Forbidden iron emission on the north rim of IC 443

Details Forbidden iron emission on the north rim of IC 443 Forbidden iron emission on the north rim of IC 443

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...383..233t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 383, Dec. 10, 1991, p. 233-242.

Astronomy and Astrophysics

Astrophysics

1

Emission Spectra, Interstellar Matter, Iron, Nebulae, Shock Wave Interaction, Supernova Remnants, Brightness Distribution, Gray Scale, Line Spectra, Paschen Series, X Rays

Scientific paper

The red and green forbidden coronal iron lines, Fe X 6374 A and Fe XIV 5303 A have been detected along an arc on the north rim of the supernova remant IC 443 that positionally corresponds well with the soft X-ray emission there. The data have been carefully corrected for Paschen continuum contamination. Maximum surface brightnesses are 17 percent of sky (the red line) and 6 percent of sky (the green line). A shell-like structure is revealed by the iron line surface brightness, suggesting that in a restricted part of the north rim the shock may be encountering a smooth part of the interstellar medium. The surface brightnesses corrected for extinction imply a shock speed of equal to or less than 400 km/s there.

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