Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nascp3137..145r&link_type=abstract
In NASA. Goddard Space Flight Center, The Compton Observatory Science Workshop p 145-157 (SEE N92-21874 12-90)
Astronomy and Astrophysics
Astronomy
1
Annihilation Reactions, Galaxies, Gamma Ray Astronomy, Gamma Ray Bursts, Gamma Ray Observatory, Gamma Ray Telescopes, Gamma Rays, Data Bases, Galactic Structure, Red Shift, X Rays
Scientific paper
Results from the use of the gamma ray telescope SIGMA are given. An identification and an extensive study was done of sources contributing to the emission of the Galactic center region above 30 keV. A strong line was observed at 480 keV from Nova Muscae, which may be interpreted as an annihilation line with a redshift due to the presence of a compact object. The soft x-ray tails observed by SIGMA in some transient sources already identified as soft x-ray transients might be a common characteristic of these objects and has to be explained. The unusual spectrum of NGC4151 with a break around 50 keV can characterize a particular state of this kind of object. If it is the case, it has interesting implications for the origin of the Cosmic Diffuse Background.
Roques Jean Pierre
Vedrenne Gilbert
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