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Sigma observations of the low mass X-ray binaries of the galactic bulge (1995)

Goldwurm, A. ; Denis, M. ; Vedrenne, G. ; [et al.]

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Publication Date: 2019-04-02

Description: 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.

Keywords: ASTRONOMY

Type: Advances in Space Research (ISSN 0273-1177); 15; 5; p. (5)-41-(5)44

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