7 papers
Optical studies of ultra-luminous X-ray sources in nearby galaxies
Ji-Feng Liu, Joel N. Bregman, Patrick Seitzer +1
Optical studies of ultra-luminous X-ray sources is an essential step in understanding the nature of these enigmatic sources, and in this paper we report our studies of five ULXs in…
High-Velocity Clouds in M 83 and M 51
Eric D. Miller, Joel N. Bregman
Various scenarios have been proposed to explain the origin of the Galactic high-velocity clouds, predicting different distances and implying widely varying properties for the Galax…
Hot Baryons in Supercluster Filaments
Eric D. Miller, Renato A. Dupke, Joel N. Bregman
Most of the baryons in the local universe are ``missing'' in that they are not in galaxies or in the previously detected gaseous phases. These missing baryons are predicted to be i…
Detection of Intracluster Gas Bulk Velocities in the Perseus and Centaurus Clusters
Renato A. Dupke, Joel N. Bregman
We report the results of spatially resolved X-ray spectroscopy of 8 different ASCA pointings distributed symmetrically around the center of the Perseus cluster. The outer region of…
Constraints on Cool Gas in Rich Clusters of Galaxies
Eric D. Miller, Joel N. Bregman, Patricia M. Knezek
Cool gas should be present in galaxy clusters due to stripping of galactic gas, infall onto the cluster, and from cooling flows. We searched for this gas through resonance absorpti…
Far Infrared Emission from Galaxy Clusters and Early-Type Galaxies
Joel N. Bregman, Caroline V. Cox
Infrared emission has been detected from normal elliptical galaxies and from clusters of galaxies at 60um and 100um with the IRAS satellite. In both cases, the emission has the cha…