Black Holes in Big Galaxies with Small Bulges

Details Black Holes in Big Galaxies with Small Bulges Black Holes in Big Galaxies with Small Bulges

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9776r&link_type=abstract

HST Proposal ID #9776

Physics

Hst Proposal Id #9776 Galaxies

Scientific paper

In early-type galaxies the black hole {BH} mass is tightly correlated with the bulge velocity dispersion. This correlation suggests that the BH mass is determined by local processes in the central part of the galaxy. However, the bulge dispersion in these galaxies is correlated with the disk circular speed which in turn correlates with the inferred halo circular speed {the "disk-halo conspiracy"}. For this reason, existing data cannot decide whether the BH mass is set by the bulge dispersion or the disk or halo circular speed. We propose to break this degeneracy by weighing the BH in 3 Sc galaxies in which the ratio of bulge circular speed to bulge velocity dispersion is large, leading to large differences between BH masses predicted from these quantities. These measurements will increase the number of carefully studied Sc bulges from one to four and will determine whether the masses of nuclear BHs are set by {presumably baryonic} processes in galaxy bulges or by {presumably non-baryonic} processes in their dark halos.

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