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Searching for electromagnetic emission in an AGN from the gravitational wave binary black hole merger candidate S230922g

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arxiv 2407.10698 v2 pith:SPIJ3PSA submitted 2024-07-15 astro-ph.HE astro-ph.GA

Searching for electromagnetic emission in an AGN from the gravitational wave binary black hole merger candidate S230922g

Tom\'as Cabrera , Antonella Palmese , Lei Hu , Brendan O'Connor , K.E.Saavik Ford , Barry McKernan , Igor Andreoni , Tom\'as Ahumada
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Ariel Amsellem Malte Busmann Peter Clark Michael W. Coughlin Ekaterine Dadiani Veronica Diaz Matthew J. Graham Daniel Gruen Keerthi Kunnumkai Jake Postiglione Julian S. Sommer Francisco Valdes
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We carried out long-term monitoring of the LIGO/Virgo/KAGRA binary black hole (BBH) merger candidate S230922g in search of electromagnetic emission from the interaction of the merger remnant with an embedding active galactic nuclei (AGN) accretion disk. Using a dataset primarily composed of wide-field imaging from the Dark Energy Camera (DECam) and supplemented by additional photometric and spectroscopic resources, we searched ~ 70% of the sky area probability for transient phenomena, and discovered 6 counterpart candidates. One especially promising candidate - AT 2023aagj - exhibited temporally varying asymmetric components in spectral broad line regions, a feature potentially indicative of an off-center event such as a BBH merger. This represents the first live search and multiwavelength, photometric, and spectroscopic monitoring of a GW BBH optical counterpart candidate in the disk of an AGN.

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  1. A population of LIGO-Virgo-KAGRA mergers happening inside active galactic nuclei

    astro-ph.GA 2026-07 conditional novelty 6.0

    Thirteen preferred LVK BBH–AGN associations yield cumulative ln B ≈ +81, with sky localization dominating model selection while SMBH environmental redshifts remain inconclusive.