Ray P. Norris
Articles written in Journal of Astrophysics and Astronomy
Volume 32 Issue 4 December 2011 pp 585-588
ATLAS, and Wide-Angle Tail Galaxies in ATLAS
Minnie Y. Mao Rob Sharp D. J. Saikia Ray P. Norris Melanie Johnston-Hollitt Enno Middelberg Jim E. J. Lovell
Using the Australia Telescope Compact Array (ATCA), ATLAS (Australia Telescope Large Area Survey) is imaging two fields totalling 7 square degrees down to 10 𝜇Jy beam-1 at 1.4 GHz. We have found 6 wide-angle tail galaxies (WATs), 4 of which have sufficient data to identify associated galaxy overdensities. The largest WAT, at a red-shift of 0.22, appears to be associated with an overdensity of galaxies that is spread over an unusually large extent of 12Mpc, with a velocity range of 4500 km s-1. Here we present the WATs in ATLAS and discuss the implications of these observations for future large-scale radio surveys such as ASKAP-EMU.
Volume 32 Issue 4 December 2011 pp 599-607
Evolutionary Map of the Universe: Tracing Clusters to High Red-shift
The Australian SKA Pathfinder (ASKAP) is a new radio-telescope being built in Western Australia. One of the key surveys for which it is being built is EMU (Evolutionary Map of the Universe), which will make a deep (∼ 10 𝜇Jy/bm rms) radio continuum survey covering the entire sky as far North as +30°. EMU may be compared to the NRAO VLA Sky Survey (NVSS), except that it will have about 45 times the sensitivity, and five times the resolution. EMU will also have much better sensitivity to diffuse emission than previous large surveys, and is expected to produce a large catalogue of relics, tailed galaxies, and halos, and will increase the number of known clusters by a significant factor. Here we describe the EMU project and its impact on the astrophysics of clusters.
Volume 44, 2023
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