Mathematics – Probability
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.1512r&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #15.12; Bulletin of the American Astronomical Society, Vol. 24, p.1145
Mathematics
Probability
Scientific paper
We have made a comparison of the X-ray and radio morphologies of a sample of 53 rich cluster fields using Einstein observatory IPC and VLA 20 cm images. Surprisingly, we find that the majority of the clusters examined have either X-ray subclumps centered on the radio galaxy or extensions of X-ray emission towards the radio galaxy. These results may explain the strong similarities in radio morphologies and radio luminosity functions for galaxies in and out of rich clusters. The major issue is the link between X-ray and radio emission. We ask how many radio sources are within 0.3 Abell radii of an X-ray clump? Our sample currently consists of 53 radio sources in 47 Abell clusters for which EINSTEIN IPC maps are available. The radio sources are larger than 2\arcm\ and have been mapped with the VLA. We have defined a statistical sample for which an isophotal flux could be defined in the X-rays. The flux level is 1 times 10(-3) cts/s/arcmin(2) . For the total sample, we find 44 sources within 0.3 Abell radii of an X-ray clump or 74%. For the statistical sample we find 32 out of 36 or 89%. For a King model distribution one would expect to find ~ 50% of the galaxies within 0.3 Abell radii. The distributions of the separation between the radio galaxies and the X-ray clump position, and the radio galaxies and the Abell optical cluster center have been compared. A chi (2) test has been run on the angular separation distribution between X-ray clump-radio and X-ray clump-Abell center. The result is that the probability that the two angular distributions are drawn from the same parent distribution is 7 times 10(-4) . The radio sources are more strongly associated with X-ray subclumps than with the Abell cluster centers. A chi (2) test has been run on the separation distributions (X-ray-Abell and X-ray radio) expressed in units of Abell radius. The result is that the probability that the two distributions are drawn from the same parent distribution is 3 times 10(-3) . We conclude that radio galaxies tend to occur in clumps of hot X-ray gas within rich clusters. This work was supported by NSF grant AST-9012353 and NASA grant NAGW-3152.
Burns O. Jr. J.
Owen Frazer N.
Rhee George
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