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Paper: Investigation for Evidence and Impacts of Cloud-Cloud Collisions in the Galactic Center I: Common Foot Point of Molecular Loops 1 and 2
Volume: 528, New Horizons in Galactic Center Astronomy and Beyond
Page: 343
Authors: Enokiya, R.; Torii, K.; Matsunaga, K.; Fukui, Y.
Abstract: Based on recent Galactic plane surveys in CO with a high angular resolution and a large field of view, an increasing number of literatures reports that a formation of high-mass stars are triggered by a cloud-cloud collision (CCC). A goal of this study is to reveal impacts of CCCs with respect to gas dynamics and star formation activities in the Galactic Center (GC). In order to elucidate the properties of CCC in the GC, we first investigated the common foot point of molecular loops 1 and 2. We applied a technic to identify a CCC, and discovered clear signatures of two pairs of CCCs. The collisions occured at a foot point of the loop by a stagnation of the gas flow along the magnetic loop. The elapsed times of the collisions were estimated to be a few × 105 yr. Surprisingly, these collisions are not accompanied by any signatures of star formation.
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