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arxiv: 2607.00327 · v1 · pith:HWWC5YTMnew · submitted 2026-07-01 · 🌌 astro-ph.GA

Direct VLBI evidence for a buried AGN in the triple-merger LIRG UGC 2369S

Wancheng Xu , S\'andor Frey , Lang Cui , Krisztina \'Eva Gab\'anyi This is my paper

Pith reviewed 2026-07-02 09:42 UTC · model grok-4.3

classification 🌌 astro-ph.GA
keywords UGC 2369SVLBILIRGburied AGNtriple mergerobscured nucleusradio imagingCompton-thick
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The pith

VLBI imaging detects a compact radio source confirming a buried AGN in the northern core of UGC 2369S

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

The paper analyzes archival VLBI data at 1.6 to 5 GHz to map the radio emission from UGC 2369S, a luminous infrared galaxy in a late-stage triple merger. A compact component appears at the northern core with brightness temperature above 10 million Kelvin and a spectral index of roughly -0.45. These traits establish the presence of an obscured active galactic nucleus that optical and infrared light cannot reach through the surrounding dust and gas. The source shows sub-Eddington accretion consistent with a radiatively inefficient state and is surrounded by Compton-thick material while producing jets.

Core claim

High-resolution VLBI observations detect a compact radio component at the northern core of UGC 2369S. This component exhibits brightness temperature greater than 10^7 K and a spectral index of approximately -0.45, directly confirming an obscured AGN. The AGN is low-luminosity, accretes at an Eddington ratio of about 2.7 times 10 to the minus 4, and sits inside a Compton-thick gas cocoon while emitting jets.

What carries the argument

The compact milliarcsecond-scale radio component detected by VLBI visibility modeling, identified by its high brightness temperature and flat spectrum as AGN emission rather than other nuclear processes.

Load-bearing premise

That the combination of high brightness temperature above 10 million K and flat spectrum must come from an AGN instead of supernova remnants or similar non-AGN sources.

What would settle it

Higher-resolution radio observations that resolve the source and measure a brightness temperature below 10^6 K or a much steeper spectrum would remove the AGN confirmation.

Figures

Figures reproduced from arXiv: 2607.00327 by Krisztina \'Eva Gab\'anyi, Lang Cui, S\'andor Frey, Wancheng Xu.

Figure 1
Figure 1. Figure 1: Naturally weighted VLBI images of UGC 2369S. The central coordinates of all panels are aligned to the core position derived from the VLBA 5 GHz image. The synthesized restoring beams are shown as gray ellipses in the bottom-left corner of each panel. Scale bars are shown in the bottom right corner of each panel. The contours are drawn at 5σ × [−1, 1, 2, 4, 8] for the EVN 1.6 GHz image, and at 3σ × [−1, 1, … view at source ↗
read the original abstract

UGC 2369S is a luminous infrared galaxy (LIRG) undergoing a late-stage merger in a triple system, where the heavily obscured northern core is suspected to host an active galactic nucleus (AGN). However, severe dust and gas obscuration makes definitive confirmation challenging. We aim to provide direct observational evidence for the buried AGN through high-resolution radio imaging, while investigating the AGN accretion and feedback properties within this merger-driven gas-rich environment. We analyzed archival European VLBI Network (1.6 GHz) and Very Long Baseline Array (1.7 and 5 GHz) data of UGC 2369S. Through high-resolution imaging and visibility-domain Gaussian modeling, we characterized the morphology and intensity of its milliarcsecond-scale radio emission. A compact radio component is detected at the northern core, exhibiting high brightness temperature ($T_{\rm b}>10^7$ K) and flat radio spectrum ($\alpha \approx -0.45$), which confirms the presence of an obscured AGN. The sub-Eddington accretion rate ($\lambda_{\rm Edd} \approx 2.7 \times 10^{-4}$) indicates that it falls within the radiatively inefficient accretion flow (RIAF) state. We provide direct imaging evidence for an AGN in the northern core of UGC 2369S, revealing a deeply buried, jet-emitting low-luminosity AGN (LLAGN) enshrouded by a Compton-thick gas cocoon. This demonstrates that VLBI is a uniquely effective tool for disentangling nuclear accretion and feedback processes within the heavily obscured environments of multiple-merger systems.

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

0 major / 2 minor

Summary. The manuscript reports archival EVN (1.6 GHz) and VLBA (1.7 and 5 GHz) observations of the triple-merger LIRG UGC 2369S. Using high-resolution imaging and visibility-domain Gaussian modeling, it detects a compact radio component at the northern core with brightness temperature Tb > 10^7 K and spectral index α ≈ -0.45, which is interpreted as direct evidence for a buried low-luminosity AGN in a Compton-thick environment; the derived sub-Eddington accretion rate λ_Edd ≈ 2.7 × 10^{-4} places it in the RIAF regime.

Significance. If the interpretation holds, the result is significant because it supplies direct radio confirmation of an obscured AGN in a heavily dust-enshrouded late-stage merger where optical/IR diagnostics are ineffective. The application of established VLBI brightness-temperature and spectral-index thresholds to archival data constitutes a clear observational strength without introduction of non-standard assumptions.

minor comments (2)
  1. [Abstract] Abstract and Results: the spectral index α ≈ -0.45 is reported without stating the exact frequency baseline(s) over which it is measured; this should be added for reproducibility.
  2. [Methods] Methods/Results: the visibility-domain Gaussian modeling is mentioned but the fitted component sizes, fluxes, and the precise formula or upper-limit size used to obtain the Tb > 10^7 K lower limit are not tabulated; a short table of fit parameters would strengthen verifiability.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive summary and significance assessment of our work, which correctly captures the VLBI detection of a compact, high-Tb source with flat spectrum in the northern core of UGC 2369S and its interpretation as a buried LLAGN. The recommendation for minor revision is noted. No specific major comments were provided in the report.

Circularity Check

0 steps flagged

No significant circularity identified

full rationale

The paper reports direct VLBI imaging and visibility-domain Gaussian modeling of archival EVN and VLBA data, yielding an observed compact component whose Tb > 10^7 K and α ≈ -0.45 are interpreted via standard literature thresholds for AGN versus star-formation. No equations reduce a claimed prediction to a fitted input, no self-citation chain supplies the uniqueness of the diagnostic, and no ansatz or renaming is introduced. The central claim is therefore an application of externally established observables rather than an internally closed derivation.

Axiom & Free-Parameter Ledger

2 free parameters · 1 axioms · 0 invented entities

The central claim rests on standard domain assumptions in interpreting radio observations of galaxies and measured parameters from the data.

free parameters (2)
  • spectral index = -0.45
    Derived from 1.6, 1.7, and 5 GHz data to characterize the spectrum.
  • Eddington ratio = 2.7e-4
    Calculated to determine accretion state.
axioms (1)
  • domain assumption Brightness temperature above 10^7 K indicates AGN activity rather than star formation
    Standard assumption in radio astronomy for compact sources.

pith-pipeline@v0.9.1-grok · 5840 in / 1231 out tokens · 35458 ms · 2026-07-02T09:42:39.533008+00:00 · methodology

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