Star cluster formation in Orion A
Journal article, 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)
Author
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
University of Cologne
Aristotle University of Thessaloniki
Jonathan Tan
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
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
University of Cologne
Alvaro Sanchez-Monge
University of Cologne
Publication of the Astronomical Society of Japan
0004-6264 (ISSN) 2053051x (eISSN)
Vol. 73 S239-S255Subject Categories
Subatomic Physics
Meteorology and Atmospheric Sciences
Astronomy, Astrophysics and Cosmology
DOI
10.1093/pasj/psaa035