Far Ultraviolet Observations of the Spica and the $\zeta$-Ophiuchi Nebulae = Spica 와 $\zeta$-Ophiuchi nebula 지역에서의 원자외선 연구

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Interstellar medium (ISM) is one of the important components of the universe, because it is part of the recycling process in the Galactic evolution. A wealth of information regarding the physical and chemical states of (ISM) can be obtained through the observations in the far-ultraviolet (FUV) wavelengths (900-1750 Å). FUV observations are also useful in the study of H II regions around bright stars, with emission lines in the spectral range associated with highly ionized gas. In this thesis, studies are focused on the two H II regions, the Spica and the $\zeta$-Ophiuchi nebulae, which are located in the northern Galactic latitudes, based on the observations made by the FUV Imaging Spectrograph (FIMS). The first FUV spectral images of these two prominent H II regions are ever made in this study, which show notable features of the H II regions as well as their interactions with the surrounding media. The FUV images are compared with those observed in other wavelengths, including the radio and the infrared maps. Based on these multi-wavelength observations and through numerical simulations, physical properties of the H II regions and nearby regions are obtained. The Spica ($\alpha$ Vir) is a spectroscopic binary system and is at a distance of ∼80 pc from the Sun. A broad region around $\alpha$ Vir (Spica) is studied in this work including the interaction zone of Loop I and the Local Bubble. The whole region is optically thin and a general correlation is seen between the FUV continuum intensity and the dust extinction, except in the neighborhood of the bright central star, indicating the dust scattering nature of the FUV continuum. Monte Carlo radiative transfer simulation is performed to obtain the optical parameters related to the dust scattering as well as the geometrical structure of the dust clouds. The diffuse FUV continuum in the northern regions above Spica is found to be mostly the result of scattering of the starlight from Spica, while that in the sou...
Min, Kyoung-Wookresearcher민경욱
한국과학기술원 : 물리학과,
Issue Date
591753/325007  / 020107147

학위논문(박사) - 한국과학기술원 : 물리학과, 2014.8, [ viii,113 ]


ζ-Ophiuchi; Spica; 먼지 산란; 원자외선; H II 지역; ζ-Ophiuchi; H II region; Far-Ultraviolet; Dust scattering; Spica

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