ABRAMOWICZ, Marek. Spinning up black holes with super-critical accretion flows. Astronomy & Astrophysics. FR - Francouzská republika, 2011, vol. 532, A41, p. 1-11. ISSN 0004-6361. Available from: https://dx.doi.org/10.1051/0004-6361/201116702.
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Basic information
Original name Spinning up black holes with super-critical accretion flows
Authors ABRAMOWICZ, Marek.
Edition Astronomy & Astrophysics, FR - Francouzská republika, 2011, 0004-6361.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10308 Astronomy
Confidentiality degree is not subject to a state or trade secret
Organization unit Faculty of Philosophy and Science in Opava
Doi http://dx.doi.org/10.1051/0004-6361/201116702
UT WoS 000293283600052
Keywords in English Accretion, accretion disks, Black hole physics
Tags UF
Tags International impact, Reviewed
Links MSM4781305903, plan (intention).
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 8/12/2020 11:35.
Abstract
We study the process of spinning up black holes by accretion from slim disks in a wide range of accretion rates. We show that for super-Eddington accretion rates and low values of the viscosity parameter alpha (lesssim 0.01) the limiting value of the dimensionless spin parameter a_* can reach values higher than a_*=0.9978 inferred by Thorne (1974) in his seminal study. For mdot=10mdot_{Edd} and alpha=0.01 spin equilibrium is reached at a_*=0.9994. We show that the equilibrium spin value depends strongly on the assumed value of alpha. We also prove that for high accretion rates the impact of captured radiation on spin evolution is negligible.
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