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26 April 2024 |
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Article overview
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A Local Baseline of the Black Hole Mass Scaling Relations for Active Galaxies. I. Methodology and Results of Pilot Study | | Vardha Nicola Bennert
; Matthew W. Auger
; Tommaso Treu
; Jong-Hak Woo
; Matthew A. Malkan
; | | Date: |
26 Aug 2010 | | Abstract: | We present high-quality Keck/LRIS longslit spectroscopy of a pilot sample of
25 local active galaxies selected from the SDSS (0.02<z<0.1; MBH>10^7 M_sun) to
study the relations between black hole mass (MBH) and host-galaxy properties.
We determine stellar kinematics of the host galaxy with an unprecedented level
of spatial resolution, deriving stellar-velocity dispersion profiles and
rotation curves from three spectral regions (including CaH&K, MgIb triplet, and
CaII triplet). In addition, we perform surface photometry on SDSS images, using
a newly developed code for joint multi-band analysis. BH masses are estimated
from the width of the Hbeta emission line and the host-galaxy free 5100A AGN
luminosity. Combining results from spectroscopy and imaging allows us to study
four MBH scaling relations: MBH-sigma, MBH-L(sph), MBH-M(sph,*),
MBH-M(sph,dyn). We find the following results. First, stellar-velocity
dispersions determined from aperture spectra (e.g. SDSS fiber spectra or
unresolved data from distant galaxies) can be biased, depending on aperture
size, AGN contamination, and host-galaxy morphology. However, such a bias
cannot explain the offset seen in the MBH-sigma relation at higher redshifts.
Second, while the CaT region is the cleanest to determine stellar-velocity
dispersions, both the MgIb region, corrected for FeII emission, and the CaHK
region, although often swamped by the AGN powerlaw continuum and emission
lines, can give results accurate to within a few percent. Third, the MBH
scaling relations of our pilot sample agree in slope and scatter with those of
other local active and inactive galaxies. In the next papers of the series we
will quantify the scaling relations, exploiting the full sample of ~100
objects. | | Source: | arXiv, 1008.4602 | | Services: | Forum | Review | PDF | Favorites | |
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