Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-04-30
Astronomy and Astrophysics
Astrophysics
10 pages, 10 figures, 2 tables. MN latex, MNRAS in press
Scientific paper
10.1046/j.1365-8711.1998.01726.x
In this paper we present a detailed study of the radio galaxy J1324-3138, located at a projected distance of 2 arcmin from the centre of the Abell cluster of galaxies A3556, belonging to the core of the Shapley Concentration, at an average redshift z=0.05. We have observed J1324-3138 over a wide range of frequencies: at 327 MHz (VLA), at 843 MHz (MOST), and at 1376 MHz, 2382 MHz, 4790 MHz and 8640 MHz (ATCA). Our analysis suggests that J1324-3138 is a remnant of a tailed radio galaxy, in which the nuclear engine has switched off and the radio source is now at a late stage of its evolution, confined by the intracluster gas. The radio galaxy is not in pressure equilibrium with the external medium, as it is often found for extended radio sources in clusters of galaxies. We favour the hypothesis that the lack of observed polarised radio emission in the source is due to Faraday rotation by a foreground screen, i.e. the source is seen through a dense cluster gas, characterised by a random magnetic field. An implication of the head-tail nature of the source is that J1324-3138 is moving away from the core of A3556 and that possibly a major merging event between the core of A3556 and the subgroup hosting J1324-3138 has already taken place.
Bardelli Sandro
Hunstead Richard W.
Morganti Rafaella
Venturi Tiziana
No associations
LandOfFree
Radio Properties of the Shapley Concentration. II. J1324-3138: a remnant of a radio galaxy in the Abell cluster A3556? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Radio Properties of the Shapley Concentration. II. J1324-3138: a remnant of a radio galaxy in the Abell cluster A3556?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio Properties of the Shapley Concentration. II. J1324-3138: a remnant of a radio galaxy in the Abell cluster A3556? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-5820