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ESO distant cluster survey: spectroscopy

Published online by Cambridge University Press:  06 October 2004

C. Halliday ,
B. Milvang-Jensen ,
S. Poirier ,
B. M. Poggianti ,
P. Jablonka ,
A. Aragóon-Salamanca ,
R. Pelló ,
R. P. Saglia ,
G. De Lucia  and
L. Simard
...Show all authors
C. Halliday
Affiliation:
Osservatorio Astronomico, vicolo dell'Osservatorio 5, 35122 Padova
B. Milvang-Jensen
Affiliation:
Max-Planck Institut für extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching
S. Poirier
Affiliation:
GEPI, CNRS-UMR8111, Observatoire de Paris, F-92195 Meudon Cedex, France
B. M. Poggianti
Affiliation:
Osservatorio Astronomico, vicolo dell'Osservatorio 5, 35122 Padova
P. Jablonka
Affiliation:
GEPI, CNRS-UMR8111, Observatoire de Paris, F-92195 Meudon Cedex, France
A. Aragóon-Salamanca
Affiliation:
School of Physics and Astronomy, University of Nottingham, NG7 2RD, UK
R. Pelló
Affiliation:
Laboratoire d'Astrophysique, UMR 5572, Observatoire Midi-Pyrenees, 31400 Toulouse
R. P. Saglia
Affiliation:
Max-Planck Institut für extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching
G. De Lucia
Affiliation:
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85741 Garching
L. Simard
Affiliation:
Herzberg Institute of Astrophysics, N. R. C. of Canada, Victoria, BC V9E 2E7, Canada
D. I. Clowe
Affiliation:
Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721
G. Rudnick
Affiliation:
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85741 Garching
S. D. M. White
Affiliation:
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85741 Garching
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Abstract

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We present first results for spectroscopic observations of galaxies in 4 clusters at $z=0.7-0.8$ and one cluster at $z=0.5$ observed by the ESO Distant Cluster Survey (EDisCS). Our spectroscopic catalogues contain 236 cluster members of our 5 clusters, and the number of members per cluster ranges from 30 to 67. Our cluster velocity dispersions are between $\sim$400 and over 1000 $\rm{km s}^{-1}$. Galaxy redshift distributions are found to be non-Gaussian and we find evidence for significant substructure in two clusters, one at $z \sim 0.79$ and another at $z \sim 0.54$; both clusters have velocity dispersions exceeding 1000 $\rm{km~s}^{-1}$. These systems have clearly not yet virialised at these epochs in qualitative agreement with CDM scenarios and their cluster velocity dispersions should not be used in the measurement of cluster mass. Our clusters have a wide range of different cluster velocity dispersions, richnesses and substructuring, and our spectroscopic data set is allowing a comprehensive insight into cluster galaxy evolution as a function of redshift and environment.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUC195 , March 2004 , pp. 236 - 238
Copyright
© 2004 International Astronomical Union

Footnotes

Based on observations collected at the European Southern Observatory, Chile (166.A–0162).