The X ray morphology of the relaxed cluster of galaxies A2256. 2: Sources around the extended cluster emission

Details The X ray morphology of the relaxed cluster of galaxies A2256. 2: Sources around the extended cluster emission The X ray morphology of the relaxed cluster of galaxies A2256. 2: Sources around the extended cluster emission

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991tpsu.rept..197h&link_type=abstract

In its Traces of the Primordial Structure in the Universe p 197-203 (SEE N92-29833 20-90)

Astronomy and Astrophysics

Astronomy

1

Galactic Clusters, Morphology, X Ray Astronomy, X Rays, Rosat Mission, Sky Surveys (Astronomy), X Ray Imagery, X Ray Sources

Scientific paper

X-ray emission from cluster galaxies as well as from 'dark objects' (i.e. not visible on the Palomar Observatory Sky Survey (POSS)) seen in the x-ray observation of A2256 with the imaging proportional counter on board ROSAT (x-ray astronomy satellite), is reported. This observation revealed significantly more sources in the field around the extended cluster emission than one would expect 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+42 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.

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