Optical observations of serendipitous EXOSAT sources in the Coma Cluster

Details Optical observations of serendipitous EXOSAT sources in the Coma Cluster Optical observations of serendipitous EXOSAT sources in the Coma Cluster

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40..647b&link_type=abstract

(ESA, ESLAB Symposium on X-Ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984) Space Science Reviews

Astronomy and Astrophysics

Astronomy

1

Exosat Satellite, Galactic Clusters, X Ray Astronomy, Active Galactic Nuclei, Heao 2, Sensitivity, Visible Spectrum

Scientific paper

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.

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