J 2019

Puffy Accretion Disks: Sub-Eddington, Optically Thick, and Stable

LANČOVÁ, Debora; David ABARCA; Włodek KLUŹNIAK; Maciek WIELGUS; Aleksander SA̧DOWSKI et. al.

Basic information

Original name

Puffy Accretion Disks: Sub-Eddington, Optically Thick, and Stable

Authors

LANČOVÁ, Debora; David ABARCA; Włodek KLUŹNIAK; Maciek WIELGUS; Aleksander SA̧DOWSKI; Ramesh NARAYAN; Jan SCHEE; Gabriel TÖRÖK and Marek ABRAMOWICZ

Edition

Astrophysical Journal Letters, 2019, 2041-8205

Other information

Language

English

Type of outcome

Article in a journal

Field of Study

10308 Astronomy

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

is not subject to a state or trade secret

References:

Impact factor

Impact factor: 8.201

RIV identification code

RIV/47813059:19240/19:A0000443

Organization unit

Faculty of Philosophy and Science in Opava

UT WoS

000516538200010

EID Scopus

2-s2.0-85075292838

Keywords in English

accretion; magnetohydrodynamical simulations; general relativity; radiative magnetohydrodynamics; black holes

Tags

International impact, Reviewed

Links

GA17-16287S, research and development project. LTI17018, research and development project.
Changed: 21/4/2020 10:35, Ing. Petra Skoumalová

Abstract

In the original language

We report on a new class of solutions of black hole accretion disks that we have found through three-dimensional, global, radiative magnetohydrodynamic simulations in general relativity. It combines features of the canonical thin, slim, and thick disk models but differs in crucial respects from each of them. We expect these new solutions to provide a more realistic description of black hole disks than the slim disk model. We are presenting a disk solution for a nonspinning black hole at a sub-Eddington mass accretion rate, Mdot = 0.6 Mdot_Edd. By the density scale-height measure the disk appears to be thin, having a high density core near the equatorial plane of height h_rho ~ 0.1 r, but most of the inflow occurs through a highly advective, turbulent, optically thick, Keplerian region that sandwiches the core and has a substantial geometrical thickness comparable to the radius, H ~ r. The accreting fluid is supported above the midplane in large part by the magnetic field, with the gas and radiation to magnetic pressure ratio beta ~ 1, this makes the disk thermally stable, even though the radiation pressure strongly dominates over gas pressure. A significant part of the radiation emerging from the disk is captured by the black hole, so the disk is less luminous than a thin disk would be at the same accretion rate.