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Redshifts and Velocity Dispersions of Galaxy Clusters in the Horologium-Reticulum Supercluster

Citation

Fleenor, MC and Rose, JA and Christiansen, WA and Johnston-Hollitt, M and Hunstead, RW and Drinkwater, MJ and Saunders, W, Redshifts and Velocity Dispersions of Galaxy Clusters in the Horologium-Reticulum Supercluster, The Astronomical Journal, 131, (3) pp. 1280-1287. ISSN 0004-6256 (2006) [Refereed Article]

DOI: doi:10.1086/500197

Abstract

We present 118 new optical redshifts for galaxies in 12 clusters in the Horologium-Reticulum supercluster (HRS) of galaxies. For 76 galaxies, the data were obtained with the Dual Beam Spectrograph on the 2.3 m telescope of the Australian National University at Siding Spring Observatory. After combining 42 previously unpublished redshifts with our new sample, we determine mean redshifts and velocity dispersions for 13 clusters in which previous observational data were sparse. In 6 of the 13 clusters, the newly determined mean redshifts differ by more than 750 km s -1 from the published values. In three clusters, A3047, A3109, and A3120, the redshift data indicate the presence of multiple components along the line of sight. The new cluster redshifts, when combined with other reliable mean redshifts for clusters in the HRS, are found to be distinctly bimodal. Furthermore, the two redshift components are consistent with the bimodal redshift distribution found for the intercluster galaxies in the HRS by Fleenor and coworkers. © 2006. The American Astronomical Society. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Johnston-Hollitt, M (Dr Melanie Johnston-Hollitt)
ID Code:39298
Year Published:2006
Web of Science® Times Cited:11
Deposited By:Physics
Deposited On:2006-08-01
Last Modified:2007-05-17
Downloads:0

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