ar X iv : a st ro - p h / 98 10 06 9 v 1 5 O ct 1 99 8 The Mass and Extent of the Galactic Halo

ar X iv : a st ro - p h / 06 10 24 6 v 1 9 O ct 2 00 6 Special Features of Galactic Dynamics

ar X iv : a st ro - p h / 98 10 37 1 v 1 2 2 O ct 1 99 8 ELLIPTICAL GALAXY DYNAMICS

ar X iv : a st ro - p h / 01 06 39 2 v 2 1 9 Ju l 2 00 1 White Dwarfs : Contributors and Tracers of the Galactic Dark – Matter Halo

We examine the claim by Oppenheimer et al. (2001) that the local halo density of white dwarfs is an order of magnitude higher than previously thought. As it stands, the observational data support the presence of a kinematically distinct population of halo white dwarfs at the >99% confidence level. A maximum-likelihood analysis gives a radial velocity dispersion a of σ h U =150 +80 −40 km s −1 a...

ar X iv : a st ro - p h / 98 06 05 4 v 1 3 J un 1 99 8 2 . 5 – 11 . 6 μ spectrophotometry and imaging of the CfA sample

We present low resolution spectrophotometric and imaging ISO observations of a sample of 54 AGN's over the 2.5–11 µ range. The observations generally support unification schemes and set new constraints on models of the molecular torus.

ar X iv : a st ro - p h / 98 10 37 9 v 1 2 3 O ct 1 99 8 Supermassive Black Holes Then and Now ∗

Recent surveys suggest that most or all normal galaxies host a massive black hole with 1/100 to 1/1000 of the visible mass of the spheroid of the galaxy. Various lines of argument suggest that these galaxies have merged at least once in our past lightcone, and that the black holes have also merged. This leads to a merger rate of massive black holes of about 1/yrs.