Discovery of 0.5 million K gas in the center of galaxy clusters.

Details Discovery of 0.5 million K gas in the center of galaxy clusters. Discovery of 0.5 million K gas in the center of galaxy clusters.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..557l&link_type=abstract

International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 557 - 560

Astronomy and Astrophysics

Astrophysics

2

Intracluster Gas: Extreme Uv, Clusters Of Galaxies: Coma, Clusters Of Galaxies: Virgo, Clusters Of Galaxies: Cooling Flows

Scientific paper

An observation of M87, the central galaxy of the Virgo cluster, was performed in the 0.065-0.245 keV energy band by the deep survey (DS) telescope aboard the Extreme Ultraviolet Explorer (EUVE). A central source and an extended emission halo of radius ≡120 kpc are clearly visible in the data and represent the first detection of cluster gas emission in the EUV. The emission cannot be explained by the well-known cluster gas at X-ray temperatures. Instead, it is necessary to introduce a second gas component, with temperature between 5×105 and 106K. The rapid cooling of plasmas at such temperatures implies a mass accretion rate of >300 Msun/yr. It is unlikely that the phenomenon is directly related to a cooling flow, which involves a much lower rate of ≡10 Msun/yr. More recently, the authors examined ROSAT PSPC data of other galaxy clusters located in directions of low galactic absorption, and found that all of them show evidence of extended central emission at T ≍ 106K. In particular, the Coma cluster, which was also detected by the EUVE sky survey, exhibits soft emission out to a radius of ≡1 Mpc from the X-ray centroid, with an estimated gas cooling (accretion) rate of ≡2×105Msun/yr. This result is a major surprise, since Coma does not have a cooling flow.

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