Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21533606d&link_type=abstract
American Astronomical Society, AAS Meeting #215, #336.06; Bulletin of the American Astronomical Society, Vol. 42, p.440
Other
Scientific paper
The study of the spins of individual supermassive black holes is in its infancy. One way that black hole spin can be determined and studied is by combining the radio properties and black hole mass of an AGN. Quantities such as the outflow energy or beam power of a radio source are combined with the black hole mass to study the spin of the black hole and other parameters that describe the AGN. The methods have been applied to samples of 19 FRII galaxies, 7 FRII quasars, and 29 central dominant galaxies. It was found that both the FRII galaxies and quasars have black hole spins that are of order unity at a redshift of about two; the spin values tend to decrease with redshift, and the radio galaxies have spin values of about 0.7 at low redshift. The central dominant galaxies studied have black hole spins that range from about 0.1 to 0.8, and all of these sources are at relatively low redshift. The outflow energy per unit black hole mass per outflow event, which has implications for AGN feedback, is very similar for all of the FRII galaxies studied and has a weighted mean value of about (1.8 ± 0.15) x 10-3, corresponding to a model-independent minimum black hole spin of 0.12 ± 0.01, whereas a range of values for these quantities was obtained for the FRII quasars studied. Results obtained with the different samples and the implications of these results will be presented and discussed.
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