Molecular loops in the Galactic centre; Evidence for magnetic floatation accelerating molecular gas

The new molecular image obtained by NANTEN telescope in the galactic center has revealed the existence of the two loop like structures, loop 1 and loop 2, which have never been seen before toward l = 355 to 358. The velocities of loop 1 and loop 2 are 180 to 90 km s¹ and 90 and 40 km s¹, respectively, and these two loops have strong velocity gradients. The foot points of the loops show a very broad linewidth of ~40 to 80 km s¹ whose large velocity spans are characteristic of the molecular gas near the galactic center. Therefore, we classified the loops as being located in the galactic center and adopt a distance of 8.5 kpc. Then, the projected lengths of loop 1 and loop 2 were estimated as ~500 and ~300 pc, respectively and velocity gradients corresponds to ~80 km s¹ per 250 pc along loop 1 and ~60 km s¹ per 150 pc along loop 2. The heights of these loops are also estimated as ~220 to ~300 pc from the galactic plane, significantly higher than the typical scale height in the nuclear disk. pdfS174392130700289Xa.pdfissue- edsB. G. Elmegreen and J. PaloudisplayTextSymposiumdispartContributed Papers