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Session 111 - Massive Black Holes and Dynamics of Galaxy Cores.
Oral session, Thursday, January 16
We parametrize HST surface-brightness profiles of 61 elliptical galaxies
and bulges by break radii r_b and break brightnesses I_b.
Luminous galaxies (M_V<-20.5)
have cuspy cores with steep outer power-law profiles that
break at r=r_b to shallow inner profiles I\propto r^-\gamma,
Break radii for these objects are approximately
proportional to effective radius and luminosity.
Cores follow a fundamental plane that parallels the global fundamental plane.
Faint galaxies (M_V>-22.0) show steep, largely
featureless power-law profiles that lack cores.
The centers of power-law
galaxies are up to 1000 times denser in mass than the
cores of large galaxies at 10 pc. At intermediate
magnitudes (-22.0 Program
listing for Thursday
Program listing for Thursday