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arXiv · 2004.03668

Star Cluster Formation in Orion A

Wanggi Lim·Fumitaka Nakamura·Benjamin Wu·Thomas G. Bisbas·Jonathan C. Tan·Edward Chambers·John Bally·Shuo Kong·Peregrine McGehee·Dariusz C. Lis·Volker Ossenkopf-Okada·Álvaro Sánchez-Monge
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Abstract

We introduce new analysis methods for studying the star cluster formation processes in Orion A, especially examining the scenario of a cloud-cloud collision. We utilize the CARMA-NRO Orion survey $^{13}$CO (1-0) data to compare molecular gas to the properties of YSOs from the SDSS III IN-SYNC survey. We show that the increase of $v_{\rm 13CO} - v_{\rm YSO}$ and $\Sigma$ scatter of older YSOs can be signals of cloud-cloud collision. SOFIA-upGREAT 158$\mu$m [CII] archival data toward the northern part of Orion A are also compared to the $^{13}$CO data to test whether the position and velocity offsets between the emission from these two transitions resemble those predicted by a cloud-cloud collision model. We find that the northern part of Orion A, including regions ONC-OMC-1, OMC-2, OMC-3 and OMC-4, shows qualitative agreements with the cloud-cloud collision scenario, while in one of the southern regions, NGC1999, there is no indication of such a process in causing the birth of new stars. On the other hand, another southern cluster, L1641N, shows slight tendencies of cloud-cloud collision. Overall, our results support the cloud-cloud collision process as being an important mechanism for star cluster formation in Orion A.

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Wanggi Lim, Fumitaka Nakamura, Benjamin Wu, Thomas G. Bisbas, Jonathan C. Tan, Edward Chambers, John Bally, Shuo Kong, Peregrine McGehee, Dariusz C. Lis, Volker Ossenkopf-Okada, Álvaro Sánchez-Monge. 2020-04-07. Star Cluster Formation in Orion A. https://doi.org/10.1093/pasj/psaa035

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