Search for gamma-radiation from extragalactic objects using a likelihood method

Details Search for gamma-radiation from extragalactic objects using a likelihood method Search for gamma-radiation from extragalactic objects using a likelihood method

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....94..116p&link_type=abstract

Astronomy and Astrophysics, vol. 94, no. 1, Jan. 1981, p. 116-120. Research supported by the Centre National de la Recherche Sc

Astronomy and Astrophysics

Astronomy

72

Extraterrestrial Radiation, Galactic Radiation, Gamma Ray Astronomy, Likelihood Ratio, Radiation Sources, Spaceborne Astronomy, Bl Lacertae Objects, Cos-B Satellite, Photons, Quasars, Sas-2, Seyfert Galaxies, X Ray Sources

Scientific paper

A search through COS-B data for gamma-radiation from a number of extragalactic objects reveals no strong evidence for any positive identification except, as already reported, for the region around the quasar 3C273. Upper limits to the photon fluxes from active extragalactic objects are evaluated using a likelihood method. They reinforce the conclusion reached by Bignami et al. (1979) from the SAS-2 data that the flux upper limits lie substantially below the extrapolation of spectra measured at X-ray energies. The proposed identifications of 2CG135 plus 01 are also discussed.

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