EDP Sciences
Free access
Volume 444, Number 1, December II 2005
Page(s) 157 - 164
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20052808

A&A 444, 157-164 (2005)
DOI: 10.1051/0004-6361:20052808

Diffuse radio emission in a REFLEX cluster

L. Feretti1, P. Schuecker2, H. Böhringer2, F. Govoni1, 3 and G. Giovannini1, 3

1  Istituto di Radioastronomia - INAF, via Gobetti 101, 40129 Bologna, Italy
    e-mail: lferetti@ira.inaf.it
2  Max Planck Institut für Extraterrestrische Physik, PO Box 1312, 85741 Garching, FRG
3  Dipartimento di Astronomia, Univ. Bologna, Via Ranzani 1, 40127 Bologna, Italy

(Received 3 February 2005 / Accepted 16 July 2005 )

Deep Very Large Array radio observations are presented for the REFLEX clusters $RXC\,J0437.1{+}0043$ and $RXC\,J1314.4{-}2515$. They are at similar distances and show similar X-ray luminosity, but they are quite different in X-ray structure. Indeed $RXC\,J0437.1{+}0043$ is regular and relaxed, whereas $RXC\,J1314.4{-}2515$ is characterized by substructure and possible merging processes. The radio images reveal the lack of diffuse emission in $RXC\,J0437.1{+}0043$ and the presence of a complex diffuse structure in $RXC\,J1314.4{-}2515$. The diffuse source in the latter cluster consists of a central radio halo which extends to the West toward the cluster periphery and bends to the North to form a possible relic. Another extended source is detected in the eastern cluster peripheral region. Although there could be plausible optical identifications for this source, it might also be a relic candidate owing to its very steep spectrum. The present results confirm the tight link between diffuse cluster radio sources and cluster merger processes.

Key words: galaxies: clusters: general -- galaxies: intergalactic medium -- radio continuum: general -- X-rays: general

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© ESO 2005