Three-Dimensional Structure of the Central Molecular Zone. (arXiv:2208.02451v2 [astro-ph.GA] UPDATED)

Three-Dimensional Structure of the Central Molecular Zone. (arXiv:2208.02451v2 [astro-ph.GA] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Sofue_Y/0/1/0/all/0/1">Yoshiaki Sofue</a>

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 ($lsim -1^circ.2)$, 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.

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 ($lsim -1^circ.2)$, 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.

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