Physics
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aps..oss.p1006k&link_type=abstract
American Physical Society, Spring 2010 Meeting of the Ohio Section of the APS Volume 55, Number 4, April 30-May 1, 2010, abstrac
Physics
Scientific paper
We present kinematics and photometry of the Elliptical galaxy NGC 4552. This is part of a program to directly measure the masses of supermassive black holes in galaxies. Our photometry is derived from V and I band CCD images from the ground and from the Hubble Space Telescope (HST). We find that fitting the 2D surface brightness distribution with parametric Sersic models does not match the light profile as well as standard ellipse fitting. The combined (HST+ground) light profile is used to find the enclosed mass profile of the galaxy. The stellar line of sight velocity distribution is measured from CaII absorption lines at 8498, 8542, and 8662 å in ground-based long-slit spectroscopy. The stellar velocity dispersion is about 300 km/s, which predicts a black hole mass of about 7x10^8 MSun. Our HST spectra of the Hα-emitting ionized gas shows ordered motion and hints of a Keplerian rotation curve. We model the system as a thin, inclined disk of gas rotating in the galaxy + black hole potential. The measured gas kinematics are best reproduced by models which include a large, central black hole mass.
Kircher Peter
Pinkney Jason
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