13CO (J = 1 -- 0) Survey of Molecular Clouds toward the Monoceros and Canis Major Region

Astronomy and Astrophysics – Astronomy

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Catalog, Ism: Clouds, Ism: Molecules

Scientific paper

rough a large-scale 13CO(J=1-0) survey toward a region in Monoceros and Canis Major, we present following results: (1) We identified in total 115 clouds. (2) GroupI (CMaOB1 and G220.8 - 1.7) may physically connected with GroupII (Mon R2 and NGC2149). (3) 496YSO candidates were chosen from IRAS point source catalog (IPC). (4) The mass spectrum of the Local clouds shows a power-law relation with an index of -1.55 ± 0.09. (5) The number fraction of star-forming clouds increases as the cloud mass increases. Especially, massive clouds of Mcloud≥ 103.5Modot are all star-forming clouds. (6) The line width-cloud radius relation is best fitted as ΔVcomp ∝ rcloud0.47 (correlation coefficient = 0.87). (7) The distribution of (Mvir / Mcloud) shows that star-forming clouds tend to be more virialized than no star-forming clouds. (8) Star formation in GroupI is more active than that in GroupII. (9) Unexpected small number of low-mass clouds in GroupI may be due to strong UV radiation from O-type stars in the vicinity of the clouds. (10) Star formation in GroupII might occurred by self-gravitational, except for the most massive cloud.

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