Ultraluminous X-ray sources (ULXs) are accreting black holes that may contain the missing
population of intermediate mass black holes or reflect super-Eddington accretion physics …

The mathematical simplicity of black holes, combined with their links to some of the most
energetic events in the universe, means that black holes are key objects for fundamental …

Following our study on the incidence, morphology and kinematics of the ionized gas in early-
type galaxies, we now address the question of what is powering the observed nebular …

Today's sensitive X-ray observations allow the study of populations of X-ray binaries in
galaxies as distant as 20–30 Mpc. Photometric diagrams and luminosity functions applied to …

One hundred fifty-four discrete non-nuclear ultraluminous X-ray (ULX) sources, with
spectroscopically determined intrinsic X-ray luminosities greater than 10 39 ergs s-1, are …

We have selected a sample of 30 normal (non-cD) early-type galaxies, for all of which
optical spectroscopy is available and which have been observed with Chandra to a depth …

We present a Chandra study of mass profiles in seven elliptical galaxies, of which three
have galaxy-scale and four have group-scale halos, demarcated at 10 13 M☉. These …

Hot gaseous halos are predicted around all large galaxies and are critically important for our
understanding of galaxy formation, but they have never been detected at distances beyond …

We have derived bias-corrected X-ray luminosity functions (XLFs) of sources detected in a
uniformly selected sample of 14 E and S0 galaxies observed with Chandra ACIS-S3. The …

We place general constraints on the luminosity and mass of hot X-ray-emitting gas residing
in extended" hot halos" around nearby massive galaxies. We examine stacked images of …