Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21331602k&link_type=abstract
American Astronomical Society, AAS Meeting #213, #316.02; Bulletin of the American Astronomical Society, Vol. 41, p.293
Astronomy and Astrophysics
Astronomy
Scientific paper
We investigate the origin of the intrinsic scatter in the correlation betweenblack hole mass and bulge luminosity for local type 1 AGNs (z < 0.35). The bulge photometry comes from accurate two-dimensional decomposition of HST images, and the black hole masses are estimated from optical spectra using the virial method. We find that the zero point of the relation is smaller than that for inactive galaxies by 0.3 dex in black hole mass. Moreover, the zero point is correlated with various properties of the AGN and host galaxy. At a given bulge luminosity, objects with higher Eddington ratios, more disturbed morphologies, and stronger radio emission tend to have lower black hole masses. We propose that the zero point offsets, which are responsible for the intrinsic scatter of the relation, are caused by two effects: (1) a change in the normalization of the virial product used to estimate black hole mass and (2) modest BH growth during the AGN phase mediated by galaxy mergers and tidal interactions.
Barth Aaron J.
Ho Luis C.
Im Myungshin
KIM Minjin
Martini Paul
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