Highly ionized plasma in the Large Magellanic Cloud: evidence for outflows and a possible galactic wind★-猫眼课题宝

大麦哲伦星云中高度电离的等离子体：流出和可能的银河风的证据★

DOI：

发表时间：

2007

期刊：

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作者：

N. Lehner;J. Howk

通过对远紫外光谱探测器（FUSE）和哈勃空间望远镜/空间望远镜成像光谱仪（HST/STIS）E140 M观测到的大麦哲伦星云（LMC）中4颗热星的星际高电离态C IV、S iIV、N V和O VI光谱的分析，我们发现了大麦哲伦星云中存在一个热的大麦哲伦星云晕的证据。这种外流的特征是相对于在高和低离子吸收剖面中观察到的LMC盘的中高速分量（vLSR 100 km s −1）。恒星环境产生了与大麦哲伦星系盘相关的C IV和Si IV的强而窄（T2 × 10 4 K）的成分;特别是它们可能是H II区和膨胀壳层的特征。广泛的组件中观察到的配置文件的C IV，S iIV和O VI与它们的宽度意味着热，碰撞电离气体的温度的几倍10 - 5 K。大麦哲伦星云和高速成分的O VI/C IV比值有着惊人的相似性，这表明vLSR 100 km s −1处的大部分物质与大麦哲伦星云有关。高速分量的速度大到足以完全逃离大麦哲伦星系，污染大麦哲伦星系和银河系之间的星系际空间。观察到的宽LMC和高速分量的高离子比与导电界面中产生的高离子比一致;这种模型也受到高离子和弱离子之间明显的运动学耦合的支持。

Based on an analysis of the interstellar highly ionized species C IV ,S iIV ,N V and O VI observed in the Far Ultraviolet Spectroscopic Explorer (FUSE) and Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS) E140M spectra of four hot stars in the Large Magellanic Cloud (LMC), we find evidence for a hot LMC halo fed by energetic outflows from the LMC disc and even possibly an LMC galactic wind. Signatures for such outflows are the intermediate- and high-velocity components (vLSR 100 km s −1 ) relative to the LMC disc observed in the high- and low-ion absorption profiles. The stellar environments produce strong, narrow (T 2 × 10 4 K) components of C IV and Si IV associated with the LMC disc; in particular they are likely signatures of H II regions and expanding shells. Broad components are observed in the profiles of C IV ,S iIV and O VI with their widths implying hot, collisionally ionized gas at temperatures of a few times 10 5 K. There is a striking similarity in the O VI/C IV ratios for the broad LMC and high-velocity components, suggesting much of the material at vLSR 100 km s −1 is associated with the LMC. The velocity of the high-velocity component is large enough to escape altogether the LMC, polluting the intergalactic space between the LMC and the Milky Way. The observed high-ion ratios of the broad LMC and high-velocity components are consistent with those produced in conductive interfaces; such models are also favoured by the apparent kinematically coupling between the high and the weakly ionized

SPITZER SURVEY OF THE LARGE MAGELLANIC CLOUD, SURVEYING THE AGENTS OF A GALAXY'S EVOLUTION (SAGE). IV. DUST PROPERTIES IN THE INTERSTELLAR MEDIUM

DOI： 10.1088/0004-6256/136/3/919

发表时间： 2005-06

期刊：

The Astronomical Journal

影响因子： --

作者：

M. Meixner;K. Gordon;R. Indebetouw;J. Hora;B. Whitney;R. Blum;W. Reach;J. Bernard;M. Meade;B. Babler;C. Engelbracht;B. For;K. Misselt;U. Vijh;C. Leitherer;M. Cohen;E. Churchwell;F. Boulanger;J. Frogel;Y. Fukui;J. Gallagher;V. Gorjian;J. Harris;D. Kelly;A. Kawamura;Soyoung Kim;W. Latter;S. Madden;Ciska Markwick-Kemper;A. Mizuno;N. Mizuno;J. Mould;A. Nota;M. Oey;K. Olsen;T. Onishi;R. Paladini;N. Panagia;P. Pérez-González;H. Shibai;Sato Shuji;Linda J. Smith;L. Staveley-Smith;A. Tielens;T. Ueta;S. V. Dyk;K. Volk;M. Werner;D. Zaritsky

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Highly ionized plasma in the Large Magellanic Cloud: evidence for outflows and a possible galactic wind★

大麦哲伦星云中高度电离的等离子体：流出和可能的银河风的证据★

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