Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...490..619s&link_type=abstract
Astrophysical Journal v.490, p.619
Astronomy and Astrophysics
Astronomy
72
Acceleration Of Particles, Gamma Rays: Theory, Shock Waves, Ism: Supernova Remnants
Scientific paper
Assuming that supernova shocks accelerate nonthermal particles, we model the temporally evolving nonthermal particle and photon spectra at different stages in the lifetime of a standard shell-type supernova remnant (SNR). A characteristic nu F nu spectrum of an SNR consists of a peak at radio through optical energies from nonthermal electron synchrotron emission and another high-energy gamma-ray peak due primarily to secondary pion production, nonthermal electron bremsstrahlung, and Compton scattering. We find that supernova remnants are capable of producing maximum gamma-ray luminosities >~1035 ergs s-1 if the density of the local interstellar medium is >~10 cm-3. This emission will persist for >~105 yr after the supernova explosion because of the long energy loss timescales for electrons with kinetic energy ~1 GeV. This long gamma-ray lifetime implies that SNRs with a wide range of ages could be gamma-ray sources and could constitute some of the unidentified EGRET sources.
Dermer Charles D.
Mattox John R.
Skibo Jeffery G.
Sturner Steven J.
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