Multi-wavelength Modeling Of SNRs: Implications On Cosmic Ray Acceleration

Details Multi-wavelength Modeling Of SNRs: Implications On Cosmic Ray Acceleration Multi-wavelength Modeling Of SNRs: Implications On Cosmic Ray Acceleration

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21713004a&link_type=abstract

American Astronomical Society, AAS Meeting #217, #130.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

A spectral study of non-thermal filaments is carried out with data from a deep Chandra observation of Cassiopeia A, a young supernova remnant (SNR). The diffusion model applied explains the properties observed, such as the spectral hardening going outward, and allows for an estimation of the magnetic field, level of turbulence and shock obliquity. Using these results, and combining
archival data taken at radio and infrared wavelengths with state-of-the-art measurements at X-ray and gamma-ray energies, a spectral energy distribution (SED) is assembled and modeled. The non-thermal SED is explained partly with a two-zone leptonic model. Synchrotron emission from the electrons can account for data from radio to X-ray wavelengths. Much of the GeV-TeV emission can also be explained by a combination of bremsstrahlung emission and inverse Compton scattering of infrared photons. However, the model cannot fit a
distinct feature at GeV energies. This feature can be well accounted for by a
pion-zero emission component to the model, providing evidence for cosmic ray
production in Cas A. A similar SED is assembled for Tycho's SNR. The results do not allow to conclude anything firmly, although the leptonic scenario for this case might be able to explain the data.

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