Large-scale velocity structures in the Horologium-Reticulum supercluster

Fleenor, M. C., Rose, J. A., Christiansen, W. A., Hunstead, R. W., Johnston-Hollitt, M., Drinkwater, M. J. and Saunders, W. (2005) Large-scale velocity structures in the Horologium-Reticulum supercluster. Astronomical Journal, 130 3: 957-967. doi:10.1086/431972

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Author Fleenor, M. C.
Rose, J. A.
Christiansen, W. A.
Hunstead, R. W.
Johnston-Hollitt, M.
Drinkwater, M. J.
Saunders, W.
Title Large-scale velocity structures in the Horologium-Reticulum supercluster
Journal name Astronomical Journal   Check publisher's open access policy
ISSN 0004-6256
Publication date 2005
Sub-type Article (original research)
DOI 10.1086/431972
Open Access Status File (Publisher version)
Volume 130
Issue 3
Start page 957
End page 967
Total pages 11
Editor John S. Gallagher III
Place of publication Madison, WI, United States
Publisher Institute of Physics Publishing
Collection year 2005
Language eng
Abstract We present 547 optical redshifts obtained for galaxies in the region of the Horologium-Reticulum supercluster (HRS) using the 6 degrees field (6dF) multifiber spectrograph on the UK Schmidt Telescope at the Anglo-Australian Observatory. The HRS covers an area of more than 12 degrees x 12 degrees on the sky centered at approximately alpha = 03(h)19(m), delta = 50 degrees 02'. Our 6dF observations concentrate on the intercluster regions of the HRS, from which we describe four primary results. First, the HRS spans at least the redshift range from 17,000 to 22,500 km s(-1). Second, the overdensity of galaxies in the intercluster regions of the HRS in this redshift range is estimated to be 2.4, or delta rho/(rho) over bar similar to 1: 4. Third, we find a systematic trend of increasing redshift along a southeast-northwest spatial axis in the HRS, in that the mean redshift of HRS members increases by more than 1500 km s(-1) from southeast to northwest over a 12 degrees region. Fourth, the HRS is bimodal in redshift with a separation of similar to 2500 km s(-1) (35 Mpc) between the higher and lower redshift peaks. This fact is particularly evident if the above spatial-redshift trend is fitted and removed. In short, the HRS appears to consist of two components in redshift space, each one exhibiting a similar systematic spatial-redshift trend along a southeast-northwest axis. Lastly, we compare these results from the HRS with the Shapley supercluster and find similar properties and large-scale features.
Keyword Galaxies : Clusters : General
Large-scale Structure Of Universe
Astronomy & Astrophysics
6df Galaxy Survey
Shapley Supercluster
Redshift Survey
Rich Clusters
Void Network
Aco Clusters
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 05:48:23 EST