Observations of gamma radiation from the galactic center region

Details Observations of gamma radiation from the galactic center region Observations of gamma radiation from the galactic center region

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977esasp.124..107s&link_type=abstract

In ESA Recent Advan. in Gamma-Ray Astronomy p 107-115 (SEE N78-11899 02-88)

Astronomy and Astrophysics

Astronomy

5

Galactic Radiation, Galactic Structure, Gamma Rays, Balloon-Borne Instruments, High Altitude Balloons, Point Sources, Telescopes

Scientific paper

High resolution measurements of gamma-radiation, greater than 15 MeV, emitted from the galactic center were made during balloon flights in 1971 and 1975. The prominent feature observed in 1971 is a 29 deg wide enhancement lying along and just below the galactic equator. It is primarily confined and has an energy spectrum which appears to be dominated by pi deg-decay gamma rays greater than 50MeV, but could contain a significant contribution from bremsstrahlung or Compton processes at lower energies. If this radiation is diffuse then cosmic ray collisions on the molecular hydrogen between 4 and 8 kpc from the center is the most probable source; however, its limited extent is puzzling. Data from 1971 and 1975 show that the galactic gamma-rays detected appear to be primarily confined; concentrations that could be due to localized sources are apparent. These concentrations are near some interesting objects including a supernova remnant and two bursting X-ray sources. Also discussed is a search for bursts of high-energy gamma rays.

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