An X-ray study of IC443 and the discovery of a new supernova remnant by ROSAT

Details An X-ray study of IC443 and the discovery of a new supernova remnant by ROSAT An X-ray study of IC443 and the discovery of a new supernova remnant by ROSAT

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...284..573a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 284, no. 2, p. 573-582

Astronomy and Astrophysics

Astronomy

58

Shock Waves, Spectrum Analysis, Supernova Remnants, X Ray Astronomy, X Ray Imagery, Brightness Distribution, Molecular Clouds, Morphology, Rosat Mission, Sky Surveys (Astronomy), X Rays

Scientific paper

The supernova remnant IC443 and the surrounding field have been imaged for the first time in X-rays during the ROSAT all-sky survey. Radio and infrared observations had suggested that IC443 consists of three connected, partially incomplete sub-shells. Whereas two of the three sub-shells have been known in X-rays before, the full extent and the structure of the third sub-shell have been uncovered by ROSAT. Unlike in the radio range, the X-ray emission region is not restricted to a small shell fragment but it forms a complete shell, the western section of which overlaps with the other two bright sub-shells of IC443. Both the morphology and the very soft X-ray spectrum suggest that this shell is a separate approximately 105 yr old supernova remnant, which we call G189.6+3.3. The age of IC443, on the other hand, has been estimated to approximately 103 yr. This is supported by the joint analysis of the ROSAT and Ginga energy spectra, which shows that high energy X-rays (greater than 2 keV) are emitted only from the smaller two shells (IC443) but not from the large shell of G189.6+3.3. Spatially resolved spectroscopy of a ROSAT pointed observation of the IC443 field reveals that G189.6+3.3 and IC443 are separated along the line of sight by a well-known CO molecular cloud. Only the IC443 spectrum is affected by low energy X-ray absorption in the molecular cloud. The spectral analysis shows also that the previously known lane-like structure of reduced X-ray surface brightness across IC443 is due to absorption of the background X-rays from IC443 by a dense shell of cold matter associated with G189.6+3.3 in the foreground.

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