arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2208.02451astro-ph.GA
收藏

中心分子带的三维结构

Three-Dimensional Structure of the Central Molecular Zone

Yoshiaki Sofue

摘要:

详细的比较HI和CO线立方体数据的银河系中心(GC)地区的档案。中心分子带(CMZ)被显示为嵌入在半径为$\sim 320$ pc和垂直刻度高度为$\sim 70$ pc的HI盘(中心HI带,CHZ)中。射电连续谱带平行于分子臂I和臂II。这条带在天空中画出一个双无限的形状,连接着Sgr E($l\sim -1^\circ.2)$)、C、B1、B2和Sgr D($+1^\circ.2$),被解释为一个翘曲的恒星形成环。分子臂在等速图(LVD)上与HI臂密切相关,显示出一致的刚体脊。由于HI和CO之间的密切关系,HI谱线吸收可以用来确定Arms相对于Sgr A、B1、B2和C的位置。结合Sgr A $^*$自行和Sgr B2脉泽源的三角资料以及径向速度,确定了Sgr B2的三维速度矢量。从这些分析中,显示具有Sgr B2的分子臂I位于Sgr A $^*$的近侧,而具有Sgr C的臂II位于另一侧,两者构成围绕GC的一对对称臂。我们提出了一个可能的三维视图Sgr A通过E和武器I和II以及参数列表。

英文摘要:

A detailed comparison of HI and CO line cube data of the Galactic Center (GC) region from the archives is obtained. The central molecular zone (CMZ) is shown to be embedded in the HI disc (central HI zone, CHZ) of radius $\sim 320$ pc and vertical scale height $\sim 70$ pc. A radio continuum belt is shown to run parallel to molecular Arms I and II. The belt draws a double-infinity shape on the sky, connecting Sgr E ($l\sim -1^\circ.2)$, C, B1, B2 and Sgr D ($+1^\circ.2$), and is interpreted as a warping star-forming ring. The molecular Arms are closely associated with the HI arms on the longitude-velocity diagram (LVD), showing coherent rigid-body ridges. Due to the close relationship between HI and CO, the HI line absorption can be used to determine the Arms' position relative to Sgr A, B1, B2 and C.Combining the trigonometric data of proper motions of Sgr A$^*$ and maser sources of Sgr B2 as well as radial velocities, the 3D velocity vector of Sgr B2 is determined. From these analyses, the molecular Arm I with Sgr B2 is shown to be located in the near side of Sgr A$^*$, and Arm II with Sgr C in the other side, both composing a pair of symmetrical Arms around the GC. We present a possible 3D view of Sgr A through E and Arms I and II along with a parameter list.

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。

↑