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    Dynamical Measurements Of Black Hole Masses In Four Brightest Cluster Galaxies At 100 Mpc

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    2012_09_dynamicalmeasurements.pdf (1.630Mb)
    Date
    2012-09
    Author
    McConnell, Nicholas J.
    Ma, Chung-Pei
    Murphy, Jeremy D.
    Gebhardt, Karl
    Lauer, Tod R.
    Graham, James R.
    Wright, Shelley A.
    Richstone, Douglas O.
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    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-circle, of 2.1(-1.6)(+1.6) x 10(10) M-circle dot for NGC 4889, 9.7(-2.5)(+3.0) x 10(9) M-circle dot for NGC 3842, and 1.3(-0.4)(+0.5) x 10(9) M-circle dot for NGC 7768, with errors representing 68% confidence limits. For NGC 2832, we report an upper limit of M-circle < 9.0 x 10(9) M-circle dot. Our models of each galaxy include a dark matter halo, and we have tested the dependence of M-circle 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-circle to the predicted black hole masses from various fits to the relations between M-circle and stellar velocity dispersion (sigma), luminosity (L), or stellar mass (M-star). 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.
    Department
    Astronomy
    Subject
    galaxies: elliptical and lenticular, cd
    galaxies: kinematics and
    dynamics
    galaxies: nuclei
    hubble-space-telescope
    dark-matter halo
    sight velocity distributions
    massive elliptic galaxies
    adaptive optics system
    fundamental plane
    galactic nuclei
    multiobject spectrograph
    stellar populations
    3-integral models
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/35073
    Citation
    McConnell, Nicholas J., Chung-Pei Ma, Jeremy D. Murphy, Karl Gebhardt, Tod R. Lauer, James R. Graham, Shelley A. Wright, and Douglas O. Richstone. "Dynamical measurements of black hole masses in four brightest cluster galaxies at 100 Mpc." The Astrophysical Journal, Vol. 756, No. 2 (Sep., 2012): 179.
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