The Black Hole Mass in Brightest Cluster Galaxy NGC 6086

Abstract

We present the first direct measurement of the central black hole mass, M_BH, in NGC 6086, the Brightest Cluster Galaxy (BCG) in Abell 2162. Our investigation demonstrates for the first time that stellar dynamical measurements of M_BH in BCGs are possible beyond the nearest few galaxy clusters. We observed NGC 6086 with laser guide star adaptive optics and the integral-field spectrograph (IFS) OSIRIS at the W.M. Keck Observatory, and with the seeing-limited IFS GMOS-N at Gemini Observatory North. We combined the two IFS data sets with existing major-axis kinematics, and used axisymmetric stellar orbit models to determine M_BH and the R-band stellar mass-to-light ratio, M*/L_R. We find M_BH = 3.6(+1.7)(-1.1) x 10^9 M_Sun and M*/L_R = 4.6(+0.3)(-0.7) M_Sun/L_Sun (68% confidence), from models using the most massive dark matter halo allowed within the gravitational potential of the host cluster. Models fitting only IFS data confirm M_BH ~ 3 x 10^9 M_Sun and M*/L_R ~ 4 M_Sun/L_Sun, with weak dependence on the dark matter halo structure. When data out to 19 kpc are included, the unrealistic omission of dark matter causes the best-fit black hole mass to decrease dramatically, to 0.6 x 10^9 M_Sun, and the best-fit stellar mass-to-light ratio to increase to 6.7 M_Sun/L_Sun. The latter value is at further odds with stellar population studies favoring M*/L ~ 2 M_Sun/L_Sun,R. Biases from dark matter omission could extend to dynamical models of other galaxies with central stellar cores, and new measurements of M_BH from models with dark matter could steepen the empirical scaling relationships between black holes and their host galaxies.

22 pages, 19 figures; accepted for publication in ApJ

References in corpus (12)

• K-corrections and filter transformations in the ultraviolet, optical, and near infrared
• Triaxial orbit based galaxy models with an application to the (apparent) decoupled core galaxy NGC 4365
• The Black Hole Mass, Stellar M/L, and Dark Halo in M87
• Dynamical modelling of luminous and dark matter in 17 Coma early-type galaxies
• Distinct core and halo stellar populations and the formation history of the bright Coma cluster early-type galaxy NGC 4889
• The Black Hole in NGC 3379: A Comparison of Gas and Stellar Dynamical Mass Measurements with HST and Integral-Field Data
• Spatially resolved kinematics and stellar populations of brightest cluster and group galaxies
• The supermassive black hole of Fornax A
• The High-Mass End of the Black Hole Mass Function: Mass Estimates in Brightest Cluster Galaxies
• The Black Hole Mass and Extreme Orbital Structure in NGC1399
• Radial kinematics of brightest cluster galaxies
• The supermassive black hole in NGC4486a detected with SINFONI at the VLT

Cited by in corpus (32)

• Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies
• Revisiting the Scaling Relations of Black Hole Masses and Host Galaxy Properties
• The Black-Hole Mass in M87 from Gemini/NIFS Adaptive Optics Observations
• Two ten-billion-solar-mass black holes at the centres of giant elliptical galaxies
• The (black hole mass)-(host spheroid luminosity) relation at high and low masses, the quadratic growth of black holes, and intermediate-mass black hole candidates
• Unification of the Fundamental Plane and Super-Massive Black Holes Masses
• The MASSIVE Survey - I. A Volume-Limited Integral-Field Spectroscopic Study of the Most Massive Early-Type Galaxies within 108 Mpc
• A 17-billion-solar-mass black hole in a group galaxy with a diffuse core
• Dynamical Measurements of Black Hole Masses in Four Brightest Cluster Galaxies at 100 Mpc
• Black Hole Mass Scaling Relations for Early-Type Galaxies: $M_{BH}$-$M_{\ast ,sph}$ and $M_{BH}$-$M_{\ast ,gal}$
• The Influence of Dark Matter Halos on Dynamical Estimates of Black Hole Mass: Ten New Measurements for High-sigma Early-Type Galaxies
• The Fundamental Plane of Black Hole Accretion and its Use as a Black Hole-Mass Estimator
• Effect of a dark matter halo on the determination of black hole masses
• Depleted Galaxy Cores and Dynamical Black Hole Masses
• Molecular gas in the centre of nearby galaxies from VLT/SINFONI integral field spectroscopy - I. Morphology and mass inventory
• On the hunt for ultramassive black holes in brightest cluster galaxies
• A Stellar Dynamical Mass Measurement of the Black Hole in NGC 3998 from Keck Adaptive Optics Observations
• The Black Hole in the Compact, High-dispersion Galaxy NGC 1271
• The Inner Kiloparsec of Mrk 273 with Keck Adaptive Optics
• Prospects for measuring supermassive black hole masses with future extremely large telescopes
• The most massive black holes on the Fundamental Plane of Black Hole Accretion
• Mass of the Southern Black Hole in NGC 6240 from Laser Guide Star Adaptive Optics
• The MASSIVE Survey -- XV. A Stellar Dynamical Mass Measurement of the Supermassive Black Hole in Massive Elliptical Galaxy NGC 1453
• Calibrating stellar velocity dispersions based on spatially-resolved h-band spectra for improving the m-sigma relation
• The Effect of Spatial Gradients in Stellar Mass-to-Light Ratio on Black Hole Mass Measurements
• An ALMA Gas-dynamical Mass Measurement of the Supermassive Black Hole in the Local Compact Galaxy UGC 2698
• The supermassive black hole and double nucleus of the core elliptical NGC5419
• Black Hole - Bulge Relationship of Post-Starburst Quasars at z \sim 0.3
• Red Runaways: Hypervelocity Stars, Hills Ejecta and Other Outliers in the F-M Star Regime
• NGC 307 and the Effects of Dark-Matter Haloes on Measuring Supermassive Black Holes in Disc Galaxies
• Medium Resolution Near-Infrared Spectra of the Host Galaxies of Nearby Quasars
• Cosmic quenching and scaling laws for the evolution of supermassive black holes and host galaxies