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Date and Time of the Query: 2019-08-17 T10:56:01 PDT
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For refcode 1994A&A...289..763J:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1994A&A...289..763J ROSAT PSPC observations of globular clusters Helen M. Johnston, Frank Verbunt, and Gunther Hasinger Astronomical Institute, Utrecht University, P.O.Box 80000, NL-3508 TA Utrecht, The Netherlands Max Planck Institute for Extraterrestrial Physics, D-85748 Garching, Germany Received 29 October 1993 / Accepted 19 March 1994 Abstract. We present deep pointed observations of nine globular clusters obtained with the Rosat PSPC. The clusters observed were selected to be nearby, have low interstellar absorption towards them, and to have high collision number. X-ray sources are detected in the cores of seven of them, at luminosities of ~1-6 x 10^32^ erg s^-1^. At least two of these are multiple.The sources are too dim to obtain spectra of them, but analysis of the X-ray colours indicates that their spectra are not all identical. Four of the seven have colours indicating soft spectra, with blackbody temperatures kT <~ 0.3 keV. Soft spectra can be excluded for the other three sources. Key words: globular clusters;general - X-rays; general
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