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Energy flows in thick accretion discs and their consequences for black hole feedback

Författare och institution:
A. Sadowski (-); J. P. Lasota (-); Marek A Abramowicz (Institutionen för fysik (GU)); R. Narayan (-)
Publicerad i:
Monthly Notices of the Royal Astronomical Society, 456 ( 4 ) s. 3915-3928
ISSN:
0035-8711
Publikationstyp:
Artikel, refereegranskad vetenskaplig
Publiceringsår:
2016
Språk:
engelska
Fulltextlänk:
Fulltextlänk (lokalt arkiv):
Sammanfattning (abstract):
We study energy flows in geometrically thick accretion discs, both optically thick and thin, using general relativistic, three-dimensional simulations of black hole accretion flows. We find that for non-rotating black holes the efficiency of the total feedback from thick accretion discs is 3 per cent - roughly half of the thin disc efficiency. This amount of energy is ultimately distributed between outflow and radiation, the latter scaling weakly with the accretion rate for super-critical accretion rates, and returned to the interstellar medium. Accretion on to rotating black holes is more efficient because of the additional extraction of rotational energy. However, the jet component is collimated and likely to interact only weakly with the environment, whereas the outflow and radiation components cover a wide solid angle.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
NATURVETENSKAP ->
Fysik ->
Astronomi, astrofysik och kosmologi
Nyckelord:
accretion, accretion discs, black hole physics, relativistic processes, methods: numerical, ADVECTION-DOMINATED ACCRETION, X-RAY BINARIES, MAGNETIC-FLUX, RELATIVISTIC MAGNETOHYDRODYNAMICS, ELECTROMAGNETIC EXTRACTION, DIFFUSION-COEFFICIENTS, NUMERICAL-SIMULATION, GENERAL-RELATIVITY, VERTICAL STRUCTURE, DISKS
Postens nummer:
234954
Posten skapad:
2016-04-20 16:57
Posten ändrad:
2016-05-04 15:18

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