Other
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phdt........11c&link_type=abstract
Thesis (PHD). COLUMBIA UNIVERSITY , Source DAI-B 58/04, p. 1923, Oct 1997, 95 pages.
Other
Egret Blazars
Scientific paper
I present measurements of the diffuse gamma-ray emission at energies from 30 MeV to 10 GeV. Correlations of gamma-ray intensity versus H I column density confirm that most of the diffuse emission is produced by interactions between cosmic rays and interstellar matter in the Galaxy. The gamma-ray emissivity varies within the Galaxy and shows localized enhancements which may indicate an enhanced cosmic-ray density or the presence of mass other than H I. I have made the first model-independent detection of the inverse-Compton (IC) component of the diffuse emission. This component has a power law spectrum with an index of -1.88±0.14 and an average intensity of (5.0±0.8)×10-6 photons cm-2 s-1 ster-1 for E>100 MeV. The remaining component of the background radiation, presumed to extragalactic in origin, has a power law spectrum with index -2.15±0.06 and an intensity of (1.24±0.06)×10-5 photons cm-1 s-1 ster-1 for E>100 MeV. Comparing the source count distribution of EGRET blazars to the extragalactic flux, I show that the extragalactic flux and spectrum can be produced by a superposition of unresolved blazars, and I find a lower limit to the flux below which the source counts must deviate from a homogeneous population distribution.
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