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    Orbit-Based Dynamical Models Of The Sombrero Galaxy (NGC 4594)

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    2011_09_ngc4594.pdf (4.317Mb)
    Date
    2011-09
    Author
    Jardel, John R.
    Gebhardt, Karl
    Shen, Juntai T.
    Fisher, David B.
    Kormendy, John
    Kinzler, Jeffry
    Lauer, Tod R.
    Richstone, Douglas
    Gultekin, Kayhan
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    Abstract
    We present axisymmetric, orbit-based models to study the central black hole (BH), stellarmass-to-light ratio (M/L), and dark matter (DM) halo of NGC 4594 (M104, the Sombrero Galaxy). For stellar kinematics, we use published high-resolution kinematics of the central region taken with the Hubble Space Telescope, newly obtained Gemini long-slit spectra of the major axis, and integral field kinematics from the Spectroscopic Areal Unit for Research on Optical Nebulae instrument. At large radii, we use globular cluster kinematics to trace the mass profile and apply extra leverage to recovering the DM halo parameters. We find a BH of mass M-center dot = (6.6 +/- 0.4) x 10(8) M-circle dot and determine the stellar M/L-I = 3.4 +/- 0.05 (uncertainties are the 68% confidence band marginalized over the other parameters). Our best-fit DM halo is a cored logarithmic model with asymptotic circular speed V-c = 376 +/- 12 km s(-1) and core radius r(c) = 4.7 +/- 0.6 kpc. The fraction of dark to total mass contained within the half-light radius is 0.52. Taking the bulge and disk components into account in our calculation of sigma(e) puts NGC 4594 squarely on the M-sigma relation. We also determine that NGC 4594 lies directly on the M-L relation.
    Department
    Astronomy
    Subject
    galaxies: individual (m104, ngc 4594)
    galaxies: kinematics and
    dynamics
    galaxies: photometry
    supermassive black-holes
    dark-matter halo
    bulge mass relation
    gaussian expansion method
    globular-cluster systems
    hubble-space-telescope
    to-light ratio
    velocity dispersion
    stellar
    populations
    kinematical models
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34764
    Citation
    Jardel, John R., Karl Gebhardt, Juntai Shen, David B. Fisher, John Kormendy, Jeffry Kinzler, Tod R. Lauer, Douglas Richstone, and Kayhan G�ltekin. "Orbit-based Dynamical Models of the Sombrero Galaxy (NGC 4594)." The Astrophysical Journal, Vol. 739, No. 1 (Sep., 2011): 21.
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