Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-09-07
Mon.Not.Roy.Astron.Soc.373:551-560,2006
Astronomy and Astrophysics
Astrophysics
10 pages, 6 figures. To appear in MNRAS
Scientific paper
10.1111/j.1365-2966.2006.10878.x
We report on the analysis of the photometric and spectroscopic properties of a sample of 29 low redshift (z<0.6) QSOs for which both HST WFPC2 images and ultraviolet HST FOS spectra are available. For each object we measure the R band absolute magnitude of the host galaxy, the CIV (1550A) line width and the 1350A continuum luminosity. From these quantities we can estimate the black hole (BH) mass through the M(BH)-L(bulge) relation for inactive galaxies, and from the virial method based on the kinematics of the regions emitting the broad lines. The comparison of the masses derived from the two methods yields information on the geometry of the gas emitting regions bound to the massive BH. The cumulative distribution of the line widths is consistent with that produced by matter laying in planes with inclinations uniformly distributed between 10 and 50 deg, which corresponds to a geometrical factor f=1.3. Our results are compared with those of the literature and discussed within the unified model of AGN.
Falomo Renato
Labita Marzia
Treves Aldo
Uslenghi Michela
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