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X-Ray Spectral Properties of Low-Mass X-Ray Binaries in Nearby Galaxies
We have investigated the X-ray spectral properties of a collection of low-mass X-ray binaries (LMXBs) within a sample of 15 nearby early-type galaxies using proprietary and archival data from theExpand
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The Structure of the Milky Way's Hot Gas Halo
The Milky Way's million degree gaseous halo contains a considerable amount of mass that, depending on its structural properties, can be a significant mass component. In order to analyze the structureExpand
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Do Hot Halos Around Galaxies Contain the Missing Baryons
Galaxies are missing most of their baryons, and many models predict these baryons lie in a hot halo around galaxies. We establish observationally motivated constraints on the mass and radii of theseExpand
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The Hot and Energetic Universe: A White Paper presenting the science theme motivating the Athena+ mission
This White Paper, submitted to the recent ESA call for science themes to define its future large missions, advocates the need for a transformational leap in our understanding of two key questions inExpand
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The Search for the Missing Baryons at Low Redshift
At low redshift, only about one-tenth of the known baryons lie in galaxies or the hot gas seen in galaxy clusters and groups. Models posit that these “missing baryons” are in gaseous form inExpand
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Creation of cosmic structure in the complex galaxy cluster merger Abell 2744
We present a detailed strong lensing, weak lensing and X-ray analysis of Abell 2744 (z = 0:308), one of the most actively merging galaxy clusters known. It appears to have unleashed ‘dark’, ‘ghost’,Expand
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Puzzling accretion onto a black hole in the ultraluminous X-ray source M 101 ULX-1
There are two proposed explanations for ultraluminous X-ray sources (ULXs) with luminosities in excess of 1039 erg s−1. They could be intermediate-mass black holes (more than 100–1,000 solar masses,Expand
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CHANDRA X-RAY OBSERVATIONS OF THE X-RAY FAINT ELLIPTICAL GALAXY NGC 4697
A Chandra ACIS S3 observation of the X-ray faint elliptical galaxy NGC 4697 resolves much of the X-ray emission (61% of the counts from within one effective radius) into 90 point sources, of whichExpand
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On the Baryon Fractions in Clusters and Groups of Galaxies
We present the baryon fractions of 2MASS groups and clusters as a function of cluster richness using total and gas masses measured from stacked ROSAT X-ray data and stellar masses estimated from theExpand
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Hot plasma and black hole binaries in starburst galaxy M82.
High-resolution x-ray observations of the prototype starburst galaxy Messier 82 (M82) obtained with the advanced CCD (charge-coupled device) imaging spectrometer on board the Chandra X-rayExpand
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