Volume 369, Number 2, April II 2001
|Page(s)||441 - 449|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 April 2001|
A comparison of radio and X-ray morphologies of four clusters of galaxies containing radio halos
Istituto di Radioastronomia del CNR, Via P. Gobetti 101, 40129 Bologna, Italy
2 Dipartimento di Astronomia, Univ. di Bologna, via Ranzani 1, 40127 Bologna, Italy
3 Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str.1, 85740 Garching, Germany
4 Dipartimento di Fisica, Univ. di Bologna, via Berti-Pichat 6/2, 40127 Bologna, Italy
Corresponding author: F. Govoni, email@example.com
Accepted: 12 January 2001
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 radio 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 surface brightness in two 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.
Key words: radiation mechanism: non-thermal / radio continuum: general / galaxies: clusters: general / galaxies: intergalactic medium / magnetic fields
© ESO, 2001
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