Ultraviolet Imaging Telescope observations of the Cygnus Loop

Details Ultraviolet Imaging Telescope observations of the Cygnus Loop Ultraviolet Imaging Telescope observations of the Cygnus Loop

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...395l...9c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 395, no. 1, p. L9-L12.

Astronomy and Astrophysics

Astronomy

23

Astronomical Spectroscopy, Image Analysis, Supernova Remnants, Ultraviolet Telescopes, Cygnus Constellation, Emission Spectra, Forbidden Bands, Resonance Lines, Spaceborne Astronomy

Scientific paper

Attention is given to UV images of a 40-arcmin field in the northeast part of the Cygnus Loop made by the Ultraviolet Imaging Telescope (UIT) during the Astro-1 mission in December 1990. The longest FUV (B5) exposure is compared with ground-based and X-ray observations and with models. It is inferred from SNR shock models that C IV 1550 A dominates for more typical conditions in SNRs, and IUE spectra exhibit a strong correlation between C IV 1550-A flux and UIT B5 flux. The B5 image resembles images in forbidden O III 5007 A, but to the east of the edge of the forbidden O III filaments there is a faint C IV emission, consistent with nonradiative shocked material behind the SNR blast wave. Conditions in shocked gases that lead to C IV emission are similar to those that produce forbidden O III. Hence the ratio of the B5 and forbidden O III intensities can be used to map the optical depths of the sheetlike regions that emit the C IV resonance line.

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