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XMM Observations of an IXO in NGC 2276
David S. Davis, Richard F. Mushotzky
We present the results from a ~53 ksec XMM observation of NGC 2276. This galaxy has an unusual optical morphology with the disk of this spiral appearing to be truncated along the w…
Probable intermediate mass black holes in NGC4559: XMM-Newton spectral and timing constraints
Mark Cropper, Roberto Soria, Richard F. Mushotzky +3
We have examined X-ray and optical observations of two ultra-luminous X-ray sources, X7 and X10 in NGC4559, using XMM-Newton, Chandra and HST. The UV/X-ray luminosity of X7 exceeds…
The Changing AGN Population
A. T. Steffen, A. J. Barger, L. L. Cowie +2
We investigate how the fraction of broad-line sources in the AGN population changes with X-ray luminosity and redshift. We first construct the rest-frame hard-energy (2-8 keV) X-ra…
Chandra Observations of Point Sources in Abell 2255
D. S. Davis, N. A. Miller, R. F. Mushotzky
In our search for ``hidden'' AGN we present results from a Chandra observation of the nearby cluster Abell 2255. Eight cluster galaxies are associated with point-like X-ray emissio…
Discovery of X-ray QPOs from an Ultra-luminous X-ray Source in M82: Evidence Against Beaming
Tod E. Strohmayer, Richard F. Mushotzky
We report the discovery with the EPIC CCD cameras onboard XMM-Newton of a 54 mHz quasiperiodic oscillation (QPO) in the > 2 keV X-ray flux from an ultraluminous X-ray source (ULX)…
Groups and the Entropy Floor- XMM-Newton Observations of Two Groups
R. Mushotzky, E. Figueroa-Feliciano, M. Loewenstein +1
Using XMM-Newton spatially resolved X-ray imaging spectroscopy we obtain the temperature, density, entropy, gas mass, and total mass profiles for two groups of galaxies out to ~0.3…