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Color Bimodality in M87 Globular Clusters
Christopher Z. Waters, Stephen E. Zepf, Tod R. Lauer +1
We present an analysis of a 50 orbit HST ACS observation of the M87 globular cluster system. We use the extraordinary depth of this dataset to test whether the colors and magnitude…
A Stellar Dynamical Measurement of the Black Hole Mass in the Maser Galaxy NGC 4258
Christos Siopis, Karl Gebhardt, Tod R. Lauer +13
We determine the mass of the black hole at the center of the spiral galaxy NGC 4258 by constructing axisymmetric dynamical models of the galaxy. These models are constrained by hig…
Dissipation and Extra Light in Galactic Nuclei: III. 'Core' Ellipticals and 'Missing' Light
Philip F. Hopkins, Tod R. Lauer, Thomas J. Cox +2
We investigate how 'extra' central light in the surface brightness profiles of cusp ellipticals relates to the profiles of ellipticals with cores. Cusp elliptical envelopes are for…
Dissipation and Extra Light in Galactic Nuclei: II. 'Cusp' Ellipticals
Philip F. Hopkins, Thomas J. Cox, Suvendra N. Dutta +3
We study the origin and properties of 'extra' or 'excess' central light in the surface brightness profiles of cusp or power-law ellipticals. Dissipational mergers give rise to two-…
The Black Hole Mass and Extreme Orbital Structure in NGC1399
Karl Gebhardt, Tod R. Lauer, Jason Pinkney +12
The largest galaxies, and in particular central galaxies in clusters, offer unique insight into understanding the mechanism for the growth of nuclear black holes. We present Hubble…
Selection Bias in Observing the Cosmological Evolution of the Mbh-sigma and Mbh-L Relationships
Tod R. Lauer, Scott Tremaine, Douglas Richstone +1
Programs to observe evolution in the Mbh-sigma or Mbh-L relations typically compare black-hole masses, Mbh, in high-redshift galaxies selected by nuclear activity to Mbh in local g…