Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725617s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #256.17; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Observations of few-keV synchrotron radiation emitted by accelerated electrons in supernova-remnant shocks using telescopes such as Chandra and XMM has provided strong evidence that acceleration of (Galactic) cosmic rays is occurring through the diffusive shock acceleration mechanism. These same remnants often show a power-law-like higher energy X-ray spectrum when observed with telescopes such as Suzaku or the Rossi X-ray Timing Explorer. In the past we have used a spatially-resolved spectroscopic analysis of Chandra extrapolate the integrated synchrotron spectrum for such remnants, and preliminary results suggest there is not enough total synchrotron emission to explain the high energy spectrum--we conclude emission is likely also contributed from non-thermal electrons through bremsstrahlung. However, the calculations are difficult because of projection effects; thermal emission of remnant ejecta is bright in the spatially-resolved band and some lines-of-sight may contain regions emitting through multiple mechanisms. Here we consider what fraction of synchrotron radiation might be "missed" in our integrated spectrum by fitting simulated spectra containing both thermal and synchrotron emission with appropriate values for Cas A. This work is supported by the Chandra General Observer Program Grant AR9-0008X.
Allen Glenn E.
Stage Michael D.
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