Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.3803l&link_type=abstract
American Astronomical Society, HEAD meeting #10, #38.03
Astronomy and Astrophysics
Astronomy
Scientific paper
Although efficient cosmic-ray acceleration to energies greater than 100 TeV at young supernova remnants (SNRs) has been established observationally, the dominance of protons expected by the non-linear diffusive shock acceleration (NL-DSA) theory at the highest energy range has not been confirmed unambiguously. The uncertainties arise mainly from the fact that the predicted radiation, particularly the ratio of inverse-Compton (IC) from electrons to neutral pion decay from protons, depends importantly on poorly constrained environmental and model parameters. On the observational side, the broadband emission from radio to TeV gamma-rays is measured with varying spatial and spectral resolution. The efficiency of NL-DSA and the composition of accelerated particles can only be determined when the amorphous mix of data is analyzed consistently with the acceleration model.
We present here a 3-dimensional model of Type Ia SNRs where the hydrodynamical evolution of the remnant is modeled consistently with NL-DSA including particle escape, diffusion outside of the forward shock, and particle interactions with the ambient material. We include synchrotron emission and cooling, bremsstrahlung radiation, neutral pion production, IC, and Coulomb energy-loss. Boardband spectra have been calculated for typical environments including a dense region of gas external to a 1000 year old SNR. Our model can adapt to various SNR environments and predict cosmic ray spectra and multi-wavelength morphology in projected images for instruments with varying spatial and spectral resolutions. We show the importance of measurements in the hard X-ray, GeV and >10; TeV gamma-ray band for understanding the acceleration mechanism. The Gamma Ray Large Area Telescope (GLAST) is expected to fill in the GeV energy gap which is vital to the verification of the SNR origin of Galactic cosmic rays.
Ellison Donald
Kamae Teturo
Lee Shiu-Hang Herman
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