Big Blackhole in Draco

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Session 32 -- Local Group Galaxies
Display presentation, Tuesday, 9:30-6:30, Heller Lounge Room

[32.04] Big Blackhole in Draco

N.V. Strobel, G. Lake (Univ. WA)

The velocity dispersion of $9 \pm 2 \, km \, s^{-1}$ for the dwarf spheroidal galaxy Draco has been used to point to a large central mass density of $0.1 - 1 M_{\sun} pc^{-3}$ and a large dark matter halo. We offer a different dark matter model. The velocity and surface brightness profile can be fitted by a massive blackhole that has grown to a mass of $1 - 2 \times 10^6 M_{\sun}$ over a period less than the relaxation time of the system. Such a large blackhole would have inflated the original velocities by a factor of three to four and created a distinctive velocity cusp in close to the center.

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