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Session 74 - Supernova Remnants.
Display session, Thursday, June 13
Great Hall,
We present ASCA GIS data that show a hard X-ray source located at 06^h 17^m 05^s,+22\deg 21\arcmin 30\arcsec (J2000), which is on the southern shell of the supernova remnant IC 443 \@. We also present ROSAT HRI data which show emission of approximately 1\arcmin\ in extent and no strong periodicity from 0.1 to 1000 Hz\@. The ASCA spectrum of this feature can be characterized by a power-law of energy spectral index \alpha = 1.5 \pm 0.3\@. The hard source is coincident with a unique region of flat radio spectral index (\alpha < 0.24). Linking the radio and X-ray spectra yields an upper limit of 10^16 Hz on the break frequency\@.
The source is near a region of known interactions between shocks and molecular clouds. Moreover, the hard source lies on the 99% confidence error circle of the gamma ray source 2EG J0618+2234\@. However, the Digitized Sky Survey and the VLA D Array Sky Survey show no obvious optical nor radio counterparts. From the current data, we conclude that this source is most likely a site of ongoing particle acceleration producing X-ray synchrotron radiation.
http://lheawww.gsfc.nasa.gov/users/jonathan/AAS_188_IC443
