On the dynamics of misaligned accretion discs and spinning black holes

Details On the dynamics of misaligned accretion discs and spinning black holes On the dynamics of misaligned accretion discs and spinning black holes

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.9004l&link_type=abstract

American Astronomical Society Meeting 207, #90.04; Bulletin of the American Astronomical Society, Vol. 37, p.1318

Astronomy and Astrophysics

Astronomy

Scientific paper

In this contribution, I discuss the dynamics of misaligned accretion discs and spinning black holes in Active Galactic Nuclei, by using a nself-consistent time-dependent approach, that allows to properly track the evolution of the spin of the black hole during the alignment process. I show that, contrary to previous beliefs, the disc angular momentum and the black hole spin can end up counter-aligned, in such a way that accretion proceeds through retrograde orbits. I will discuss the implications that this counter-aligned mode of accretion has on observables from AGNs, such as the shape of X-ray iron lines, the shape of jets, and the possibility of obscuration of the central engine. I will also discuss, more in general, the effects of the alignment (or counter-alignment) process on the spin history of super-massive black holes.

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