The slimming effect of advection on black-hole accretion flows - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2016

The slimming effect of advection on black-hole accretion flows

Résumé

Context. At super-Eddington rates accretion flows onto black holes have been described as slim (aspect ratio H/R ≲ 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.

Dates et versions

hal-01311068 , version 1 (03-05-2016)

Identifiants

Citer

J.-P. Lasota, R. S. S. Vieira, A. Sadowski, R. Narayan, M. A. Abramowicz. The slimming effect of advection on black-hole accretion flows. Astronomy and Astrophysics - A&A, 2016, 587, pp.A13. ⟨10.1051/0004-6361/201527636⟩. ⟨hal-01311068⟩
148 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More