The Discovery of Localized Hard X-ray Emission in the Supernova Remnant IC 443
Abstract
We present ASCA GIS data that show a hard X-ray source located at 06(h) 17(m) 05(s) ,{+22deg 21arcmin 30arcsec }(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' 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 +/- 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
- Publication:
-
American Astronomical Society Meeting Abstracts #188
- Pub Date:
- May 1996
- Bibcode:
- 1996AAS...188.7402K