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The slimming effect of advection on black-hole accretion flows

Författare och institution:
J. P. Lasota (-); R. S. S. Vieira (-); A. Sadowski (-); R. Narayan (-); Marek A Abramowicz (Institutionen för fysik (GU))
Publicerad i:
Astronomy & Astrophysics, 587 s. article no. A13
ISSN:
1432-0746
Publikationstyp:
Artikel, refereegranskad vetenskaplig
Publiceringsår:
2016
Språk:
engelska
Fulltextlänk:
Sammanfattning (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.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
NATURVETENSKAP ->
Fysik ->
Astronomi, astrofysik och kosmologi
Nyckelord:
accretion, accretion disks, black hole physics, relativistic magnetohydrodynamic simulations, super-eddington accretion, x-ray sources, dominated accretion, thick accretion, vertical structure, polish doughnuts, tidal disruption, disk model, jets
Postens nummer:
235842
Posten skapad:
2016-05-03 13:44

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