HEAD 2003 Meeting
Session 10. Supernova Remnants III
Poster, Sunday-Wednesday, March 23, 2003, Duration of Meeting

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[10.01] A Nonthermal X-ray Supernova Remnant Toward the Galactic Center

F. Yusef-Zadeh (Northwestern U.), F.K. Baganoff, M.P. Muno (MIT), W. Cotton (NRAO), G.P. Garmire, S. Park (Penn State), M. Morris (UCLA), M. Wardle (Macquarie U.)

Recent Chandra and XMM-Newton observations reported evidence of a nonthermal X-ray filament in the Galactic center (Sakano et al. 2003, MNRAS, astro-ph 0211572). This X-ray source XMM J174540--2904.5 has a hard spectrum with an extent of 15'' and coincides with a wisp-like nonthermal radio source called E (Ho et al. 1985, ApJ, 288, 275). Here, we present more sensitive VLA and Chandra observations of XMM J174540--2904.5 and report detection of an additional wisp (F) of nonthermal X-ray emission. We show that sources E and F, each with an X-ray photon index of 1.2, coincide with the brightest portion of shell-like radio features. Ho et al. (1985) had suggested that these wisps are associated with a supernova remnant and here we confirm their interpretation. Measurement of the X-ray absorption places the shell-type SNR G359.6-0.5 at the distance of the Galactic center or beyond with NH ~1.7 1023 per square cm. The coincidence of the linearly polarized emission at 2cm with nonthermal X-ray emission is compelling evidence for the acceleration of particles to TeV energies, as has been seen in SN 1006 and G347.3-0.5.

This research was supported by NASA grant NAS8-39073.

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Bulletin of the American Astronomical Society, 35#2
© 2003. The American Astronomical Soceity.