NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-25 T16:07:41 PDT
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For refcode 2011A&A...535A..82V:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2011A&A...535A..82V Discovery of diffuse radio emission in the galaxy cluster A1689 Vacca, V.; Govoni, F.; Murgia, M.; Giovannini, G.; Feretti, L.; Tugnoli, M.; Verheijen, M. A.; Taylor, G. B. Abstract. Aims: The aim of this work is to investigate the possible presence of extended diffuse synchrotron radio emission associated with the intracluster medium of the complex galaxy cluster A1689. Methods: The radio continuum emission of A1689 has been investigated by analyzing archival observations at 1.2 and 1.4 GHz obtained with the Very Large Array in different configurations. Results: We report the detection of an extended, diffuse, low-surface brightness radio emission located in the central region of A1689. The surface brightness profile of the diffuse emission at 1.2 GHz indicates a central radio brightness of ~= 1.7 {mu}Jy/arcsec^2^ and the 3{sigma} radio isophothes reveal the largest linear size to be 730 kpc. Given its central location, the low-level surface brightness, and the comparatively large extension, we classify the diffuse cluster-wide emission in A1689 as a small radio halo. Key words: galaxies: clusters: general, galaxies: clusters: individual: A1689, magnetic fields, large-scale structure of Universe
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