Abstract
view Abstract Citations (46) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Optical detection of a fast shock wave associated with the Cygnus Loop Raymond, J. C. ; Davis, M. ; Gull, T. R. ; Parker, R. A. R. Abstract A faint filament which lies 4-6 arcmin outside the bright optical filaments of the NW section of the Cygnus Loop is detected only in hydrogen Balmer emission in the range 4500-6900 A. This unusual nebular spectrum is similar to that of the optical filaments of Tycho's Supernova Remnant. Such a spectrum is interpreted as emission from neutral gas swept up by a fast shock. The discovery of this filament supports the fast shock interpretation of the high-velocity H-alpha observed in the Cygnus Loop and in other old supernova remnants. Implications for models of the Cygnus Loop and the interstellar medium in general are discussed. Publication: The Astrophysical Journal Pub Date: May 1980 DOI: 10.1086/183249 Bibcode: 1980ApJ...238L..21R Keywords: Interstellar Matter; Nebulae; Shock Waves; Supernova Remnants; Visual Observation; Balmer Series; Emission Spectra; H Alpha Line; Hydrogen Atoms; Neutral Gases; Astrophysics full text sources ADS |
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