高能暂现源 · 每日文献综述

The detection of GW231123, a gravitational-wave (GW) event with exceptionally massive and rapidly spinning black holes, suggests the possible formation within an active galactic nucleus (AGN) disk, which provides a favorable environment for potentially generating an observable electromagnetic (EM) counterpart. We conduct a search for such a counterpart by crossmatching the GW localization with a comprehensive catalog of AGN flares from the Zwicky Transient Facility. Our analysis yields six plausible optical flare candidates that are spatially and temporally coincident with GW231123 and exhibit significant deviations from their AGN baseline flux. These candidates provide a well-defined starting point for evaluating a possible EM counterpart of GW231123. To facilitate future verification, we present a set of observational diagnostics that can be used to confirm or rule out their association, enabling a more systematic exploration of the AGN formation channel in upcoming multimessenger searches.