Astron. Astrophys. 326, 34-44 (1997)

X-ray/optical analysis of the cluster of galaxies Abell 1300: indications of a post-merger at z = 0.31

L. Lémonon ¹, M. Pierre ¹, R. Hunstead ², A. Reid ², Y. Mellier ^{3, 4} and H. Böhringer <sup>5

1</sup> CEA Saclay DSM/DAPNIA/SAp, Service d'Astrophysique, F-91191 Gif-sur-Yvette, France
² School of Physics, The University of Sydney, NSW 2006, Australia
³ Institut d'Astrophysique de Paris, 98bis Boulevard Arago, F-75014 Paris, France
⁴ Observatoire de Paris, DEMIRM, 61 avenue de l'Observatoire, F-75014 Paris, France
⁵ Max-Planck-Institut für Extraterrestrische Physik, D-85740 Garching, Germany

Received 16 January 1997 / Accepted 11 April 1997

Abstract

We present ROSAT PSPC and HRI observations of the distant cluster A 1300 () in conjunction with optical data, to investigate the physics of the intra-cluster medium and the dynamical state of the cluster. By means of a multi-resolution wavelet analysis, we find evidence for structures in the X-ray emission of this very luminous (  erg s^-1 in the 0.1-2.4 keV band) and massive ( at a radius 2.2 Mpc) cluster. This cluster is significant as we appear to be witnessing the end of a merger which occurred at an early epoch.

Key words: galaxies: clusters: general galaxies: clusters: individual: Abell 1300 cosmology: observations dark matter X-rays: galaxies

Send offprint requests to: L. Lémonon llemonon@cea.fr

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Contents

• 1. Introduction
• 2. Optical data
  • 2.1. Observations
  • 2.2. Quick photometric analysis
  • 2.3. Spectroscopy
• 3. X-ray data
  • 3.1. Observations
  • 3.2. Source detection
  • 3.3. X-ray morphology
  • 3.4. Surface brightness
  • 3.5. Spectral analysis
  • 3.6. Total luminosity
  • 3.7. Mass determination
• 4. Discussion and conclusions
• Acknowledgements
• References

© European Southern Observatory (ESO) 1997

Online publication: April 20, 1998
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