Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246l..14h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 1, June 1991, p. L14-L16. Research supported by BMFT.
Astronomy and Astrophysics
Astronomy
26
Galactic Clusters, Galactic Radiation, Rosat Mission, X Ray Imagery, X Ray Sources, Brightness Distribution, Proportional Counters, Spaceborne Astronomy
Scientific paper
The X-ray observation of A2256 with the imaging proportional counter on board the X-ray observatory Rosat revealed significantly more sources in the field around the extended cluster emission than expected by chance. In a preliminary investigation, 14 sources were discovered at the limiting flux for this exposure whereas about 7 sources would have been expected by chance. At least two of those sources are coincident with cluster-member galaxies, having X-ray luminosities of approximately 10 to the 42nd erg/s in the Rosat energy band from 0.1 to 2.4 keV, but at least four more are from 'dark' objects. The similarity of these objects to those in A1367 suggests the existence of a new class of X-ray sources in clusters.
Briel Ulrich G.
Henry Patrick J.
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