Galaxy Cluster Cosmic-rays, Hot Gas, X-rays and Collisions

Details Galaxy Cluster Cosmic-rays, Hot Gas, X-rays and Collisions Galaxy Cluster Cosmic-rays, Hot Gas, X-rays and Collisions

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....4...48s&link_type=abstract

Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o

Physics

Scientific paper

Excess EUV radiation from some clusters of galaxies accessible to ROSAT measurements in the 100-1000 eV energy range is reanalysed employing multi-temperature, thin plasma code emission fits. For both clusters, A1795 and Virgo, two hot components, with logT~7.8 and 6.6, and a warm component, with logT~5.7, are found. The two hot components are discussed in terms of a cluster-cluster collision model. The warm component for A1795 is reanalysed in terms of a broken power law, which could be ascribed to inverse Compton radiation arising from CMB interaction with a relativistic intergalactic cosmic-ray gas. It is suggested that the warm component from the Virgo central region is due to cosmic-rays escaping from M87. This lessens the argument requiring baryonic matter as the dominant mass component of A1795 or Virgo.

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