view Abstract Citations (28) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Ultraviolet Imaging Telescope Observations of the Cygnus Loop Cornett, Robert H. ; Jenkins, Edward B. ; Bohlin, Ralph C. ; Cheng, Kwang-Ping ; Gull, Theodore R. ; O'Connell, Robert W. ; Parker, Robert A. R. ; Roberts, Morton S. ; Smith, Andrew M. ; Smith, Eric P. ; Stecher, Theodore P. Abstract 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. Publication: The Astrophysical Journal Pub Date: August 1992 DOI: 10.1086/186476 Bibcode: 1992ApJ...395L...9C Keywords: Astronomical Spectroscopy; Image Analysis; Supernova Remnants; Ultraviolet Telescopes; Cygnus Constellation; Emission Spectra; Forbidden Bands; Resonance Lines; Spaceborne Astronomy; Astrophysics; ISM: SUPERNOVA REMNANTS; ULTRAVIOLET: GENERAL full text sources ADS | data products MAST (2) SIMBAD (1)