Astrophysical interpretation of the 1200-7300 A emission line spectrum of a filament in the Cygnus Loop supernova remnant

Details Astrophysical interpretation of the 1200-7300 A emission line spectrum of a filament in the Cygnus Loop supernova remnant Astrophysical interpretation of the 1200-7300 A emission line spectrum of a filament in the Cygnus Loop supernova remnant

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....92...22d&link_type=abstract

Astronomy and Astrophysics, vol. 92, no. 1-2, Dec. 1980, p. 22-25.

Astronomy and Astrophysics

Astronomy

19

Abundance, Emission Spectra, Interstellar Matter, Line Spectra, Supernova Remnants, Iue, Lyman Spectra, Satellite Observation, Shock Wave Propagation, Spaceborne Astronomy

Scientific paper

An IUE spectrum of a filament in the Cygnus Loop supernova remnant obtained with the low resolution, long wavelength camera, has been combined with earlier far UV and optical data to obtain a complete spectral coverage between 1200 and 7350 Å. The observed continuum is fully understood as a combination of free-free emission, recombination and hydrogen two photon emission, reinforced by collisional excitation to the 2S½ level.
The emission lime spectrum is, in general, well interpreted in the framework of a shockwave model of moderate velocity (vs=90 km/s) and depleted abundances.
The unexpected weakness of the C II λ1335 Å line may be due to scattering in the filament seen as an edge on sheet, or, less likely, owing to absorption in the intervening interstellar medium, indicates a column density of interstellar C II of ≃2.5 × 1014 cm-2 toward the remnant.

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