arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1409.4801astro-ph.GA
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观测到的Milky Way星系旋臂切线星表

Catalog of observed tangents to the spiral arms in the Milky Way galaxy

Jacques P Vallee

摘要:

从太阳在银河系盘中的位置,人们可以使用不同的臂示踪剂(CO,HII,热或电离或相对论电子,脉泽,冷或热尘埃等)来定位银河系盘中每个螺旋臂的切线。我们提出了一个主目录的天文观测切线星系的旋臂,使用不同的臂示踪剂从文献中。有些旋臂示踪器在几篇论文中的结果可能略有不同,所以取一个平均值--关于CO、HII和脉泽,见附录。平均值主目录目前包括63个平均示踪条目,分布在许多臂(船底座,十字座-半人马座,诺玛,英仙座起源,近3-kpc,盾牌座,人马座),源于107个原始臂示踪条目。此外,我们更新并修订了之前的统计分析,即每种不同平均臂示踪剂的角度偏移和与中臂的线性分离。如果有足够多的旋臂示踪物,并对所有旋臂进行求和和平均,人们就可以确定在银河系中旋臂示踪物是否有单独和平行的通道。这种统计分析允许一个银河螺旋臂的横切,证实了最近发现的臂示踪剂之间的线性分离。在这里,从中臂的CO到内缘的热尘埃,臂的半宽度约为340秒差距;加倍将产生680秒差距的全臂宽度。我们简要地比较了这些观察与许多螺旋臂理论,特别是密度波理论的预测。

英文摘要:

From the sun's location in the Galactic disk, one can use different arm tracers (CO, HII, thermal or ionized or relativistic electrons, masers, cold or hot dust, etc) to locate a tangent to each spiral arm in the disk of the Milky Way galaxy. We present a Master catalog of the astronomically observed tangents to the Galaxy's spiral arms, using different arm tracers from the literature. Some arm tracers can have slightly divergent results from several papers, so a mean is taken - see Appendix for CO, HII, and masers. The Master catalog of means currently consists of 63 mean tracer entries, spread over many arms (Carina, Crux-Centaurus, Norma, Perseus origin, near 3-kpc, Scutum, Sagittarius), stemming from 107 original arm tracer entries. Additionally, we updated and revised a previous a previous statistical analysis of the angular offset and linear separation from the mid-arm, for each different mean arm tracer. Given enough arm tracers, and summing and averaging over all spiral arms, one could determine if arm tracers have separate and parallel lanes in the Milky Way. This statistical analysis allows a cross-cut of a galactic spiral arm to be made, confirming a recent discovery of a linear separation between arm tracers. Here, from the mid-arm's CO to the inner edge's hot dust, the arm half-width is about 340 parsecs; doubling would yield a full arm width of 680 parsecs. We briefly compare these observations with the predictions of many spiral arm theories, notably the density wave theory.

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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