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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The slimming effect of advection on black-hole accretion flows

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Author(s):
Lasota, J. -P. [1, 2, 3] ; Vieira, R. S. S. [1, 4] ; Sadowski, A. [5] ; Narayan, R. [6] ; Abramowicz, M. A. [7, 1]
Total Authors: 5
Affiliation:
[1] Nicolaus Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw - Poland
[2] CNRS, Inst Astrophys Paris, 98Bis Bd Arago, F-75014 Paris - France
[3] Univ Paris 06, Univ Paris 04, UMR 7095, 98Bis Bd Arago, F-75014 Paris - France
[4] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 Sao Paulo, SP - Brazil
[5] MIT Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 - USA
[6] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 - USA
[7] Gothenburg Univ, Dept Phys, S-41296 Gothenburg - Sweden
Total Affiliations: 7
Document type: Journal article
Source: Astronomy & Astrophysics; v. 587, MAR 2016.
Web of Science Citations: 15
Abstract

Context. At super-Eddington rates accretion flows onto black holes have been described as slim (aspect ratio H/R less than or similar to 1) or thick (H/R > 1) discs, also known as tori or (Polish) doughnuts. The relation between the two descriptions has never been established, but it was commonly believed that at sufficiently high accretion rates slim discs inflate, becoming thick. Aims. We wish to establish under what conditions slim accretion flows become thick. Methods. We use analytical equations, numerical 1 + 1 schemes, and numerical radiative MHD codes to describe and compare various accretion flow models at very high accretion rates. Results. We find that the dominant effect of advection at high accretion rates precludes slim discs becoming thick. Conclusions. At super-Eddington rates accretion flows around black holes can always be considered slim rather than thick. (AU)

FAPESP's process: 10/00487-9 - Dynamical study of Newtonian and Post-Newtonian self-gravitating systems with dark matter
Grantee:Ronaldo Savioli Sumé Vieira
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 15/10577-9 - Chaos and integrability in galactic disks
Grantee:Ronaldo Savioli Sumé Vieira
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/01001-0 - A dynamical study of the Eddington capture sphere
Grantee:Ronaldo Savioli Sumé Vieira
Support type: Scholarships abroad - Research Internship - Doctorate