Kavli Affiliate: Luis C. Ho
| First 5 Authors: Suyeon Son, Minjin Kim, Aaron J. Barth, Luis C. Ho,
| Summary:
Using $I$-band images of 35 nearby ($z<0.1$) type 1 active galactic nuclei
(AGNs) obtained with Hubble Space Telescope, selected from the 70-month
Swift-BAT X-ray source catalog, we investigate the photometric properties of
the host galaxies. With a careful treatment of the point-spread function (PSF)
model and imaging decomposition, we robustly measure the $I$-band brightness
and the effective radius of bulges in our sample. Along with black hole (BH)
mass estimates from single-epoch spectroscopic data, we present the relation
between BH mass and $I$-band bulge luminosity ($M_{rm BH}-M_{I,rm bul}$
relation) of our sample AGNs. We find that our sample lies offset from the
$M_{rm BH}-M_{I,rm bul}$ relation of inactive galaxies by 0.4 dex, i.e., at a
given bulge luminosity, the BH mass of our sample is systematically smaller
than that of inactive galaxies. We also demonstrate that the zero point offset
in the $M_{rm BH}-M_{I,rm bul}$ relation with respect to inactive galaxies is
correlated with the Eddington ratio. Based on the Kormendy relation, we find
that the mean surface brightness of ellipticals and classical bulges in our
sample is comparable to that of normal galaxies, revealing that bulge
brightness is not enhanced in our sample. As a result, we conclude that the
deviation in the $M_{rm BH}-M_{I,rm bul}$ relation from inactive galaxies is
possibly because the scaling factor in the virial BH mass estimator depends on
the Eddington ratio.
| Search Query: ArXiv Query: search_query=au:”Luis C. Ho”&id_list=&start=0&max_results=10