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New Structure in the Shapley Supercluster

Published online by Cambridge University Press:  05 March 2013

M. J. Drinkwater ,
D. Proust ,
Q. A. Parker ,
H. Quintana  and
E. Slezak
M. J. Drinkwater
Affiliation:
School of Physics, University of New South Wales, Sydney, NSW 2052, Australia
D. Proust
Affiliation:
DAEC, Observatoire de Meudon, 92195 Meudon Cedex, France
Q. A. Parker
Affiliation:
Anglo-Australian Observatory, Coonabarabran, NSW 2357, Australia
H. Quintana
Affiliation:
Departamento de Astronomia y Astrofisica, Pontificia Universidad Católica de Chile, Casilla 104, Santiago 22, Chile; [email protected]
E. Slezak
Affiliation:
Observatoire de Nice, 06304 Nice, Cedex 4, France; [email protected]
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Abstract

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We present new radial velocities for 306 bright (R < 16) galaxies in a 77 deg2 region of the Shapley supercluster, measured with the FLAIR-II spectrograph on the UK Schmidt Telescope. The galaxies we measured were uniformly distributed over the survey area, in contrast to previous samples which were concentrated in several rich Abell clusters. Most of the galaxies (230) were members of the Shapley supercluster: they trace out two previously unknown sheets of galaxies linking the Abell clusters of the supercluster. In a 44 deg2 area of the supercluster excluding the Abell clusters, these sheets alone represent an overdensity of a factor of 2·0 ± 0·2 compared to a uniform galaxy distribution. The supercluster is not flattened in the Declination direction as has been suggested in previous papers. Within our survey area the new galaxies contribute an additional 50% to the known contents of the Shapley supercluster, with a corresponding increase in its contribution to the motion of the Local Group.

Keywords

galaxies: clusters, distances and redshiftslarge-scale structure of universe
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 16 , Issue 2 , 1999 , pp. 113 - 123
Copyright
Copyright © Astronomical Society of Australia 1999

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