Publications (10)
A Survey for Supernovae in Massive High-Redshift Clusters
Keren Sharon, A. Gal-Yam, D. Maoz +12
We describe our ongoing program designed to measure the SN-Ia rate in a sample of massive z=0.5-0.9 galaxy clusters. The SN-Ia rate is a poorly known observable, especially at high…
Thomson Thick X-ray Absorption in a Broad Absorption Line Quasar PG0946+301
S. Mathur, P. J. Green, N. Arav +14
We present a deep ASCA observation of a Broad Absorption Line Quasar (BALQSO) PG0946+301. The source was clearly detected in one of the gas imaging spectrometers, but not in any ot…
X-ray thermal coronae of galaxies in hot clusters -- ubiquity of embedded mini cooling cores
M. Sun, C. Jones, W. Forman +3
We present a systematic investigation of X-ray thermal coronae in 157 early-type galaxies and 22 late-type galaxies from a survey of 25 hot (kT>3 keV), nearby (z<0.05) clusters, ba…
Deep and narrow CO absorption revealing molecular clouds in the Hydra-A brightest cluster galaxy
Tom Rose, A. C. Edge, F. Combes +20
Active galactic nuclei play a crucial role in the accretion and ejection of gas in galaxies. Although their outflows are well studied, finding direct evidence of accretion has prov…
A 70 kpc X-ray tail in the cluster A3627
M. Sun, C. Jones, W. Forman +3
We present the discovery of a 70 kpc X-ray tail behind the small late-type galaxy ESO137-001 in the nearby, hot (T=6.5 keV) merging cluster A3627, from both Chandra and XMM observa…
Hundred Thousand Degree Gas in the Virgo Cluster of Galaxies
W. B. Sparks, J. E. Pringle, R. F. Carswell +6
The physical relationship between low-excitation gas filaments at ~10^4 K, seen in optical line emission, and diffuse X-ray emitting coronal gas at ~10^7 K in the centers of many g…
Galaxy Cluster Astrophysics and Cosmology: Questions and Opportunities for the Coming Decade
S. T. Myers, C. Pfrommer, J. Aguirre +21
We are learning much about how structure forms, in particular how clusters as nodes in the cosmic web evolve and accrete matter, and about the physical processes within these objec…
Discovery of Ghost Cavities in Abell 2597's X-ray Atmosphere
B. R. McNamara, M. W. Wise, P. E. J. Nulsen +10
A Chandra image of the central 100 kpc of the Abell 2597 cluster of galaxies shows bright, irregular, X-ray emission within the central dominant cluster galaxy (CDG), and two low s…
An X-ray Galaxy Cluster Survey for Investigations of Dark Energy
Z. Haiman, S. Allen, N. Bahcall +34
The amount and nature of dark energy (DE) can be tightly constrained by measuring the spatial correlation features and evolution of a sample of ~ 100,000 galaxy clusters over the r…
Discovery of CIV Emission Filaments in M87
W. B. Sparks, J. E. Pringle, M. Donahue +4
Gas at intermediate temperature between the hot X-ray emitting coronal gas in galaxies at the centers of galaxy clusters, and the much cooler optical line emitting filaments, yield…