The Discovery of Localized Hard X-ray Emission in the Supernova Remnant IC 443

Details The Discovery of Localized Hard X-ray Emission in the Supernova Remnant IC 443 The Discovery of Localized Hard X-ray Emission in the Supernova Remnant IC 443

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.7402k&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #74.02; Bulletin of the American Astronomical Society, Vol. 28, p.947

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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

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