Spring, 1997 it GRANAT/SIGMA observations of the Galactic Center: discovery of the X-ray nova GRS 1737-31

Details Spring, 1997 it GRANAT/SIGMA observations of the Galactic Center: discovery of the X-ray nova GRS 1737-31 Spring, 1997 it GRANAT/SIGMA observations of the Galactic Center: discovery of the X-ray nova GRS 1737-31

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...342..496t&link_type=abstract

Astronomy and Astrophysics, v.342, p.496-501 (1999)

Astronomy and Astrophysics

Astrophysics

7

Stars: Individual: 1E 1740.7-2942, Stars: Individual: Gro J1744-28, Stars: Individual: Grs 1737-31, Stars: Novae, Cataclysmic Variables, Gamma Rays: Observations, X-Rays: Stars

Scientific paper

The results of GRANAT/SIGMA hard X-ray observations of the Galactic center in March, 1997 are reported. One new source - GRS 1737-31 and two previously known sources - 1E 1740.7-2942 and GRO J1744-28 were detected. The spectral and temporal behavior of GRS 1737-31 suggests that this source may be a distant X-ray Nova and a black hole candidate. The comparison of the hard X-ray transient detection rates by GRANAT/SIGMA and currently operating all-sky monitors (CGRO/BATSE, GRANAT/WATCH) leads to following conclusions regarding the spatial and luminosity distributions of the hard X-ray transients: (i) the spatial distribution of X-ray Novae exhibits a concentration towards the Galactic Center similar to the distribution of the visible matter in the Galaxy. In particular, it is more concentrated than Galactic disk population. (ii) if hard X-ray transients follow distribution of visible mass in the Galaxy then their peak luminosity in the 35-150 keV band is close to 10(37) erg s(-1) with a relatively small scatter.

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