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ALMA view of G0.253+0.016: Can cloud-cloud collision form the cloud?

We present the results of sulfur monoxide, SO line emission observations of G0.253+0.016 with the Atacama Large Millimeter/submillimeter Array (ALMA) at an angular resolution of 1.7 arcsec. The dense and massive molecular cloud of G0.253+0.016 is highly sub-structured, yet shows no obvious signs of cluster formation. We found three outstanding features of the cloud from the SO emission, namely, shell structure of radius 1.3 pc, large velocity gradients of 20 km/s/pc with the cloud, and cores with large velocity dispersions (30-40 km/s) around the shell structure. We suggest that these large-velocity dispersion cores will form high-mass stars in the future. In attempt to explore the formation scenario of the dense cloud, we compared our results with numerical simulations, thus, we propose that G0.253+0.016 may have formed due to a cloud-cloud collision process.

preprint2014arXivOpen access
Aya E. HiguchiJames O. ChibuezeAsao HabeKen TakahiraShuro Takano
astro-ph.GA
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Aya E. HiguchiJames O. ChibuezeAsao HabeKen TakahiraShuro Takano

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