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Title:
The nature of the filaments northeast of the supernova remnant IC 443
Authors:
Fesen, R. A.
Affiliation:
AA(NASA, Goddard Space Flight Center, Laboratory for Astronomy and Solar Physics, Greenbelt, MD)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 281, June 15, 1984, p. 658-664. (ApJ Homepage)
Publication Date:
06/1984
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL SPECTROSCOPY, FILAMENTS, NEBULAE, SUPERNOVA REMNANTS, EMISSION SPECTRA, H II REGIONS, LINE SPECTRA, OPTICAL MEASUREMENT, SHOCK WAVE PROPAGATION, SPECTROPHOTOMETRY
DOI:
10.1086/162142
Bibliographic Code:
1984ApJ...281..658F

Abstract

New optical spectrophotometry of the faint filaments northeast of the bright supernova remnant IC 443 show emission-line ratios very similar to those seen in the bright filaments of IC 443 and other supernova remnants. This suggests that these northeastern filaments also represent shock-heated interstellar gas and are not simply the southern boundary of the neighboring H II region S249 as previously suspected. If these filaments are associated with IC 443, they then reveal a much more extended remnant structure than previously assumed and permit a relatively accurate determination of IC 443's distance via its interaction with S249.

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