Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246l..10b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 1, June 1991, p. L10-L13. Research supported by BMFT, Royal Society,
Astronomy and Astrophysics
Astronomy
144
Brightness Distribution, Galactic Clusters, X Ray Astronomy, X Ray Imagery, Cosmology, Proportional Counters, Rosat Mission, Spaceborne Astronomy
Scientific paper
The rich cluster of galaxies A2256 are studied by utilizing the imaging proportional counter on board the X-ray observatory ROSAT. A2256 is considered to be a relaxed Coma-like cluster which is dynamically well evolved. Cleara evidence, however, is found for substructure in A2256. The X-ray surface brightness distribution reveals two separate maxima in the center; one of which is coincident with the central cD galaxy while the morphology of the other shows indications that it is merging with the main cluster body. The X-ray temperatures of the two maxima are different; the probable merging object being about a factor of five cooler than the cluster. The previously measured broad velocity distribution supports the idea that a merger is occurring in this cluster.
Böhringer Hans
Briel Ulrich G.
Ebeling Harald
Edge Alastair C.
Hartner Gisela D.
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