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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

The slimming effect of advection on black-hole accretion flows

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Autor(es):
Lasota, J. -P. [1, 2, 3] ; Vieira, R. S. S. [4, 1] ; Sadowski, A. [5] ; Narayan, R. [6] ; Abramowicz, M. A. [1, 7]
Número total de Autores: 5
Afiliação do(s) autor(es):
[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
Número total de Afiliações: 7
Tipo de documento: Artigo Científico
Fonte: Astronomy & Astrophysics; v. 587, MAR 2016.
Citações Web of Science: 15
Resumo

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)

Processo FAPESP: 10/00487-9 - Estudo dinâmico de sistemas autogravitantes newtonianos e pós-newtonianos com matéria escura
Beneficiário:Ronaldo Savioli Sumé Vieira
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 15/10577-9 - Caos e integrabilidade em discos galácticos
Beneficiário:Ronaldo Savioli Sumé Vieira
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 13/01001-0 - Um estudo dinâmico da esfera de captura de Eddington
Beneficiário:Ronaldo Savioli Sumé Vieira
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Doutorado