A giant radio halo in the low luminosity X-ray cluster Abell 523

被引:33
|
作者
Giovannini, G. [1 ,2 ]
Feretti, L. [2 ]
Girardi, M. [3 ]
Govoni, F. [4 ]
Murgia, M. [4 ]
Vacca, V. [4 ,5 ]
Bagchi, J. [6 ]
机构
[1] Dipartimento Astron, I-40127 Bologna, Italy
[2] Ist Radioastron INAF, I-40129 Bologna, Italy
[3] Dipartimento Fis, Sez Astron, I-34143 Trieste, Italy
[4] Osservatorio Astron Cagliari INAF, I-09012 Capoterra, Ca, Italy
[5] Univ Cagliari, Dipartimento Fis, I-09042 Monserrato, CA, Italy
[6] IUCAA, Pune 411007, Maharashtra, India
来源
ASTRONOMY & ASTROPHYSICS | 2011年 / 530卷
基金
美国国家科学基金会;
关键词
galaxies: clusters: general; galaxies: clusters: individual: Abell 523; large-scale structure of the Universe; GALAXY CLUSTERS; EMISSION; CATALOG; SAMPLE; SHOCK;
D O I
10.1051/0004-6361/201116930
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Context. Radio halos are extended and diffuse non-thermal radio sources present at the cluster center, not obviously associated with any individual galaxy. A strong correlation has been found between the cluster X-ray luminosity and the halo radio power. Aims. We observe and analyze the diffuse radio emission present in the complex merging structure Abell 523, classified as a low luminosity X-ray cluster, to discuss its properties in the context of the halo total radio power versus X-ray luminosity correlation. Methods. We reduced VLA archive observations at 1.4 GHz to derive a deep radio image of the diffuse emission, and compared radio, optical, and X-ray data. Results. Low-resolution VLA images detect a giant radio halo associated with a complex merging region. The properties of this new halo agree with those of radio halos in general discussed in the literature, but its radio power is about a factor of ten higher than expected on the basis of the cluster X-ray luminosity. Conclusions. Our study of this giant radio source demonstrates that radio halos can also be present in clusters with a low X-ray luminosity. Only a few similar cases have so far been found. This result suggests that this source represents a new class of objects, that cannot be explained by classical radio halo models. We suggest that the particle reacceleration related to merging processes is very efficient and/or the X-ray luminosity is not a good indicator of the past merging activity of a cluster.
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页数:4
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