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Date and Time of the Query: 2018-12-11 T09:53:51 PST
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For refcode 1991A&A...252..528G:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1991A&A...252..528G The Coma cluster radio source 1253+275, revisited G. Giovannini, L.Feretti, and C. Stanghellini Istituto di Radioastronomia del CNR, Via Irnerio 46,1-40126 Bologna, Italy Dipartimento di Astronomia, Universita degli Studi, via Zamboni 33,1-40100 Bologna, Italy Received March 11, accepted July 25,1991 Abstract. Multifrequency observations obtained with the WSRT and the VLA are presented for the extended radio source 1253 + 275, located at the Coma cluster periphery. This source is of astrophysical interest for its large extent (30' X 10') and the lack of an obvious optical identification. With the present high resolution data, we exclude the existence of a discrete compact radio source which could feed the extended radio emission. The structure of 1253 + 275 is diffuse with a central ridge, a bridge of radio emission connecting the NAT Coma cluster radio galaxy NGC 4789 and a SW leading edge. From the distribution of the spectral index and the physical properties of 1253 + 275, we suggest a connection of this puzzling source with the large scale radio emission present in the Coma cluster: the central halo source Coma C and the diffuse emission found between Coma C and 1253 + 275 itself. In this case the diffuse radio emission permeating the Coma cluster would have a linear size of more than 2 Mpc, in the direction of the Coma-A 1367 supercluster. Alternatively we cannot exclude the possibility suggested in previous works, that 1253 + 275 could be the relic radio emission of the Coma cluster galaxy IC 3900. Key words: clusters: of galaxies - A 1656 - Coma - halo sources - relic radio galaxies
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