Star cluster formation in Orion A
Artikel i vetenskaplig tidskrift, 2021

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 (CO)-C-13 (1-0) data to compare molecular gas to the properties of young stellar objects from the SDSS III IN-SYNC survey. We show that the increase of v(13CO) - v(YSO) and Sigma scatter of older YSOs can be signals of cloud-cloud collision. SOFIA-upGREAT 158 mu m [C II] archival data toward the northern part of Orion A are also compared to the (CO)-C-13 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, NGC 1999, there is no indication of such a process in causing the birth of new stars. On the other hand, another southern cluster, L 1641 N, 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.

ISM: clouds

stars: formation

ISM: individual objects (Orion A)


Wanggi Lim

NASA Ames Research Center

Fumitaka Nakamura

National Astronomical Observatory of Japan

Benjamin Wu

National Astronomical Observatory of Japan

Thomas G. Bisbas

National Observatory of Athens

Universität zu Köln

Aristotelio Panepistimio Thessalonikis

Jonathan Tan

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

Edward Chambers

NASA Ames Research Center

John Bally

University of Colorado at Boulder

Shuo Kong

University of Arizona

Peregrine McGehee

College of the Canyons

Dariusz C. Lis

California Institute of Technology (Caltech)

Volker Ossenkopf-Okada

Universität zu Köln

Alvaro Sanchez-Monge

Universität zu Köln

Publication of the Astronomical Society of Japan

0004-6264 (ISSN) 2053051x (eISSN)

Vol. 73 S239-S255


Subatomär fysik

Meteorologi och atmosfärforskning

Astronomi, astrofysik och kosmologi



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