The soft gamma-ray telescope (35-1300 keV) SIGMA aboard the high energy GRANAT space observatory has been monitoring the Galactic Bulge region for more than 2000 h of effective time since March 1990. In the resulting average 35-75 keV image we detected ten sources at a level of greater than 5 standard deviations, 6 of which can be identified with low mass X-ray binaries (LMXB). Among them, one is the 1993 X-ray nova in Ophiuchus (GRS 1726-249), one is an X-ray pulsar (GX 1+4), two are associated with X-ray bursters (GX 354-0 and A 1742-294) and two with bursting X-ray binaries in the globular clusters Terzan 2 and Terzan 1. Their spectral and long term variability behavior as measured by SIGMMA are presented and discussed.


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    Title :

    Sigma observations of the low mass X-ray binaries of the galactic bulge


    Contributors:
    Goldwurm, A. (author) / Denis, M. (author) / Paul, J. (author) / Faisse, S. (author) / Roques, J. P. (author) / Bouchet, L. (author) / Vedrenne, G. (author) / Mandrou, P. (author) / Sunyaev, R. (author) / Churazov, E. (author)

    Published in:

    Publication date :

    1995-05-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English


    Keywords :


    SIGMA Observations of the Low Mass X-Ray Binaries of the Galactic Bulge

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