Journal Article

Wide-angle tail galaxies in ATLAS

Minnie Y. Mao, Rob Sharp, D. J. Saikia, Ray P. Norris, Melanie Johnston-Hollitt, Enno Middelberg and Jim E. J. Lovell

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 406, issue 4, pages 2578-2590
Published in print August 2010 | ISSN: 0035-8711
Published online August 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16853.x
Wide-angle tail galaxies in ATLAS

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We present radio images of a sample of six wide-angle tail (WAT) radio sources, identified in the Australia Telescope Large Area Survey 1.4-GHz radio survey, and new spectroscopic redshifts for four of these sources. These WATs are in the redshift range of 0.1469−0.3762, and we find evidence of galaxy overdensities in the vicinity of four of the WATs from either spectroscopic or photometric redshifts. We also present follow-up spectroscopic observations of the area surrounding the largest WAT, S1189, which is at a redshift of ∼0.22. The spectroscopic observations, taken using the AAOmega spectrograph on the Anglo-Australian Telescope, show an overdensity of galaxies at this redshift. The galaxies are spread over an unusually large area of ∼12 Mpc with a velocity spread of ∼4500 km s−1. This large-scale structure includes a highly asymmetric Fanaroff–Riley type I radio galaxy and also appears to host a radio relic. It may represent an unrelaxed system with different sub-structures interacting or merging with one another. We discuss the implications of these observations for future large-scale radio surveys.

Keywords: galaxies: active; galaxies: clusters: general; galaxies: distances and redshifts; galaxies: general; radio continuum: galaxies

Journal Article.  6762 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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