![[Top left] Density distribution of molecular gas in Sgr-B molecular complex after applying the FOT projected on the sky ($(X,Z)$ plane) mimicking the moment 0 map. Scale is in pc. [Top right] Same, but projected on the $(Y,Z)$ plane, showing a side view of the complex from the east, where Y is increasing toward the Sun. Note the bow shape about the Galactic plane. [Bottom left] Same, but projected on the Galactic plane ($(X,Y)$ plane). Magenta dots represent a ring in the galactic plane of radius 120 pc approximately representing the GC Arm I. Thus obtained 3D gas distribution composes a molecular-bow structure sheathing the Sgr-B2 SF region, making a giant cometary H ii region (GCH) open toward the Sun. [Bottom right] Same, but on wider $XY$ area including the CMZ. Sgr A$^{*}$ is at the centre, $(X,Y)=(0,0)$, and the magenta circle is the 120 pc ring with GC Arm I and II (Sofue 1995). The Sun is to positive Y (downward) The outskirts of Sgr-B complex is extended for $\sim 100$ pc in the line-of-sight direction.](https://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/mnras/532/4/10.1093_mnras_stae1724/1/stae1724fig6.jpeg?Expires=1748900373&Signature=v~WnLtHqYpxJG3UwLTEOop00kWT53P69GS~4Ld3b5MEOks9XDXbO11SqPig7E807DhiOKnKhhV4pzztdEH7DiI0K3MWrOyNbq1Zvs5lWDhmtOY08cjdOLL0IJ6YhGPoPPSs1sO95xoG3E9d8kquaucwMWLCCzdDQlfF3GKInpUESLQPhwarrIhGY0hL6tpw7XdCOYHjAqE--oqtkWybZ0ncFJxZBW7YSbSLBt4oDtpF31TKtBVnYH3hs0yTWs6hIjE6uaKnkffHuYDhdCNWzjU5g7o4BCKqP82mFxrkKOz4jNx6435wOGSaYwQdtcZ0uakrWQsp2D-83VvRLqsgyyg__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
[Top left] Density distribution of molecular gas in Sgr-B molecular complex after applying the FOT projected on the sky (|$(X,Z)$| plane) mimicking the moment 0 map. Scale is in pc. [Top right] Same, but projected on the |$(Y,Z)$| plane, showing a side view of the complex from the east, where Y is increasing toward the Sun. Note the bow shape about the Galactic plane. [Bottom left] Same, but projected on the Galactic plane (|$(X,Y)$| plane). Magenta dots represent a ring in the galactic plane of radius 120 pc approximately representing the GC Arm I. Thus obtained 3D gas distribution composes a molecular-bow structure sheathing the Sgr-B2 SF region, making a giant cometary H ii region (GCH) open toward the Sun. [Bottom right] Same, but on wider |$XY$| area including the CMZ. Sgr A|$^{*}$| is at the centre, |$(X,Y)=(0,0)$|, and the magenta circle is the 120 pc ring with GC Arm I and II (Sofue 1995). The Sun is to positive Y (downward) The outskirts of Sgr-B complex is extended for |$\sim 100$| pc in the line-of-sight direction.
