Other
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.5505d&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #55.05; Bulletin of the American Astronomical Society, Vol. 28, p.1346
Other
Scientific paper
There are 96 unidentified sources of > 100 MeV radiation detected with the EGRET instrument on the Compton Gamma Ray Observatory, of which 40 are at low latitudes (|b|< 10(deg) ). We have developed a statistical test that shows a strong association between the low-latitude gamma -ray sources and young pulsars with spin-down ages <10(6) yrs. The pulsars are not, however, positionally coincident with the gamma -ray sources. We explain this result if some gamma -ray sources are SNRs that are undetected at other wavelengths with a pulsar witness, leaving the scene at hundreds of km s(-1) , marking the location of the gamma -ray bright SNRs. Numerical simulations of particle acceleration and radiation from SNRs are presented which show that > 100 MeV gamma rays from secondary pion production can dominate the emission if the ratio of SN energy going into nonthermal electrons and protons varies considerably from source to source. If protons diffuse through the interstellar medium with mean free paths much shorter than the mean free paths of electrons, we also expect to find SNRs which are bright at gamma -ray energies.
Dermer Carles D.
Mattox John R.
Sturner Steven J.
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