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arXiv 2009.00677astro-ph.GA
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局部气泡中温热气体界面的研究

In Search of an Interface between Warm and Hot Gas within the Local Bubble

Edward B. Jenkins, Cécile Gry

摘要:

我们检查了哈勃太空望远镜上的太空望远镜成像光谱仪(STIS)记录的三颗恒星HD 32309、41 Ari和$η$ ~Tel的紫外光谱,这些恒星位于局部热泡的边界内。在我们寻找Si IV、C IV、和N V,可以揭示存在于本地温暖的($T\sim 7000$ K)中性介质和更遥远的热($T\sim 10^6$ K)星际介质之间的界面。在所有情况下,我们都没有检测到这样的离子。我们最有意义的上限是log N(C IV)< 11.86,朝向HD 32309,这低于穿透传导/蒸发界面或湍流混合层的视线的预期。我们提供了这些负面结果的原因,无论是抑制的导电层所造成的屏蔽的本地云由其他云,这可能会使我们更难以感测离散的吸收功能,从气体在中间温度,或由切向磁场的存在下,在大多数地方的本地云的表面上。

英文摘要:

We have examined UV spectra recorded by the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope for three stars, HD32309, 41 Ari, and $η$~Tel, that are located well inside the boundary of the Local Hot Bubble in our search for absorption features of Si IV, C IV, and N V that could reveal the presence of an interface between the local warm ($T\sim 7000$ K) neutral medium and a more distant hot ($T\sim 10^6$ K) interstellar medium. In all cases, we failed to detect such ions. Our most meaningful upper limit is that for log N(C IV)< 11.86 toward HD32309, which is below the expectation for a sight line that penetrates either a conductive/evaporative interface or a turbulent mixing layer. We offer conjectures on the reasons for these negative results in terms of either a suppression of a conductive layer caused by the shielding of the local cloud by other clouds, which may make it more difficult for us to sense discrete absorption features from gases at intermediate temperatures, or by the presence of a tangential magnetic field at most locations on the surface of the local cloud.

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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