Non-Thermal and Supra-Thermal X-Rays from the Northeast Shell of W28

Details Non-Thermal and Supra-Thermal X-Rays from the Northeast Shell of W28 Non-Thermal and Supra-Thermal X-Rays from the Northeast Shell of W28

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....4.2401u&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

We observed the northeast X-ray shell of an SNR W28 with X M M N ew ton and found two X-ray bright spots; one is interacting with a molecular cloud, and the other is free from the interaction. The X-ray spectra from these regions show emission lines and a hard tail, and are fitted with a model of a thin-thermal plasma (k T ˜ 0.3 keV) plus a power-law function. The abundances are lower than the solar value, which suggests the presence of additional featureless continuum emission, possibly a non-thermal component. We also found that the hard X-rays are extending to the center region of the SNR (the inside region). The X-ray spectrum is different from those of the shell region; it requires three-temp erature (˜ 0.3, ˜ 0.6, and > 4 keV) plasma.

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