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Black Holes and Host Galaxies of NLS1s
Recently, reliable mass estimates for the central black holes in AGN became
feasible due to emission-line reverberation techniques. Using this method as a
calibrator, it is possible to determine black hole masses for a wide range of
AGN, in particular NLS1s. Do NLS1s have smaller black holes than ordinary
Seyfert 1 galaxies? Are their black holes smaller compared to the sizes of
their host galaxies? Do they have larger L/M ratios? Do NLS1s have hotter
accretion disks? I confront these questions with accretion disk theory and with
the data, showing that the above may well be the case.Comment: Contributed talk presented at the Joint MPE,AIP,ESO workshop on
NLS1s, Bad Honnef, Dec. 1999, to appear in New Astronomy Reviews; also
available at http://wave.xray.mpe.mpg.de/conferences/nls1-worksho
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