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arXiv 2006.01281astro-ph.GA
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定义Milky Way螺旋臂宽度的多示踪剂新方法

A New Multi-Tracer Approach to Defining the Spiral arm width in the Milky Way

Jacques P Vallée

摘要:

我们分析了最近观测到的银河系中的旋臂宽度,作为银河系半径的函数,我们比较这种关系与密度波理论的预测。我们使用以下方法:在每一个旋臂中,我们集中研究密度波激波前沿附近的恒星形成区(射电脉泽)和密度波势能最小值附近的老化恒星区(弥散的CO气体)之间的间隔(或偏移);我们将这两个示踪物之间的间隔作为旋臂的宽度。新成果:我们发现在250 +/- 50 pc附近有一个典型的分离(脉泽扩散CO气体),并且这种分离随着星系半径的增加而增加,大约为25 +/- 5 pc/kpc。我们注意到,正如预期的那样,这种分离比早期发现的尘埃带和老年恒星区域之间的分离要小一些。总的来说,这些结果支持密度波的基本原理。

英文摘要:

We analyze recent observations of the spiral arm width in the Milky Way, as a function of the galactic radius, and we compare this relation with the prediction from the density wave theory. We use the following method: in each spiral arm, we concentrate on the separation (or offset) between the starforming region (radio masers) near the shock front of a density wave, and the aged star region (diffuse CO gas) near the potential minimum of a density wave; we take this separation between these two tracers as the arm width. New results: we find a typical separation (maser to diffuse CO gas) near 250 +/- 50 pc, and an increase of this separation with galactic radius of about 25 +/- 5 pc per kpc. We note that, as expected, this separation is somewhat smaller than that found earlier between the dust lane and the aged star region. Overall, these results supports the basics of a density wave.

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