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Wide-angle tail galaxies in ATLAS


Mao, MY and Sharp, R and Saikia, DJ and Norris, RP and Johnston-Hollitt, M and Middelberg, E and Lovell, JEJ, Wide-angle tail galaxies in ATLAS, Monthly Notices of the Royal Astronomical Society, 406, (4) pp. 2578-2590. ISSN 0035-8711 (2010) [Refereed Article]

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DOI: doi:10.1111/j.1365-2966.2010.16853.x


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. TheseWATs are in the redshift range of 0.1469−0.3762, and we find evidence of galaxy overdensities in the vicinity of four of theWATs 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.

Item Details

Item Type:Refereed Article
Keywords:galaxies: active – galaxies: clusters: general – galaxies: distances and redshifts –
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Mao, MY (Miss Minnie Mao)
UTAS Author:Lovell, JEJ (Dr Jim Lovell)
ID Code:65934
Year Published:2010
Web of Science® Times Cited:25
Deposited By:Physics
Deposited On:2010-12-10
Last Modified:2011-03-24

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