Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.252..394d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 252, Oct. 1, 1991, p. 394-402. Research supported by Ro
Astronomy and Astrophysics
Astronomy
35
Galactic Clusters, Ginga Satellite, Spaceborne Astronomy, X Ray Astronomy, X Ray Sources, Point Sources, Proportional Counters
Scientific paper
The results of scanning and pointed X-ray observations of a region of about 40 square degrees in the vicinity of the rich cluster Shapley 8, in the Shapley Supercluster of galaxies are presented. The Shapley Supercluster is the richest known supercluster, and Shapley 8 is classified optically as richness class 4. No evidence is found for excess diffuse emission associated with the supercluster and obtain a strong limit on the total mass of X-ray emitting gas. Several new point sources have been discovered in the region, and the X-ray properties of Shapley 8 have been measured for the first time. Despite its apparent high optical richness, Shapley 8 is not exceptionally luminous in X-rays, being about one third of the luminosity of the highest luminosity clusters known. It is suggested that its high optical richness is in part due to neighboring clusters, four of which are now resolved in X-rays within 2 deg of Shapley 8.
Day Charles S. R.
Edge Alastair C.
Fabian Andrea C.
Raychaudhury Somak
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