Optical observations of serendipitous EXOSAT sources in the Coma Cluster

Bibcode
1985SSRv...40..647B
DOI
10.1007/BF00179882
Branduardi-Raymont, G.; Mason, K. O.; Murdin, P. G.; Martin, C.; McKechnie, S. P.
Bibliographical reference

(ESA, ESLAB Symposium on X-Ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984) Space Science Reviews (ISSN 0038-6308), vol. 40, April 1985, p. 647-652.

Advertised on:
4
1985
Number of authors
5
IAC number of authors
1
Citations
1
Refereed citations
1
Description
A ≡7 hour observation of the central part of the Coma cluster of galaxies has been performed with the EXOSAT LE telescopes and CMA detectors. Five serendipitous sources are detected within the inner 35 arcmin radius of the field. Optical spectroscopy demonstrates that at least three of these are background AGN not associated with the cluster. At the sensitivity level of EXOSAT exposure, one would have expected to see only 0.01 background sources based on the Einstein Medium Sensitivity Survey. The EXOSAT and Einstein results may be reconciled if these AGN have a much softer average X-ray spectrum than previously assumed.
Type
Refereed
Active galactic nuclei

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