论文标题
CO排放描绘了银河系核风腔与气态磁盘之间的界面
CO Emission Delineating the Interface between the Milky Way Nuclear Wind Cavity and the Gaseous Disk
论文作者
论文摘要
根据MWISP调查，我们研究了向切线的高Z CO发射，其中分子云（MC）的距离得到很好的确定。在L = 12-26度和| B | <5.1度的区域中，确定了321个MC，| Z |> 110 pc，其中近30个极端高Z MC（| Z |> 260 pc的EHMC）集中在R_GC = 2.6-3.1 kpc的狭窄区域中。 EHMC浓度与R_GC = 2.3-2.6 kpc处的其他高Z MC一起构成了与费米气泡物理相关的HI空隙边缘周围的分子火山墙结构。有趣的是，一些位于银河平面上方和下方的火山口壁上的大型高Z MC显示出彗星结构，头部朝向平面，有利于从平面从平面到高Z区域的多相流动的情况。我们建议银河系对银河气体磁盘产生重大影响。在〜3-6 Myr前，强大的核风风可能是造成观察特征的原因，（1）在Hi voids边缘的增强的CO气体，（2）R_GC <3 kpc内的原子和分子气的缺乏，（3）EHMC浓度和3-KPC型量的EHMC浓度之间的连接量与高高的范围（4）量相关。
Based on the MWISP survey, we study high-z CO emission toward the tangent points, in which the distances of the molecular clouds (MCs) are well determined. In the region of l=12-26 deg and |b|<5.1 deg, a total of 321 MCs with |z|> 110 pc are identified, of which nearly 30 extreme high-z MCs (EHMCs at |z|> 260 pc) are concentrated in a narrow region of R_GC=2.6-3.1 kpc. The EHMC concentrations, together with other high-z MCs at R_GC=2.3-2.6 kpc, constitute molecular crater-wall structures surrounding the edges of the HI voids that are physically associated with the Fermi bubbles. Intriguingly, some large high-z MCs, which lie in the crater walls above and below the Galactic plane, show cometary structures with the head toward the plane, favouring the scenario that the entrained molecular gas moves with the multi-phase flows from the plane to the high-z regions. We suggest that the Milky Way nuclear wind has a significant impact on the Galactic gaseous disk. The powerful nuclear wind at ~3-6 Myr ago is likely responsible for the observational features, (1) the enhanced CO gas lying in the edges of the HI voids, (2) the deficiency of atomic and molecular gas within R_GC<3 kpc, (3) the possible connection between the EHMC concentrations and the 3-kpc arm, and (4) the elongated high-z MCs with the tail pointing away from the Galactic plane.
