Mass and spin co-evolution during the alignment of a black hole in a warped accretion disc.
In: Monthly Notices of the Royal Astronomical Society, Jg. 399 (2009-11-11), Heft 4, S. 2249-2263
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Zugriff:
In this paper, we explore the gravitomagnetic interaction of a black hole (BH) with a misaligned accretion disc to study BH spin precession and alignment jointly with BH mass MBH and spin parameter a evolution, under the assumption that the disc is continually fed, in its outer region, by matter with angular momentum fixed on a given direction . We develop an iterative scheme based on the adiabatic approximation to study the BH–disc co-evolution: in this approach, the accretion disc transits through a sequence of quasi-steady warped states (Bardeen–Petterson effect) and interacts with the BH until the spin aligns with . For a BH aligning with a corotating disc, the fractional increase in mass is typically less than a few per cent, while the spin modulus can increase up to a few tens of per cent. The alignment time-scale is of for a maximally rotating BH accreting at the Eddington rate. BH–disc alignment from an initially counter-rotating disc tends to be more efficient compared to the specular corotating case due to the asymmetry seeded in the Kerr metric: counter-rotating matter carries a larger and opposite angular momentum when crossing the innermost stable orbit, so that the spin modulus decreases faster and so the relative inclination angle. [ABSTRACT FROM AUTHOR]
Titel: |
Mass and spin co-evolution during the alignment of a black hole in a warped accretion disc.
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Autor/in / Beteiligte Person: | Perego, A. ; Dotti, M. ; Colpi, M. ; Volonteri, M. |
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Zeitschrift: | Monthly Notices of the Royal Astronomical Society, Jg. 399 (2009-11-11), Heft 4, S. 2249-2263 |
Veröffentlichung: | 2009 |
Medientyp: | academicJournal |
ISSN: | 0035-8711 (print) |
DOI: | 10.1111/j.1365-2966.2009.15427.x |
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