Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975rech....6...25k&link_type=abstract
La Recherche, vol. 6, Jan. 1975, p. 25-35. In French.
Astronomy and Astrophysics
Astronomy
Solar X-Rays, Spaceborne Astronomy, X Ray Astronomy, Absorbers (Materials), Black Holes (Astronomy), Crab Nebula, Galactic Nuclei, Gamma Rays, High Resolution, Lunar Occultation, Radio Sources (Astronomy), Solar Energy, X Ray Sources
Scientific paper
The Uhuru X-ray astronomy satellite tripled the number of known X-ray sources. The latest catalog lists 165 X-ray sources, two thirds of which are probably galactic sources; one third are extragalactic sources. Three types of X-ray sources have been observed in our Galaxy: nonperiodic sources, sources with periods of 1 sec or less, analogous to radio-frequency pulsars, and sources with longer periods, typically of several days. These pulsating X-ray sources are explained as neutron stars with companions or rotating neutron stars. Problems of correlating visible and X-ray emissions are considered. Gamma-ray observations are also being made to study questions relating to galactic centers. The problems of identifying the causes and locating the sources of X-ray and gamma-ray emissions are discussed. Future astronomical satellites will include Exosat, an X-ray observatory to be launched in 1979, and COS-B, the only gamma-ray satellite now projected, to be launched in 1975.
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