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Far Ultraviolet Observations of the Spica Nebula and the Interaction Zone
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  • Far Ultraviolet Observations of the Spica Nebula and the Interaction Zone
  • Far Ultraviolet Observations of the Spica Nebula and the Interaction Zone
저자명
최연주,박재우,민경욱,선광일,조영수,Choi. Yeon-Ju,Park. Jae-Woo,Lim. Tae-Ho,Min. Kyoung-Wook,Seon. Kwang-Il,Jo. Young-Soo
간행물명
천문학회보
권/호정보
2012년|37권 2호|pp.99-99 (1 pages)
발행정보
한국천문학회
파일정보
정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
서지반출

기타언어초록

We report the results of our analysis of far ultraviolet (FUV) observations made for the broad region around the ${alpha}$ Vir (Spica) including the interaction zone of the Loop I and the Local Bubble. We employed the datasets of the GALEX and the FIMS, which made observations at similar FUV wavelengths. First, we noted that the GALEX image was enhanced in the southern region where the interaction zone exists. We attribute this enhanced FUV emission to dust scattering of the stellar photons, mostly from the background field stars with small contributions from the central star Spica. While the region is optically thin in general, the FUV intensity did not correlate well with the dust extinction level, indicating that the local radiation field has significant fluctuations. On the other hand, the GALEX FUV intensity well with the $H{alpha}$ intensity as well as the dust extinction level in the northern part. In fact, the neutral hydrogen column density correlated very well with the dust extinction level throughout the whole region in consideration. The relationship between the neutral hydrogen column density and the color excess was estimated to be ${sim}7{ imes}10^{21}atoms;cm^{-2}$, which is a little higher than the previous observations made for a diffuse interstellar medium. The spectral analyses of the FIMS observations showed the enhanced C IV emission throughout the whole region, indicating that the C IV emission arises by the interaction of the hot gases with the shell boundaries. A simple model showed that a large portion of the C IV emission comes from the Loop I side of the interaction zone, compared to the Local Bubble side. The FIMS spectrum also showed indications of the molecular hydrogen fluorescence lines for the interaction zone.