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The Effect of Thermal Torques on AGN Disc Migration Traps and Gravitational Wave Populations by Grishin, Evgeni; Gilbaum, Shmuel; Stone, Nicholas C. is a scholarly article available to read on EtoBox.

What is The Effect of Thermal Torques on AGN Disc Migration Traps and Gravitational Wave Populations about?

Accretion discs in active galactic nuclei (AGN) foster black hole (BH) formation, growth, and mergers. Stellar mass BHs migrate inwards under the influence of hydrodynamical torques unless they encounter a region where the torque flips sign. At these migration traps, BHs accumulate and merge via dynamical or gas-assisted interactions, producing high-frequency LIGO/Virgo/KAGRA (LVK) gravitational wave (GW) sources and potentially cutting off the supply of extreme mass ratio inspirals that would otherwise make low-frequency, {\it LISA}-band GWs. In this paper, we study the interplay between different types of migration torques, focusing especially on the ``thermal torques'' generated by the thermal response of the AGN to embedded stellar-mass BHs that accrete through their own mini-discs.In contrast to previous work, we find that Type I torques cannot produce migration traps on their own, but thermal torques often do, particularly in low-mass AGN. The migration traps produced by thermal torques exist at much larger radii ($\sim 10^{3-5}$ gravitational radii) than do previously identified Type I traps, carrying implications for GW populations at multiple frequencies. Finally, we ident

Author

Grishin, Evgeni; Gilbaum, Shmuel; Stone, Nicholas C.

Published

2023

Language

EN