Supermassive Black Holes and Their Host Galaxies

Details Supermassive Black Holes and Their Host Galaxies Supermassive Black Holes and Their Host Galaxies

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003noao.prop...67p&link_type=abstract

NOAO Proposal ID #2003A-0067

Physics

Scientific paper

Our hopes of understanding the nature of the connection between supermassive black holes (BHs) and their host galaxies have recently been kindled by the discovery that BH mass, and the stellar velocity dispersion of the surrounding bulge, follow a remarkably tight relation, M_BH ∝ σ^ 4.5. Important parameters such as the mass density in local black holes, and the impact of galaxy merging on BH evolution, hinge critically on the exact characterization of this relation. At present, only quiescent or very weakly active galaxies define the ms relation. In 2001, we were granted 8 nights of KPNO 4-m time to test and extend the validity of the ms relation to powerful AGNs, by measuring σ in nine Seyfert 1 galaxies for which the BH mass is known from reverberation-mapping studies. We now turn our attention to the southern-hemisphere AGNs for which reverberation-based masses have been obtained; we request one night two observe two Seyfert galaxies, NGC 3783 and IC 4329A. Stellar velocity dispersions will be measured from high S/N ( 50), moderate resolution ( 5000) long slit spectra of the CaII absorption triplet.

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