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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    Titel :

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


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

    Erschienen in:

    Erscheinungsdatum :

    1995-05-01



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


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

    Goldwurm, A. / Denis, M. / Paul, J. et al. | British Library Conference Proceedings | 1995



    VLA Observations of SIGMA Hard X-Ray Sources in the Galactic Bulge

    Marti, J. / Mirabel, I. F. / Chaty, S. et al. | British Library Online Contents | 1997


    Luminosity Function of X-ray Sources in the Galactic Bulge

    Mori, H. / Maeda, Y. / Ueda, Y. et al. | British Library Conference Proceedings | 2005


    SIGMA Observations of Hard X-Ray and Soft Gamma-Ray Emission from X-Ray Binaries

    Laurent, P. / Claret, A. / Lebrun, F. et al. | British Library Conference Proceedings | 1993