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XMM-Newton Observation of an X-ray Trail Between the Spiral Galaxy NGC6872 and the Central Elliptical NGC6876 in the Pavo Group
M. Machacek, P. Nulsen, L. Stirbat +2
We present XMM-Newton observations of a trail of enhanced X-rayemission extending along the 8'.7 X 4' region between the spiral NGC6872 and the dominant elliptical NGC6876 in the P…
Heating a Distant Galaxy Cluster by Giant X-ray Cavities and Large-Scale Shock Fronts
B. R. McNamara, P. E. J. Nulsen, M. W. Wise +4
We report the discovery of a pair of giant cavities, each nearly 200 kpc in diameter, embedded in the gaseous halo of the redshift z=0.216 galaxy cluster MS0735.6+7421. The cavitie…
The cluster-scale AGN outburst in Hydra A
P. E. J. Nulsen, B. R. McNamara, M. W. Wise +1
Deep Chandra observations of the Hydra A Cluster reveal a feature in the X-ray surface brightness that surrounds the 330 MHz radio lobes of the AGN at the cluster center. Surface b…
The dwarf galaxy population in Abell 2218
Michael B. Pracy, Roberto De Propris, Simon P. Driver +2
We present results from a deep photometric study of the rich galaxy cluster Abell 2218 (z=0.18) based on archival HST WFPC2 F606W images. These have been used to derive the luminos…
A Chandra X-ray Observation of Abell 1991: The Late Stages of Infall?
Mangala Sharma, B. R. McNamara, P. E. J. Nulsen +6
We present results from a 38 ks Chandra X-ray observation of the z=0.059 galaxy cluster A1991. The cluster has a bright X-ray core and a central temperature gradient that declines…
In Search of the Dark Ages -- An Experimental Challenge
J. Bland-Hawthorn, P. E. J. Nulsen
Most direct source detections beyond z~7 are likely to arise from wide-field narrowband surveys of Ly-a emission in the J band. For this to be true, the Ly-a emission must somehow…
Reflections of AGN Outbursts in the Gaseous Atmosphere of M87
W. Forman, P. Nulsen, S. Heinz +7
We combined deep Chandra, ROSAT HRI, and XMM-Newton observations of M87 to study the impact of AGN outbursts on its gaseous atmosphere. Many X-ray features appear to be a direct re…