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Paper: A New Look at the High-velocity Compact Cloud CO 0.02–0.02
Volume: 528, New Horizons in Galactic Center Astronomy and Beyond
Page: 109
Authors: Iwata, Y.; Oka, T.; 1; Takekawa, 2. S.; Nakagawara, R.; Tsujimoto, S.; Roll, J. A.
Abstract: High-velocity compact cloud (HVCC) is a peculiar population of molecular cloud found in the central molecular zone (CMZ) of our Galaxy. They are characterized by their compact sizes and large velocity widths, while their driving sources are still unidentified. CO 0.02–0.02 is one of the most energetic HVCCs located at 5′ Galactic east of Sgr A*. The association of an arc-shaped cavity which encloses a group of point-like IR sources may suggest that CO 0.02–0.02 has been accelerated by a series of supernova explosions. Here, we report the results of submillimeter molecular line mapping observations. The obtained maps show that the highest-velocity gas in CO 0.02–0.02 significantly deviates from the cavity and its kinematics can not be reproduced by the single expanding-shell model. We examined the possible origins of (1) multiple expanding shells, (2) orbital motions around a compact mass, (3) outflows from protostars, and (4) cloud-cloud collisions. We will be able to distinguish the origin of CO 0.02–0.02 by future high-resolution mapping observations with ALMA.
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