Astrophys. J., 835, 208-208 (2017/February-1)
A black hole mass determination for the compact galaxy Mrk 1216.
WALSH J.L., VAN DEN BOSCH R.C.E., GEBHARDT K., YILDIRIM A., GULTEKIN K., HUSEMANN B. and RICHSTONE D.O.
Abstract (from CDS):
Mrk 1216 is a nearby, early-type galaxy with a small effective radius of 2.8 kpc and a large stellar velocity dispersion of 308 km s–1 for its K-band luminosity of 1.4×1011 L☉. Using integral field spectroscopy assisted by adaptive optics from Gemini North, we measure spatially resolved stellar kinematics within ∼450 pc of the galaxy nucleus. The galaxy exhibits regular rotation with velocities of ±180 km s–1 and a sharply peaked velocity dispersion profile that reaches 425 km s–1 at the center. We fit axisymmetric, orbit-based dynamical models to the combination of these high angular resolution kinematics, large-scale kinematics extending to roughly three effective radii, and Hubble Space Telescope imaging, resulting in a constraint of the mass of the central black hole in Mrk 1216. After exploring several possible sources of systematics that commonly affect stellar-dynamical black hole mass measurements, we find a black hole mass of MBH=(4.9±1.7)×109 M☉ and an H-band stellar mass-to-light ratio of ΥH=1.3±0.4 Υ☉ (1σ uncertainties). Mrk 1216 is consistent with the local black hole mass-stellar velocity dispersion relation, but is a factor of ∼5-10 larger than expectations from the black hole mass-bulge luminosity and black hole mass-bulge mass correlations when conservatively using the galaxy's total luminosity or stellar mass. This behavior is quite similar to the extensively studied compact galaxy NGC 1277. Resembling the z∼2 quiescent galaxies, Mrk 1216 may be a passively evolved descendant, and perhaps reflects a previous era when galaxies contained over-massive black holes relative to their bulge luminosities/masses, and the growth of host galaxies had yet to catch up.
© 2017. The American Astronomical Society. All rights reserved.
black hole physics - galaxies: elliptical and lenticular, cD - galaxies: individual: Mrk 1216 - galaxies: kinematics and dynamics - galaxies: nuclei - galaxies: nuclei
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<Available at CDS (J/ApJ/835/208): table1.dat>
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