Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365..256t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 10, 1990, p. 256-260.
Astronomy and Astrophysics
Astrophysics
14
Emission Spectra, Forbidden Transitions, Iron, Stellar Coronas, Supernova Remnants, Astronomical Photometry, Cosmic Rays, Cygnus Constellation, Shock Waves
Scientific paper
Forbidden iron line images of parts of the Cygnus Loop supernova remnant are reported and discussed. Images in both the red and green lines on the rim of NGC 6995 cannot be well interpreted in terms of cloud evaporation, and instead support the reflected shock model of Hester and Cox (1986). On the northeast rim both lines are brightest at the radiative filaments of NGC 6992 and fade to invisibility in the remnant's interior, in agreement with the 'sheet model' for the Cygnus Loop. Forbidden Fe X emission is also found just behind some of the nonradiative filaments lying northeast of the main optical nebulosity, at a location quantitatively consistent with the cosmic-ray shock model of Boulares and Cox (1988). However, the forbidden Fe X and forbidden Fe IV data taken together also qualitatively agree with a hydrodynamic shock and cavity explosion model for the event which created the Cygnus Loop.
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