2021ApJS..252...20L

Using the Purple Mountain Observatory 13.7 m millimeter telescope at Delingha in China, we have conducted a large-scale simultaneous survey of ¹²CO, ¹³CO, and C¹⁸O (J = 1-0) toward the CMa OB1 complex with a sky coverage of 16.5 deg² (221.5° <= l <= 227°, -2.5° <= b <= 0.5°). Emission from the CMa OB1 complex is found in the range 7 km s^–1 <= V_LSR <= 25 km s^–1. The large-scale structure, physical properties, and chemical abundances of the molecular clouds are presented. A total of 83 C¹⁸O molecular clumps are identified with the GaussClumps algorithm within the mapped region. We find that 94% of these C¹⁸O molecular clumps are gravitationally bound. The relationship between their size and mass indicates that none of the C¹⁸O clumps has the potential to form high-mass stars. Using a semiautomatic IDL algorithm, we newly discover 85 CO outflow candidates in the mapped area, including 23 bipolar outflow candidates. Additionally, a comparative study reveals evidence for a significant variety of physical properties, evolutionary stages, and levels of star formation activity in different subregions of the CMa OB1 complex.