Three isotopologues CO survey of Molecular Clouds in the CMa OB1 complex

• Published in: arXiv.org
• Main Authors: Ze-Hao Lin, Sun, Yan, Xu, Ye, Yang, Ji, Ying-Jie, Li
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 08.01.2021
• Subjects: Algorithms; Astrochemistry; Carbon monoxide; Clumps; Comparative studies; Massive stars; Molecular clouds; Mountains; Outflow; Physical properties; Physics - Astrophysics of Galaxies; Star & galaxy formation; Star formation; Stellar evolution
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2101.02866

Using the Purple Mountain Observatory 13.7-m millimeter telescope at Delingha in China, we have conducted a large-scale simultaneous survey of \(^{12}\)CO, \(^{13}\)CO, and \xxco (\(J\) = 1--0) toward the CMa OB1 complex with a sky coverage of 16.5 deg\(^{\rm 2}\) (\(221^{\circ}.5\leq l\leq227^{\circ}\), \(-2^{\circ}.5\leq b\leq0^{\circ}.5\)). Emission from the CMa OB1 complex is found in the range 7 km s\(^{-1}\ \leq\) V\(_\mathrm{LSR}\ \leq\) 25 km s\(^{-1}\). The large-scale structure, physical properties and chemical abundances of the molecular clouds are presented. A total of 83 C\(^{18}\)O molecular clumps are identified with GaussClumps algorithm within the mapped region. We find that 94% of these C\(^{18}\)O molecular clumps are gravitationally bound. The relationship between their size and mass indicates that none of the C\(^{18}\)O clump has the potential to form high-mass stars. Using semi-automatic IDL algorithm, we newly discover 85 CO outflow candidates in the mapped area, including 23 bipolar outflows candidates. Additionally, a comparative study reveals evidence for significant variety of physical properties, evolutionary stages, and levels of star formation activity in different sub-regions of the CMa OB1 complex.