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T.G. Pannuti, G.E. Allen (MIT)
A small but growing number of Galactic supernova remnants (SNRs) are known to feature non-thermal components in their X-ray spectra. Some of these SNRs also exhibit thermal X-ray emission, while the X-ray emission from the other SNRs is exclusively non-thermal. The study of non-thermal X-ray emission from SNRs has attracted a considerable amount of interest from both theoretical and observational perspectives, but our understanding of this phenomenon is still incomplete. Unresolved issues include the process responsible for producing this emission (synchrotron or non-thermal bremsstrahlung) and the physical conditions which are conducive to its production. We are conducting a broadband (approximately 0.5-20 keV) study of non-thermal X-ray emission from a sample of Galactic SNRs, as observed by the ROSAT, ASCA, RXTE, Chandra and XMM-Newton observatories. We will present the results of our study of the non-thermal X-ray emission from the SNRs G156.2+5.7 (as observed by ROSAT, ASCA and RXTE) and G266.2-1.2 (as observed by ROSAT, ASCA, RXTE and Chandra): the former SNR is known to exhibit both thermal and non-thermal X-ray emission, while the latter SNR exhibits non-thermal X-ray emission exclusively. Preliminary results and initial conclusions from this work will be presented and discussed. T.G.P. acknowledges support for this work from NASA LTSA grant NAG5-9237.
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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.