Nonthermal Bremsstrahlung vs. Synchrotron Radiation: Cas A

Details Nonthermal Bremsstrahlung vs. Synchrotron Radiation: Cas A Nonthermal Bremsstrahlung vs. Synchrotron Radiation: Cas A

2007-09-25

arxiv.org/abs/0709.4049v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, proceedings paper for the 30th International Cosmic Ray Conference

Scientific paper

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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