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Astron. Astrophys. 344, 472-482 (1999)


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The radio galaxies and the magnetic field in Abell 119

L. Feretti 1, D. Dallacasa 1, F. Govoni 2, G. Giovannini 1,3, G.B. Taylor 4 and U. Klein 5

1 Istituto di Radioastronomia del CNR, Via P. Gobetti 101, I-40129 Bologna, Italy
2 Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
3 Dipartimento di Fisica, Universitá di Bologna, I-40100 Bologna, Italy
4 National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801 0387, USA
5 Radioastronomisches Institut der Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany

Received 16 September 1998 / Accepted 8 January 1999

Abstract

We present new, multiwavelength Very Large Array observations of the 3 radio galaxies in the cluster Abell 119: 0053-015, 0053-016 and 3C 29. The first two radio galaxies, which lie close to the cluster center, show a narrow-angle-tailed structure, with many twists in the tails. The third radio source is located at the cluster periphery, and shows an undistorted FR I morphology. All three radio sources are strongly polarized at the highest frequencies, and all three show both more depolarization and higher Faraday Rotation Measures with increasing proximity to the cluster center. We interpret this polarization behaviour as induced by the magneto-ionized intracluster medium, whose magnetic field is estimated to be in the range 5-10 µG.

Key words: galaxies: clusters: individual: A 119 – radio continuum: galaxies – magnetic fields – galaxies: intergalactic medium

Send offprint requests to: lferetti@ira.bo.cnr.it

© European Southern Observatory (ESO) 1999

Online publication: March 18, 1999

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