Degree Type

Dissertation

Date of Award

1982

Degree Name

Doctor of Philosophy

Department

Physics and Astronomy

Abstract

The detection of gamma rays with energies greater than 500 GeV from the variable X-ray source Cygnus X-3 is reported. The gamma ray emission is modulated at the same 4.8 hour period as the X-ray emission and the peak in the gamma ray light curve is in phase with the X-ray maximum. The gamma ray signal above 500 GeV is found to be 10.9 (+OR-) 2.5% of the cosmic ray background, corresponding to a flux of 8 x 10('-11) photons/cm('2)-sec averaged over the cycle.;The galactocentric distribution of gamma ray emissivity is derived from the galactic longitude flux profile of 70 MeV to 5 GeV gamma rays as seen by the COS-B satellite. With the assumption that the gamma ray sources are distributed like the total emmissivity, it is found that 30% of the total emission is contributed by the discrete sources. This result is independent of the luminosity function of the source population.

DOI

https://doi.org/10.31274/rtd-180813-5186

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Christopher Paul Godfrey

Language

en

Proquest ID

AAI8224218

File Format

application/pdf

File Size

101 pages

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