| タイトル | Ultraviolet Imaging Telescope observations of the Cygnus Loop |
| 著者（英） | Bohlin, Ralph C.; Gull, Theodore R.; O'Connell, Robert W.; Jenkins, Edward B.; Parker, Robert A. R.; Smith, Eric P.; Roberts, Morton S.; Smith, Andrew M.; Cheng, Kwang-Ping; Cornett, Robert H. |
| 著者所属（英） | NASA Headquarters; NASA Goddard Space Flight Center |
| 発行日 | 1992-08-10 |
| 言語 | eng |
| 内容記述 | 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. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 93A12531 |
| 権利 | Copyright |
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