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arxiv: 2606.28512 · v1 · pith:T262MPR6new · submitted 2026-06-26 · 🌌 astro-ph.HE · astro-ph.GA

Dual AGN and Multiple SMBH Systems in the Era of SKAO

Q. D'Amato , L. Cui , R. Deane , S. Komossa , C. Pillay , A. Tripathi , P. Kharb , H. Guo
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S. Nandi K. Rubinur S. Anton T. An S. Bonoli N. Chang R. Dave A. De Rosa M. Habouzit F. Mannucci I. Prandoni P. Severgnini M. Scialpi C. Spingola C. Vignali W. Xu X. Yan Y. Zhang
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Pith reviewed 2026-06-30 01:14 UTC · model grok-4.3

classification 🌌 astro-ph.HE astro-ph.GA
keywords dual AGNSMBH binariesSKAOradio interferometryVLBIgravitational wavesSMBH pairingmerger feedback
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The pith

The SKAO will enable the first comprehensive radio census of dual and binary supermassive black hole systems from the nearby universe to the epoch of reionization.

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

This review explains that current radio observations cannot fully identify dual active galactic nuclei and supermassive black hole binaries because of insufficient sensitivity, resolution, and sky coverage. High-resolution radio imaging through very long baseline interferometry provides a dust-unbiased way to separate AGN emission from star formation and to track multiple accreting black holes across scales from tens of kiloparsecs down to sub-parsecs. The authors argue that the Square Kilometre Array Observatory's combination of sensitivity, survey speed, imaging fidelity, and angular resolution removes these barriers. The resulting large samples would connect electromagnetic detections with gravitational-wave observations from LISA and pulsar timing arrays. This would yield a statistically significant record of black hole pairing, accretion, and merger feedback across cosmic time.

Core claim

SKAO will overcome current observational limitations through its unprecedented combination of sensitivity, survey speed, imaging fidelity and angular resolution, enabling the discovery and characterization of dual and binary SMBHs from the nearby Universe to the epoch of reionization and providing a statistically significant view of SMBH pairing, accretion, and merger-driven feedback throughout cosmic history.

What carries the argument

High-resolution radio imaging via very long baseline interferometry (VLBI) that disentangles AGN-related emission from star formation and traces multiple accreting SMBHs from tens of kpc to sub-parsec scales.

If this is right

  • Radio follow-up of optically or infrared-selected dual AGN candidates becomes feasible at high redshift and large numbers.
  • Blind radio surveys can directly select dual AGN without requiring prior multi-wavelength identification.
  • Compact bound SMBHBs can be monitored in tandem with low-frequency gravitational wave signals.
  • Merger-driven feedback effects on host galaxies can be traced statistically across cosmic epochs.

Where Pith is reading between the lines

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

  • The approach would allow direct comparison of observed dual AGN fractions with predictions from galaxy merger simulations.
  • Multi-messenger datasets combining SKAO positions with LISA waveforms could constrain binary orbital evolution models.
  • Synergies with JWST and Euclid could reveal whether radio selection uncovers populations missed at other wavelengths.

Load-bearing premise

The SKAO will deliver its projected sensitivity, angular resolution, survey speed and imaging fidelity without major unforeseen technical or performance shortfalls.

What would settle it

Early SKAO survey data that fail to resolve or detect dual AGN systems at the rates and scales expected from current projections would indicate the performance assumptions do not hold.

Figures

Figures reproduced from arXiv: 2606.28512 by A. De Rosa, A. Tripathi, C. Pillay, C. Spingola, C. Vignali, F. Mannucci, H. Guo, I. Prandoni, K. Rubinur, L. Cui, M. Habouzit, M. Scialpi, N. Chang, P. Kharb, P. Severgnini, Q. D'Amato, R. Dave, R. Deane, S. Anton, S. Bonoli, S. Komossa, S. Nandi, T. An, W. Xu, X. Yan, Y. Zhang.

Figure 1
Figure 1. Figure 1: Projected separations of all spectroscopically confirmed high-𝑧 DAGN, identified at projected separation ≤ 30 kpc and in the 0.5 ≤ 𝑧 ≤ 3.5 range. Updated from Mannucci et al. (2023). 4 [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Number of DAGN per deg2 as a function of redshift, for a number of hydrodynamical simulations. The thick black solid line is the mean of the simulations, while the gray area is the standard deviation. The thick red solid is the expected flux density at 1.4 GHz for a 𝐿bol = 1043 erg/s AGN. The grey dashed horizontal line is the 5𝜎 detection threshold for the deep reference survey of ∼ 1 deg2 at 1.4 GHz prop… view at source ↗
Figure 3
Figure 3. Figure 3: Predicted sky density of RL DAGN per square degree identifiable with SKA AA* (left) and AA4 (right), based on the SIMBA cosmological hydrodynamical simulations. Lines correspond to observation times of 10 minutes (dashed) and 1 hour (dotted) for SKA Bands 1 (yellow), 2 (orange), 5a (purple), and 5b (black). Figure adapted from Pillay et al. (2026). in SIMBA simulation was found to be more pronounced due to… view at source ↗
read the original abstract

We present a radio-oriented review of current strategies for the detection and characterization of dual active galactic nuclei (DAGN) and supermassive black hole binaries (SMBHBs), emphasizing the crucial role of radio interferometry in advancing this field. We discuss how high-resolution radio imaging - particularly through very long baseline interferometry (VLBI) - provides a unique, dust-unbiased tool to identify multiple accreting SMBHs, disentangle AGN-related emission from star formation, and trace components from tens of kpc to sub-parsec scales. We summarize current observational limitations, such as insufficient sensitivity-resolution combination and area coverage. We then outline how the SKAO will overcome these constraints through its unprecedented combination of sensitivity, survey speed, imaging fidelity and angular resolution, enabling the discovery and characterization of dual and binary SMBHs from the nearby Universe to the epoch of reionization. Several science cases are presented, including radio follow-ups of optical/infrared-selected DAGN, direct blind radio selection of DAGN, studies of compact bound SMBHBs, and the link between SMBHB orbital evolution and low-frequency gravitational wave emission. We further emphasize the synergy between SKAO observations and modern and upcoming facilities such as the James Webb and Euclid space telescopes, Rubin Observatory, and gravitational wave detectors including the Laser Interferometer Space Antenna and pulsar timing arrays. These combined capabilities will allow SKAO to enable the first comprehensive radio census of dual and binary SMBH systems, bridge the gap between electromagnetic and gravitational wave observations, and provide a statistically significant view of SMBH pairing, accretion, and merger-driven feedback throughout cosmic history.

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 / 0 minor

Summary. The manuscript is a radio-oriented review of strategies for detecting and characterizing dual active galactic nuclei (DAGN) and supermassive black hole binaries (SMBHBs). It emphasizes the role of VLBI for dust-unbiased identification across scales from tens of kpc to sub-parsec, summarizes current limitations in sensitivity-resolution combination and area coverage, and projects how SKAO will overcome these via its sensitivity, survey speed, imaging fidelity, and angular resolution. Science cases include radio follow-ups of optical/IR-selected DAGN, blind radio selection, studies of compact bound SMBHBs, and links to low-frequency gravitational wave emission, with synergies noted to JWST, Euclid, Rubin, LISA, and pulsar timing arrays to enable a comprehensive census from the local Universe to reionization.

Significance. If the projections hold, the review will be a useful reference for planning SKAO observations in this field. It synthesizes existing approaches and explicitly highlights the potential for radio data to bridge electromagnetic and gravitational-wave observations, providing a statistically significant view of SMBH pairing, accretion, and merger-driven feedback. The discussion of multi-facility synergies is a strength for guiding community efforts.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive assessment of the manuscript, recognition of its utility as a reference for SKAO planning, and recommendation to accept. No major comments were raised.

Circularity Check

0 steps flagged

No significant circularity; review paper with no derivations

full rationale

The manuscript is a forward-looking review summarizing observational strategies for dual AGN/SMBH binaries and projecting SKAO capabilities. It contains no equations, models, fitted parameters, or derivation chains. All claims are conditional on published SKAO design goals and cite external literature for current limitations and synergies. No self-citation load-bearing steps, self-definitional constructs, or renamed results are present. The central statements reduce to standard review structure rather than any internal reduction to inputs.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The paper is a review and introduces no free parameters, axioms, or invented entities. It relies on established astrophysical concepts and publicly stated SKAO instrument specifications.

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