猎户座分子云团中弥散电离介质的视向速度及线强度比分布
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1.云南大学物理与天文学院昆明650500;2.云南大学中国西南天文研究所昆明650500)

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云南大学校级大学生科研创新训练项目(201804115)资助


Mapping the Radial Velocities and Line Intensity Ratios of Diffuse Ionized Medium in the Orion Molecular Cloud Complex
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1. School of Physics and Astronomy, Yunnan University, Kunming 650500;2. South-Western Institute for Astronomy Research, Yunnan University, Kunming 650500;

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    摘要:

    恒星形成区是研究恒星形成物理过程最重要的天体物理实验室. 猎户座分子云团是研究各种质量恒星形成和相关年轻恒星性质的一个著名天区. 通过对恒星形成区的光学光谱分析, 可以获取其内部热电离气体的运动学和化学性质. 基于国家大科学装置郭守敬望远镜(LAMOST)的光谱观测数据, 从LAMOST I期光谱巡天数据中筛选出8个指向猎户座分子云团的观测面板, 获取了1300多条针对猎户座分子云团内弥散电离介质的有效光谱. 选取不受星际介质污染的背景天光光谱构建超级天光, 对这些光谱数据做减天光处理, 并进一步测量其发射线性质,包括Ha、N Ⅱ] λ 6584、[S Ⅱ]λλ 6717和6731等发射线的中心波长和积分流量等.最后给出猎户座分子云团内弥散电离介质的视向速度和线强度比分布情况.

    Abstract:

    Star formation region is the best astrophysical laboratory for the studies of the physical processes in the formation of stars. The Orion Molecular Cloud Complex is one of the most famous regions to study the formation of stars with different masses, and to reveal the properties of the corresponding young stars. The kinematic and chemical properties of the warm ionized gas of the star forming regions can be obtained by the analysis of their optical spectra. Using the spectroscopic data from the Chinese large astronomical facility Guoshoujing Telescope (also called LAMOST), we have selected eight plates which target the Orion Molecular Cloud Complex. 1,300 spectra from these plates are overlapping with the diffuse ionized gas of the Orion Molecular Cloud Complex. We re-constructed the super-sky spectra with the spectra from the uncontaminated sky fibers for the following sky subtraction. The central wavelength and integrated flux of several emission lines, such as the Ha, [N Ⅱ]λ 6584, [S Ⅱ]λλ 6717 and 6731, are then calculated. Finally we present maps of radial velocities and line intensity ratios covering the diffuse ionized medium in the Orion Molecular Cloud Complex.

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吴金泰,蒋思艺,雷磊,陈丙秋.猎户座分子云团中弥散电离介质的视向速度及线强度比分布[J].天文学报,2020,(6):103-115.

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  • 收稿日期:2020-04-29
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  • 在线发布日期: 2020-12-04
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