The gamma-ray luminosity of spiral galaxies - Its evolution and its contribution to the diffuse background above 100 MeV

Details The gamma-ray luminosity of spiral galaxies - Its evolution and its contribution to the diffuse background above 100 MeV The gamma-ray luminosity of spiral galaxies - Its evolution and its contribution to the diffuse background above 100 MeV

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ap%26ss..56..403l&link_type=abstract

Astrophysics and Space Science, vol. 56, no. 2, July 1978, p. 403-414.

Astronomy and Astrophysics

Astrophysics

22

Background Radiation, Diffuse Radiation, Galactic Radiation, Gamma Rays, Luminous Intensity, Spiral Galaxies, Galactic Evolution, Photons, Sas-2, Space-Time Functions

Scientific paper

The contribution of normal spiral galaxies to the high-galactic-latitude gamma-ray background above 100 MeV is examined in the light of estimates of its flux from SAS 2 measurements. The gamma-ray luminosity of each object is inferred from the known Milky Way value normalized to the corresponding optical quantity. Several possibilities are considered for the responsible physical production mechanism, both diffuse and localized; they are then set to evolve with the galactic age according to three well-known evolutionary models. A final space-time integration leads to results which are expressed in the same unit as the measured background. It is seen that the model presented can play an important role in the region above 100 MeV, where information on the spectral shape of the radiation is still very poor. Experimental tests for future gamma-ray observations are presented.

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