Abstract We review the first observations of globular clusters obtained with the X-ray telescope on board of the ROSAT satellite. In the All-Sky Survey, all known bright sources and two new transient sources were detected. In addition a super-soft source was found in NGC5272. Concerning the dim sources, the survey suggests that those outside the core of ω Cen are not related to the cluster. The survey further improved by one or two magnitudes on many upper limits previously obtained by the HEAO-1 satellite. Pointed observations have improved the positional accuracy of a number of sources, and added to the number of known dim sources. In 47 Tuc, the known central source is resolved into 4 separate sources, which we argue are all soft X-ray transients. A comparison with observations of the old open cluster M67 leads us to suggest that some of the dim sources may be conglomerates of a large number of RS Can Ven type binaries.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    ROSAT observations of X-ray sources in globular clusters


    Contributors:
    Verbunt, F. (author) / Hasinger, G. (author) / Johnston, H.M. (author) / Bunk, W. (author)

    Published in:

    Advances in Space Research ; 13 , 12 ; 151-160


    Publication date :

    1993-01-01


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    ROSAT Observations of X-Ray Sources in Globular Clusters

    Verbunt, F. / Hasinger, G. / Johnston, H. M. et al. | British Library Conference Proceedings | 1993



    ROSAT Observations of Galaxy Clusters and Cosmological Implications

    Boehringer, H. / COSPAR | British Library Conference Proceedings | 1993