the abstract to temper the 'revolutionise' phrasing and add a short paragraph in the conclusions section acknowledging that new high-resolution, multi-frequency observations will also drive parallel advances in theoretical modeling and analysis techniques. This revision will make clear that SKA addresses key observational gaps while the full scientific impact will require complementary theoretical progress. revision: yes

Circularity Check

0 steps flagged

No circularity: purely descriptive review with no derivations or fitted predictions

full rationale

The paper is a review chapter summarizing observational results from LOFAR/uGMRT/MeerKAT on AGN feedback in galaxy groups and outlining SKA capabilities for larger samples. No equations, parameters, predictions, or derivations appear in the provided text or abstract. Claims about SKA closing gaps rest on stated instrumental specifications rather than any self-referential fitting, self-citation chains, or ansatz smuggling. The central premise (observational limits as primary barrier) is presented as a direct statement without reduction to prior author work or internal definitions. This matches the default case of a self-contained descriptive paper.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

As a review chapter, the text introduces no new free parameters, axioms, or invented entities; all content rests on previously published observational results.

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