A comparison of radio and X-ray morphologies of four clusters of galaxies containing radio halos

被引:177
作者
Govoni, F
Ensslin, TA
Feretti, L
Giovannini, G
机构
[1] CNR, Ist Radioastron, I-40129 Bologna, Italy
[2] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy
[3] Max Planck Inst Astrophys, D-85740 Garching, Germany
[4] Univ Bologna, Dipartmento Fis, I-40127 Bologna, Italy
关键词
radiation mechanism : non-thermal; radio continuum : general; galaxies : clusters : general; galaxies : intergalactic medium; magnetic fields;
D O I
10.1051/0004-6361:20010115
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Clusters of galaxies may contain cluster-wide, centrally located, diffuse radio sources, called halos. They have been found to show morphologies similar to those of the X-ray emission. To quantify this qualitative statement we performed a point-to-point comparison of the ratio and the X-ray emission for four clusters of galaxies containing radio halos: Coma: Abell 2255, Abell 2319, Abell 2744. Our study leads to a linear relation between the radio and the X-ray sur surface brightness in tao clusters, namely Abell 2255 and Abell 2744. In Coma and A2319 the radio and the X-ray brightnesses seem to be: related with a sub-linear power law. Implications of these findings within simple radio halo formation models are briefly discussed.
引用
收藏
页码:441 / 449
页数:9
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