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

Abstract

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${}^2$ ($221^{\circ }.5\le l\le 227^{\circ }$, $-2^{\circ }.5\le b\le 0^{\circ }.5$). Emission from the CMa OB1 complex is found in the range 7 km s${}^{-1}\le$ V${}_{\mathrm{LSR}}\le$ 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.

arXiv comment31 pages, 20 figures, 10 tables, accepted for publication in ApJS

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