AAS 197, January 2001
Session 106. Galaxy Clusters and Large-Scale Structure I
Display, Thursday, January 11, 2001, 9:30-4:00pm, Exhibit Hall

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[106.09] Low Frequency Radio Observations of the Galaxy Clusters Abell 2256 and Abell 754.

A. S. Cohen (Naval Research Lab), T. E. Clarke (NRAO), N. Kassim (Naval Research Lab), T. A. En{ß}lin (Max Planck Institute for Radioastronomy), D. Neumann (CEA/Saclay, SAp, France)

We present 330 MHz and 74 MHz VLA observations of A2256 and A754. Extended cluster emission, consistent with the presence of both radio relics and a radio halo, is detected in A2256 at both 330 MHz and 74 MHz. For many years there has been uncertainty about the existence of a radio halo in A754. At 330 MHz, we detect more than 1 Jy of apparently extended emission in the central region not associated with previously known point sources. At 74 MHz we detect not only this radio halo but also additional emission in the peripheral regions of A754 which we speculate to be cluster radio relics. X-ray data show that this cluster is in the process of a major merger. The existence of radio relics would be highly relevant in light of recent evidence in favor of a merger-relic connection. Maps will be presented and the results and scientific implications discussed.

The author(s) of this abstract have provided an email address for comments about the abstract: cohen@rsd.nrl.navy.mil

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