Forbidden coronal iron emission in the Cygnus Loop

Journal Article · Sat Dec 01 04:00:00 EST 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/169478· OSTI ID:5995844

Teske, R G ^[1]

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1. Michigan Univ., Ann Arbor (USA)

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. 20 refs.

• OSTI ID: 5995844
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 365; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
COSMIC RADIATION
COSMIC RADIO SOURCES
ELEMENTS
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
EXPLOSIONS
FORBIDDEN TRANSITIONS
IMAGES
IONIZING RADIATIONS
IRON
MATHEMATICAL MODELS
METALS
PHOTOMETRY
RADIATIONS
SHOCK WAVES
SPECTRA
STAR MODELS
STELLAR ATMOSPHERES
STELLAR CORONAE
SUPERNOVA REMNANTS
TRANSITION ELEMENTS