Optical detection of a fast shock wave associated with the Cygnus Loop

Details Optical detection of a fast shock wave associated with the Cygnus Loop Optical detection of a fast shock wave associated with the Cygnus Loop

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238l..21r&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 238, May 15, 1980, p. L21-L25.

Other

36

Interstellar Matter, Nebulae, Shock Waves, Supernova Remnants, Visual Observation, Balmer Series, Emission Spectra, H Alpha Line, Hydrogen Atoms, Neutral Gases

Scientific paper

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.

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