Star Cluster Formation in Orion A

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 $v_{13CO}-v_{\mathrm{YSO}}$ 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.

16 pages, 11 figures, 4 tables, published in PASJ

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Cited by in corpus (10)

• Cloud-cloud collisions and triggered star formation
• 3D dynamics of the Orion cloud complex -- Discovery of coherent radial gas motions at the 100-pc scale
• Photodissociation Region Diagnostics Across Galactic Environments
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• Massive young stellar objects in the Local Group spiral galaxy M33 identified using machine learning
• Surveying the Giant HII Regions of the Milky Way with SOFIA: III. W49A
• The C${}^{18}$O core mass function toward Orion A: Single-dish observations