Forbidden coronal iron emission in the Cygnus Loop

Abstract

view Abstract Citations (14) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Forbidden Coronal Iron Emission in the Cygnus Loop Teske, Richard G. Abstract 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. Publication: The Astrophysical Journal Pub Date: December 1990 DOI: 10.1086/169478 Bibcode: 1990ApJ...365..256T Keywords: Emission Spectra; Forbidden Transitions; Iron; Stellar Coronas; Supernova Remnants; Astronomical Photometry; Cosmic Rays; Cygnus Constellation; Shock Waves; Astrophysics; NEBULAE: INDIVIDUAL NAME: CYGNUS LOOP; NEBULAE: SUPERNOVA REMNANTS full text sources ADS | data products SIMBAD (3)