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Optical and X-ray analysis of the galaxy cluster A3921

Published online by Cambridge University Press:  06 October 2004

C. Ferrari ,
C. Benoist ,
S. Maurogordato ,
A. Cappi ,
E. Slezak ,
E. Belsole ,
J. L. Sauvageot ,
H. Bourdin  and
G. W. Pratt
C. Ferrari
Affiliation:
Institut für Astrophysik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Austria CERGA, UMR 6527, CNRS, Observatoire de la Cte d'Azur, BP 4229, Le Mont-Gros, 06304 Nice Cedex 4, France
C. Benoist
Affiliation:
CERGA, UMR 6527, CNRS, Observatoire de la Cte d'Azur, BP 4229, Le Mont-Gros, 06304 Nice Cedex 4, France
S. Maurogordato
Affiliation:
CERGA, UMR 6527, CNRS, Observatoire de la Cte d'Azur, BP 4229, Le Mont-Gros, 06304 Nice Cedex 4, France
A. Cappi
Affiliation:
INAF, Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, Italy
E. Slezak
Affiliation:
CERGA, UMR 6527, CNRS, Observatoire de la Cte d'Azur, BP 4229, Le Mont-Gros, 06304 Nice Cedex 4, France
E. Belsole
Affiliation:
Service d'Astrophysique, CEA Saclay, L'Orme des Merisiers Bât 709, F-91191 Gif-sur-Yvette, France H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, U.K.
J. L. Sauvageot
Affiliation:
Service d'Astrophysique, CEA Saclay, L'Orme des Merisiers Bât 709, F-91191 Gif-sur-Yvette, France
H. Bourdin
Affiliation:
CERGA, UMR 6527, CNRS, Observatoire de la Cte d'Azur, BP 4229, Le Mont-Gros, 06304 Nice Cedex 4, France
G. W. Pratt
Affiliation:
Service d'Astrophysique, CEA Saclay, L'Orme des Merisiers Bât 709, F-91191 Gif-sur-Yvette, France Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany
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Abstract

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We present the analysis and results of a new spectroscopic and photometric survey of the central 1.5 ${\rm Mpc}^2$ region of the galaxy cluster A3921 (z=0.094). We detect the presence of two dominant clumps of galaxies with a mass ratio of $\sim$4-5: a main cluster centered on the BCG (A3921-A), and a NW sub-cluster (A3921-B) hosting the second brightest cluster object. By comparing optical results to the X-ray analysis of XMM observations (Belsole et al. 2004), we find that A3921-B is tangentially traversing the main cluster along a SW/NE direction. The analysis of stellar populations of more than one hundred cluster members reveals that the merger event has probably affected the kinematics and spectral properties of the active galaxies in A3921.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. 188 - 192
Copyright
© 2004 International Astronomical Union