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 (203 Czech Republic, guarantor, belonging to the institution), David ABARCA (840 United States of America), Włodek KLUŹNIAK (616 Poland), Maciek WIELGUS (616 Poland), Aleksander SA̧DOWSKI (616 Poland), Ramesh NARAYAN (356 India), Jan SCHEE (203 Czech Republic, belonging to the institution), Gabriel TÖRÖK (203 Czech Republic, belonging to the institution) and Marek ABRAMOWICZ (616 Poland, belonging to the institution)

Edition

Astrophysical Journal Letters, 2019, 2041-8205

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

RIV identification code

RIV/47813059:19240/19:A0000443

Organization unit

Faculty of Philosophy and Science in Opava

UT WoS

000516538200010

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.
Změněno: 21/4/2020 10:35, Ing. Petra Skoumalová

Abstract

V originále

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.