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Paper: Detection of Another Molecular Bubble in the Galactic Center
Volume: 528, New Horizons in Galactic Center Astronomy and Beyond
Page: 75
Authors: Tsujimoto, S.; Oka, T.; Takekawa, S.; Yamada, M.; Tokuyama, S.; Iwata, Y.; Roll, J. A.
Abstract: We identified four regions with high CO J=3–2/J=1–0 intensity ratios having extremely broad velocity widths in the central molecular zone (CMZ) of our Galaxy. The l=–1.°2 region is one of those high ratio regions, which has a shell like structure showing expanding motion. We recently mapped this region in CO, 13CO and SiO lines with the Nobeyama Radio Observatory 45 m telescope and James Clerk Maxwell telescope. Five expanding shells whose centers are aligned roughly parallel to the Galactic plane were detected. The total kinetic energy of 1051 erg and the typical expansion time of 105 yr-1 correspond to multiple supernova explosions at a rate of 10–5–10–4 yr. This indicates that the l=–1.°2 region may be another molecular bubble associated with an embedded massive star cluster. The expansion time of the shells increases as the Galactic longitude decreases, suggesting that the massive star cluster is moving from Galactic west to east with respect to the interacting molecular gas. We propose a model wherein the cluster is moving along the innermost x1 orbit and the interacting gas collides with it from the Galactic eastern side.
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