X-ray substructure in A1656 and A2256

Details X-ray substructure in A1656 and A2256 X-ray substructure in A1656 and A2256

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105..409d&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 2, p. 409-416.

Astronomy and Astrophysics

Astronomy

46

Galactic Clusters, Galactic Structure, Intergalactic Media, X Ray Imagery, X Ray Sources, Bremsstrahlung, Gas Dynamics, Heao 2, Rosat Mission

Scientific paper

We report the confirmation of X-ray substructure in two rich clusters of galaxies, A1656 (Coma) and A2256. Using data from the Einstein Observatory imaging proportional counter, we present a technique of fitting the cluster profile and searching for contributions to the X-ray emission from small regions within the cluster. Using this method we find substructure in both A1656 and A2256 while simultaneously fitting the cluster profile. We obtain the ellipticity and position angle of both clusters as a function of radius and find that both have ellipticity and position angles which vary with radius. We interpret the existence of substructure along with the variable ellipticity and position angle as evidence for a recent merger in both of these clusters.

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