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Date and Time of the Query: 2019-04-21 T08:42:59 PDT
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For refcode 2012ApJ...756..179M:
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Copyright by American Astronomical Society. Reproduced by permission
2012ApJ...756..179M Dynamical Measurements of Black Hole Masses in Four Brightest Cluster Galaxies at 100 Mpc McConnell, Nicholas J.; Ma, Chung-Pei; Murphy, Jeremy D.; Gebhardt, Karl; Lauer, Tod R.; Graham, James R.; Wright, Shelley A.; Richstone, Douglas O. Abstract. We present stellar kinematics and orbit superposition models for the central regions of four brightest cluster galaxies, based upon integral-field spectroscopy at Gemini, Keck, and McDonald Observatories. Our integral-field data span radii from <100 pc to tens of kiloparsecs, comparable to the effective radius of each galaxy. We report black hole masses, M_blackhole_, of 2.1^+1.6^_-1.6_ x 10^10^ M_sun_ for NGC 4889, 9.7^+3.0^_-2.5_ x 10^9^ M_sun_ for NGC 3842, and 1.3^+0.5^_-0.4_ x 10^9^ M_sun_ for NGC 7768, with errors representing 68% confidence limits. For NGC 2832, we report an upper limit of M_blackhole_ < 9.0 x 10^9^ M_sun_. Our models of each galaxy include a dark matter halo, and we have tested the dependence of M_blackhole_ on the model dark matter profile. Stellar orbits near the center of each galaxy are tangentially biased, on comparable spatial scales to the galaxies' photometric cores. We find possible photometric and kinematic evidence for an eccentric torus of stars in NGC 4889, with a radius of nearly 1 kpc. We compare our measurements of M_blackhole_ to the predicted black hole masses from various fits to the relations between M_blackhole_ and stellar velocity dispersion (sigma), luminosity (L), or stellar mass (M_sstarf_). Still, the black holes in NGC 4889 and NGC 3842 are significantly more massive than all sigma-based predictions and most L-based predictions. The black hole in NGC 7768 is consistent with a broader range of predictions. Key words: galaxies: elliptical and lenticular, cD, galaxies: kinematics and dynamics, galaxies: nuclei
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