Disk Powered by a Black Hole

Details Disk Powered by a Black Hole Disk Powered by a Black Hole

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001chfe.sympe...7l&link_type=abstract

Chandra Fellows Symposium 2001, held 15 October, 2001 at Harvard-Smithsonian Center for Astrophysics, meeting abstract.

Astronomy and Astrophysics

Astrophysics

Scientific paper

When a Kerr black hole is connected to a disk rotating around it by a magnetic field, the rotational energy of the Kerr black hole provides an energy source for the radiation of the disk in addition to disk accretion. If the black hole rotates faster than the disk, energy and angular momentum are extracted from the black hole and transfered to the disk. The energy deposited into the disk is eventually radiated away by the disk, which will increase the efficiency of the disk. Interestingly, a disk magnetically coupled to a rapidly rotating black hole can radiate without accretion. For such a non-accretion disk the radial radiation profile is very different from that of a standard accretion disk: the emissivity index is significantly bigger, most radiation comes from a region which is closer to the center of disk. Possible relevance of the model to observations will be briefly discussed.

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