GINGA observation of distant galaxy clusters - Temperature and iron abundance of A 2507 and A 483

Details GINGA observation of distant galaxy clusters - Temperature and iron abundance of A 2507 and A 483 GINGA observation of distant galaxy clusters - Temperature and iron abundance of A 2507 and A 483

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...243...56a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 243, no. 1, March 1991, p. 56-66. Research supported by INSU and CNES.

Astronomy and Astrophysics

Astrophysics

22

Galactic Clusters, Galactic Evolution, Ginga Satellite, Intergalactic Media, Iron, Metallicity, Satellite Observation, Abundance, Interstellar Gas, Japanese Space Program, X Ray Sources, X Ray Spectroscopy

Scientific paper

The emission measure, temperature, and iron abundance of A 2507 and A 483 are measured and it is shown that the determination of these quantities is free from any systematic bias (due to background subtraction or the choice of the atomic physics model) and that the uncertainties simply reflect the statistics of the measures. Since remote clusters of galaxies are very weak sources whose emission is expected to be appreciably detected only in the top layer, access to the data corresponding to the two layers separately is essential in this case, i.e., increase of the signal to noise ratio and better estimate of background level. It is noted that these two clusters are the most remote ones for which such spectroscopic quantities have ever been determined, therefore, it is interesting to compare them to nearby clusters and to test for possible evolutionary effects.

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