AN ULTRA-STEEP-SPECTRUM RADIO RELIC IN THE GALAXY CLUSTER A2443

被引：27
|
作者：
Cohen, A. S. [1 ,2 ]
Clarke, T. E. [1 ]
机构：
[1] USN, Res Lab, Washington, DC 20375 USA
[2] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA
来源：
ASTRONOMICAL JOURNAL | 2011年 / 141卷 / 05期
关键词：
galaxies: clusters: general; galaxies: clusters: individual (A2443); SKY SURVEY; ABELL CLUSTERS; EMISSION; COMPILATION; SAMPLE;
D O I：
10.1088/0004-6256/141/5/149
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present newly discovered radio emission in the galaxy cluster A2443 which (1) is diffuse, (2) has an extremely steep spectrum, (3) is offset from the cluster center, (4) is of irregular morphology, and (5) is not clearly associated with any of the galaxies within the cluster. The most likely explanation is that this emission is a cluster radio relic associated with a cluster merger. We present deep observations of A2443 at multiple low frequencies (1425, 325, and 74 MHz) which help characterize the spectrum and morphology of this relic. Based on the curved spectral shape of the relic emission and the presence of small-scale structure, we suggest that this new source is likely a member of the radio phoenix class of radio relics.
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页数：6
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