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arXiv 1209.4313astro-ph.SR
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高质量年轻星体G353 .273+0.641 II周围的间歇脉泽耀斑:射电和分子喷流的探测

Intermittent maser flare around the high mass young stellar object G353.273+0.641 II: Detection of a radio and molecular jet

Kazuhito Motogi, Kazuo Sorai, Kotaro Niinuma, Koichiro Sugiyama, Mareki Honma, Kenta Fujisawa

摘要:

我们报告的第一次检测到的无线电连续和分子喷流与占主导地位的蓝移脉泽源,G353.273+0.641。射电喷流沿西北-东南方向延伸3000 au。H $_{2}$ O脉泽被发现聚集在双极射电喷流的根部。通过热SiO($\upsilon$ = 0,$J$ = 2-1)发射检测分子喷流。SiO的光谱非常宽(-120 - +87 km s $^{-1}$),并以明显的蓝移为主,类似于脉泽发射。观测到的H $_{2}$ O脉泽和SiO之间的几何结构和显著的光谱相似性强烈地表明存在一个脉泽尺度($\sim$ 340 au)的分子喷流,它被扩展的射电喷流所包围。我们提出了一个“光盘掩蔽”的情况下,作为强大的蓝移优势的起源,光学厚光盘掩盖了紧凑型喷气机的红移波瓣。

英文摘要:

We report the first detection of a radio-continuum and molecular jet associated with a dominant blue-shifted maser source, G353.273+0.641. A radio jet is extended 3000 au along NW-SE direction. H$_{2}$O masers are found to be clustered in the root of a bipolar radio jet. A molecular jet is detected by thermal SiO ($\upsilon$ = 0, $J$ = 2-1) emission. The SiO spectrum is extremely wide (-120 -- +87 km s$^{-1}$) and significantly blue-shift dominated, similar to the maser emission. The observed geometry and remarkable spectral similarity between H$_{2}$O maser and SiO strongly suggests the existence of a maser-scale ($\sim$ 340 au) molecular jet that is enclosed by the extended radio jet. We propose a "disc-masking" scenario as the origin of the strong blue-shift dominance, where an optically thick disc obscures a red-shifted lobe of a compact jet.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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