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L. Watson, F. Hamann (Univ. of Florida), M. Dietrich (Ohio State University), C. Warner (Univ. of Florida)
Supermassive black hole (SMBH) mass has been shown to scale directly with host galaxy mass in both active and inactive galaxies. Galactic metallicities are also known to increase with galaxy mass. However, these relationships have been established only in the "local" universe (at redshifts z<0.1). We report some preliminary results from a program to examine these relationships at higher redshifts and make comparisons across cosmic time. In particular, we compare SMBH masses (derived from H-beta) to host galaxy masses (derived from HST images) for a sample of ~15 AGNs at z~0.4 that span more than a factor of ten in AGN luminosity. We also compare H-beta and CIV 1550 estimates of the SMBH mass to test the viability of each, and we make the first direct comparisons between the gas-phase metallicities of AGN (based on emission line ratios) and the host galaxy masses. Our results will help test previous claims that AGN metallicities scale directly with the masses of both the central SMBH and the host galaxy.
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Bulletin of the American Astronomical Society, 37 #2
© 2005. The American Astronomical Soceity.