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A comprehensive study of the X-ray structure and spectrum of IC 443
Petre, R.; Szymkowiak, A. E.; Seward, F. D.; Willingale, R.
AA(NASA, Goddard Space Flight Center, Greenbelt, MD), AB(NASA, Goddard Space Flight Center, Greenbelt, MD), AC(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AD(Leicester, University, England)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 335, Dec. 1, 1988, p. 215-238. (ApJ Homepage)
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NASA/STI Keywords:
Astronomical Spectroscopy, Supernova Remnants, X Ray Sources, H Ii Regions, Molecular Clouds, Spectrophotometry, Stellar Envelopes
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This paper presents the results of a comprehensive study of the X-ray emission from the supernova remnant IC 443, using the solid state spectrometer, IPC, and high-resolution images of the Einstein Observatory, and the medium-energy detector of the HEAO 1 A-2 experiment. A soft X-ray appearance was observed, highly atypical of a supernova remnant in the adiabatic phase, with little correlation between X-ray and optical or radio features. The best-fit models of the low-energy X-ray spectrum of the brightest area of the remnant suggest either that the remnant has not yet attained ionization equilibrium or that the X-rays arise in a multiphase medium. Pronounced soft X-ray spectral differences across the remnant are accounted for by variations in absorption by an intervening molecular cloud. The analysis suggests that, despite the atypical X-ray appearance, the X-ray emission in IC 443 is probably confined to a thin (0.1 pc) shell.

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