Binary black holes in magnetized disks of active galactic nuclei

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19630%2F25%3AA0000482" target="_blank" >RIV/47813059:19630/25:A0000482 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.aanda.org/articles/aa/full_html/2025/11/aa55874-25/aa55874-25.html" target="_blank" >https://www.aanda.org/articles/aa/full_html/2025/11/aa55874-25/aa55874-25.html</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202555874" target="_blank" >10.1051/0004-6361/202555874</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Binary black holes in magnetized disks of active galactic nuclei

Popis výsledku v původním jazyce

Stellar-mass binary black hole (BBH) mergers that occur within the disks of active galactic nuclei (AGN) are promising sources for gravitational waves that can be detected by the LIGO, Virgo, and KAGRA interferometers. Some of these events have also been potentially associated with transient electromagnetic flares, indicating that BBH mergers in dense environments may be promising sources of multimessenger signals. To investigate the prospects for electromagnetic emission from these systems, we studied the dynamics of accretion flows onto BBHs that are embedded in AGN disks with numerical simulations. Although recent studies have explored this scenario, they often employed simplified disk models that neglected magnetic fields. We examined how strong magnetic fields affect and regulate the accretion onto these binary systems. In this context, we conducted three-dimensional magnetohydrodynamical local shearing-box simulations of a BBH system embedded within a magnetized disk of an AGN. The dynamically important magnetic fields can drive the formation of well-collimated outflows that can penetrate the vertical extent of the AGN disk. The outflow generation is not ubiquitous, however, and strongly depends on the radial distance of the binary from the supermassive black hole (SMBH). In particular, binaries placed at a larger distance from the central SMBH show a relatively stronger transient accretion and the formation of stronger spiral shocks. Furthermore, the accretion behavior onto the binary system via individual circum-singular disks is also modulated by local AGN disk properties. Our simulations highlight the importance of the shear velocity in the amplification of the toroidal magnetic field component, which plays a crucial role in governing the outflow strength.

Název v anglickém jazyce

Binary black holes in magnetized disks of active galactic nuclei

Popis výsledku anglicky

Stellar-mass binary black hole (BBH) mergers that occur within the disks of active galactic nuclei (AGN) are promising sources for gravitational waves that can be detected by the LIGO, Virgo, and KAGRA interferometers. Some of these events have also been potentially associated with transient electromagnetic flares, indicating that BBH mergers in dense environments may be promising sources of multimessenger signals. To investigate the prospects for electromagnetic emission from these systems, we studied the dynamics of accretion flows onto BBHs that are embedded in AGN disks with numerical simulations. Although recent studies have explored this scenario, they often employed simplified disk models that neglected magnetic fields. We examined how strong magnetic fields affect and regulate the accretion onto these binary systems. In this context, we conducted three-dimensional magnetohydrodynamical local shearing-box simulations of a BBH system embedded within a magnetized disk of an AGN. The dynamically important magnetic fields can drive the formation of well-collimated outflows that can penetrate the vertical extent of the AGN disk. The outflow generation is not ubiquitous, however, and strongly depends on the radial distance of the binary from the supermassive black hole (SMBH). In particular, binaries placed at a larger distance from the central SMBH show a relatively stronger transient accretion and the formation of stronger spiral shocks. Furthermore, the accretion behavior onto the binary system via individual circum-singular disks is also modulated by local AGN disk properties. Our simulations highlight the importance of the shear velocity in the amplification of the toroidal magnetic field component, which plays a crucial role in governing the outflow strength.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GX21-06825X" target="_blank" >GX21-06825X: Akreující černé díry v nové éře polarizačních rentgenových misí</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

ASTRONOMY & ASTROPHYSICS

ISSN

0004-6361

e-ISSN

—

Svazek periodika

703

Číslo periodika v rámci svazku

November 2025

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

14

Strana od-do

„A304-1“-„A304-14“

Kód UT WoS článku

001624330200011

EID výsledku v databázi Scopus

2-s2.0-105022921552