Astron. Astrophys. 321, 64-70 (1997)

An X-ray and radio study of the cluster A 2717

H. Liang ¹, M. Pierre ¹, A. Unewisse ^{2, 3} and R.W. Hunstead <sup>2

1</sup> CEA/DSM/DAPNIA CE Saclay, Service d'Astrophysique, F-91191 Gif-sur-Yvette, France
² School of Physics, The University of Sydney, NSW 2006, Australia
³ Electronic and Surveillance Research Lab., DSTO, Salisbury, SA 5108, Australia

Received 25 July 1996 / Accepted 18 September 1996

Abstract

We present an X-ray, radio and optical study of the cluster A 2717. The central D galaxy is associated with a Wide-Angled-Tailed (WAT) radio source. A Rosat PSPC observation of the cluster shows that the cluster has a well constrained temperature of K. The pressure of the intracluster medium was found to be comparable to the mininum pressure of the radio source suggesting that the tails may in fact be in equipartition with the surrounding hot gas.

Key words: galaxies: clusters of clusters: individual: Abell 2717 dark matter X-rays: galaxies radio continuum: galaxies

Send offprint requests to: H. Liang

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Contents

• 1. Introduction
• 2. X-ray observations
  • 2.1. Analysis of the X-ray data
    • 2.1.1. Discrete sources
    • 2.1.2. The cluster
• 3. Mass distributions
• 4. Radio observations
  • 4.1. Analysis of radio data
• 5. Pressure balance
  • 5.1. Thermal pressure
  • 5.2. Minimum radiation pressure
• 6. Conclusions
• Acknowledgements
• References

© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998
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