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26 April 2024 |
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A Local Baseline of the Black Hole Mass Scaling Relations for Active Galaxies. III. The BH mass - $sigma$ relation | | Vardha N. Bennert
; Tommaso Treu
; Matthew W. Auger
; Rebecca Rosen
; Chelsea E. Harris
; Matthew A. Malkan
; Jong-Hak Woo
; | | Date: |
15 Sep 2014 | | Abstract: | We create a baseline of the black hole (BH) mass ($M_{
m BH}$) -
stellar-velocity dispersion ($sigma$) relation for active galaxies, using a
homogeneous sample of 66 Seyfert-1 galaxies in the local Universe (0.02 $< z <$
0.09) selected from the Sloan Digital Sky Survey (SDSS). A multi-filter
analysis of SDSS images yields AGN luminosities free of host-galaxy
contamination. High signal-to-noise ratio Keck spectra provide the width of the
broad H$eta$ emission line free of FeII emission and stellar absorption.
$M_{
m BH}$ is estimated following the virial method. The Keck long-slit
spectra provide spatially-resolved kinematics that is used to determine the
rotation-free stellar-velocity dispersion within the spheroid effective radius
($sigma_{
m reff}$). To probe the effect of the kinematically-cold but
rotationally-supported disk component, present in the majority of host
galaxies, on aperture sigma measurements, we determine the stellar-velocity
dispersion within an aperture of the size of the SDSS fiber ($sigma_{
m
ap}$). While for face-on objects, the effect is negligible, for edge-on
galaxies, rotational broadening causes $sigma_{
m ap}$ to be overestimated by
on average 16$pm$3%, showing the importance of spatially-resolved kinematics
for a sample of late-type galaxies. Overall, our Seyfert-1 galaxy sample
follows the same $M_{
m BH}$-$sigma$ relation as that of reverberation-mapped
active galaxies as well as quiescent galaxies, with a comparable scatter when
considering $sigma_{
m reff}$. We find evidence for host galaxies with a
spheroidal component classified as pseudo bulge to scatter less than their
classical counterparts, suggestive of secular evolution providing an efficient
and synchronized way in growing both BHs and spheroids for spiral galaxies. | | Source: | arXiv, 1409.4428 | | Services: | Forum | Review | PDF | Favorites | |
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