Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....71l..19m&link_type=abstract
Astronomy and Astrophysics, vol. 71, no. 3, Jan. 1979, p. L19-L21.
Astronomy and Astrophysics
Astronomy
27
Gamma Ray Astronomy, Pair Production, Size Determination, X Ray Sources, Electromagnetic Absorption, Extremum Values, Photons, Quasars
Scientific paper
Gamma-ray absorption by photon-photon pair production in 3C 273 is considered. A lower limit of 4 light months is placed on the size of the X-ray source, assuming that the gamma-ray source is embedded in the X-ray source and that 3C 273 is at a distance of 500 Mpc. It is concluded that if the X-ray source is found to be significantly smaller than the cited lower limit, either the X- and gamma-ray sources do not coincide or the X and gamma rays are beamed.
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