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Title:
1420 and 408 MHz Continuum Observations of the IC 443/G189.6+3.3 Region
Authors:
Leahy, D. A.
Affiliation:
AA(Department of Physics and Astromy, University of Calgary, 2500 University Drive, NW, Calgary, AB T2N 1N4, Canada; )
Publication:
The Astronomical Journal, Volume 127, Issue 4, pp. 2277-2283. (AJ Homepage)
Publication Date:
04/2004
Origin:
UCP
AJ Keywords:
ISM: Supernova Remnants
DOI:
10.1086/382241
Bibliographic Code:
2004AJ....127.2277L

Abstract

Observations at 1420 and 408 MHz were made with the Dominion Radio Astrophysical Observatory Synthesis Telescope of the region including IC 443 and G189.6+3.3. A spectral index map is computed: the bright northeast part of IC 443 has 408-1420 MHz spectral index α=0.43+/-0.02, the southwest part has α=0.2-0.6, and G189.6+3.3 has α=0.1-0.7. The radio images are compared with optical, infrared, molecular line, and X-ray images. The appearance of IC 443 as two half-shells is due to the ring of shocked molecular gas that sits at the join of the half-shells. G189.6+3.3 has nonthermal radio emission and is confirmed as a separate supernova remnant. The pulsar wind nebula found by Chandra likely originates in G189.6+3.3 rather than in IC 443.

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