Mathematics – Logic
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224....1j&link_type=abstract
Astrophysical Journal, Part 1, vol. 224, Aug. 15, 1978, p. 1-13.
Mathematics
Logic
73
Galactic Clusters, Luminous Intensity, Satellite Observation, X Ray Sources, X Ray Spectra, Ariel 5 Satellite, Intergalactic Media, Oso-7, Uhuru Satellite
Scientific paper
Properties of the nearby clusters of galaxies (distance class 4 or less) identified with X-ray sources are investigated on the basis of Uhuru observations combined with Ariel 5 and OSO 7 results. General properties of the X-ray clusters, such as richness and morphological type, are discussed. X-ray spectra are presented for those clusters for which sufficient Uhuru observations are available. A fundamental relation between the clusters and their richness as defined optically by Abell is observed, such that the class of richness 2 clusters contains relatively more highly luminous X-ray sources as compared with richness 0 and 1 clusters. The observations are shown not to support the previously suggested correlations between X-ray luminosity and Bautz-Morgan or Rood-Shastry morphological type. It is proposed that the richness-luminosity correlation results from the greater number of galaxies available to produce and contain hot intergalactic gas.
Forman William
Jones Christine
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