Other
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.3703l&link_type=abstract
American Astronomical Society, 192nd AAS Meeting, #37.03; Bulletin of the American Astronomical Society, Vol. 30, p.864
Other
4
Scientific paper
Abell 963 (z = 0.2) is an X-ray luminous, centrally concentrated cluster of galaxies with a dominant central cD galaxy. A963 also has two large diametrically opposed gravitational arcs associated with it, for which the origin from a single background galaxy is still uncertain. We will present the results from two observational programs on A963: 1) Redshifts have been obtained for a total of 79 objects in the field of A963, consisting of 56 clusters members, 21 galaxies which are either foreground or background, and 2 galactic stars. We have used a subset of 36 red cluster members, for which spectra were obtained during a single observing run, to determine the cluster velocity dispersion. We find a value of ~ 1350 km s(-1) (+200,-150) for sigma _r, the rest-frame radial velocity dispersion, which is similar to other known lensing clusters. 2) ROSAT HRI observations of A963 reveal the cluster X-ray gas to be centrally concentrated and ellipsoidal rather than spherical in shape. Preliminary values for the core radius, r_c, and the ellipticity, epsilon , are ~ 25'' and ~ 0.25, respectively. While this ellipticity is less than that of the central cD galaxy, which has epsilon = 0.5, the X-ray gas and the cD galaxy are aligned along the same axis.
Henry Patrick J.
Lavery Russell J.
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