Observations of the Extended X-Ray Sources in the Perseus and Coma Clusters from UHURU

Abstract

view Abstract Citations (126) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Observations of the Extended X-Ray Sources in the Perseus and Coma Clusters from UHURU Forman, W. ; Kellogg, E. ; Gursky, H. ; Tananbaum, H. ; Giacconi, R. Abstract The X-ray source in Perseus identified as NGC 1275 is found to have a finite angular extent of about 33 arc minutes. The improved location of the center of the emission is consistent with NGC 1275. An improved location for the center of the Coma X-I source is consistent both with the kinematic center of the cluster and with NGC 4874. The Perseus X-ray spectrum fits a powerlaw index of 1.09 + 0.07; the Coma spectrum fits either a power law of index 1.01 1 0.10 or a thermal-bremsstrahlung spectrum with kT = 5.3 1 0.6 keV. These extended sources-Coma, Perseus, and the source in the Virgo cluster-may be a new class of X-ray objects associated with active galaxies in rich clusters. Publication: The Astrophysical Journal Pub Date: December 1972 DOI: 10.1086/151791 Bibcode: 1972ApJ...178..309F full text sources ADS | data products SIMBAD (8) NED (4)