Probing Particle Acceleration Sites in Supernova Remnants Observed in X-rays and Radio

Details Probing Particle Acceleration Sites in Supernova Remnants Observed in X-rays and Radio Probing Particle Acceleration Sites in Supernova Remnants Observed in X-rays and Radio

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21335902l&link_type=abstract

American Astronomical Society, AAS Meeting #213, #359.02; Bulletin of the American Astronomical Society, Vol. 41, p.502

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We present results from a recent campaign to quantify the morphologies of supernova remnants (SNRs) observed with the Chandra X-ray Telescope. We have applied three mathematical techniques to Chandra ACIS observations of SNR sources: a power-ratio technique to measure morphological asymmetry, correlation-length analysis to probe chemical segregation and distribution, and wavelet-transform analysis (WTA) to quantify X-ray substructure. Detailed comparison between sources provides crucial insights regarding the nature of the explosion, the effects of heating and dense environments, and particle acceleration properties. In this talk, we will discuss specifically the application of our methods to the non-thermal X-ray and radio continuum in SNRs thought to arise from synchrotron cooling of electrons accelerated at the supernova shocks. For each remnant, we have created individual X-ray images of observed spectral features (emission lines, thermal and non-thermal emission). Using correlation-length analysis, we disentangle the thermal and non-thermal emitting regions, and we measure with great accuracy the sizes and locations of thermal and non-thermal clumps with wavelet-transform analysis. The non-thermal X-ray continuum is located predominantly around the rim of our sources, and it has great excess power at small scales compared to the thermal component. Additionally, we have applied our methods to high-resolution radio images of our sources to determine how the size of the synchrotron emitting regions changes as a function of energy. In this manner, we attempt to develop a global picture of particle acceleration and the role of the magnetic field in that process.

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