Far-ultraviolet mapping of the Cygnus Loop with the Voyager 2 Ultraviolet Spectrometer

Details Far-ultraviolet mapping of the Cygnus Loop with the Voyager 2 Ultraviolet Spectrometer Far-ultraviolet mapping of the Cygnus Loop with the Voyager 2 Ultraviolet Spectrometer

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...374..202b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 374, June 10, 1991, p. 202-211.

Astronomy and Astrophysics

Astrophysics

34

Far Ultraviolet Radiation, Supernova Remnants, Ultraviolet Spectrometers, Voyager 2 Spacecraft, Astronomical Spectroscopy, Brightness Distribution, Emission Spectra

Scientific paper

FUV maps of the Cygnus Loop made using spectroscopic data from the Voyager 2 Ultraviolet Spectrometer are presented. Emission line features at about 980 and about 1035 A dominate the 500-1700 A spectra of the Cygnus Loop as observed with Voyager. Maps were generated in the light of these two features. The 980 and 1035 A maps are compared with X-ray and optical images of the Cygnus Loop that have been sampled in the same manner. From this comparison it is clear that the 980 A feature arises mainly from regions of bright optical emission, whereas the 1035 A emission more closely resembles the X-ray emission. This general impression can be confirmed by inspection of the spectra as a function of position. Spectra extracted from positions corresponding to the primary shock front show the 1035 A feature to be relatively strong, while the 980 A feature is brighter when substantial optical emission is present within the aperture.

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