Other
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.6704d&link_type=abstract
American Astronomical Society, 182nd AAS Meeting, #67.04; Bulletin of the American Astronomical Society, Vol. 25, p.914
Other
Scientific paper
In our continuing study of medium redshift clusters (0.2 < z <0.3) we have obtained ROSAT PSPC observations of Abell 222/223, Abell 777 and Abell 1758. These objects exhibit the "Butcher-Oemler" effect, that is they have an increased fraction of blue galaxies when compared to lower redshift clusters. Our ROSAT PSPC observations reveal that these clusters consist of multiple components. Abell 222/223 and Abell 777 are double clusters and Abell 1758 is at least a double system. These X-ray observations show another extended x-ray source ~ 6' to the south of the optical center of A1758. Fits to the ROSAT spectra for A1758 give a best fit temperature of T ~ 3.4 kev, much lower than for nearby rich clusters indicating that this cluster may not be fully virialized. The southern source is well fit with a thermal plasma model with a temperature of 2.9 keV and very low metal abundance. If this source is at the same redshift as A1758 then this cluster may be in the process of a double merger. One interesting result from the X-ray data is that most of the clusters which show strong structure have a low blue galaxy fraction and the clusters with a higher fraction of blue galaxies have no multiple components. Of the Butcher-Oemler clusters between 0.2 < z <0.3 with X-ray data only 13% of the clusters with a blue fraction above 0.10 have multiple X-ray components while 60% of the clusters with a blue fraction below 0.10 have multiple components. While this result is not statistically compelling it may be a clue to the origin of the excess blue galaxies.
Davis David S.
Mushotzky Richard F.
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