Nonthermal Bremsstrahlung vs. Synchrotron Radiation: Cas A

G. E. Allen; M. D. Stage; J. C. Houck

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arXiv · 0709.4049

Nonthermal Bremsstrahlung vs. Synchrotron Radiation: Cas A

G. E. Allen·M. D. Stage·J. C. Houck

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Abstract

We performed a spectral analysis of some Chandra ACIS and RXTE PCA data for the supernova remnant Cas A. A very large (1.1 Ms) ACIS data set is used to identify regions dominated by synchrotron radiation. The best-fit spectral models for these regions are combined to obtain a composite synchrotron model for the entire remnant. The difference between this model and the observed PCA flux is fitted with a nonthermal bremsstrahlung model. The results of this analysis suggest that (1) the ratio of the nonthermal bremsstrahlung to synchrotron radiation varies from about 2:1 to 4:1 in the 10-32 keV energy band, (2) the electron spectrum is significantly steeper at 10-32 keV than it is at 1 GeV, (3) about 5% of the electrons are nonthermal and (4) about 30% of the energy in the electron distribution is in nonthermal electrons.

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G. E. Allen, M. D. Stage, J. C. Houck. 2007-09-25. Nonthermal Bremsstrahlung vs. Synchrotron Radiation: Cas A. https://arxiv.org/abs/0709.4049

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