High-mass Outflows Identified from COHRS CO (3-2) Survey

• Published in: The Astrophysical journal 2018-11, Vol.867 (2), p.167
• Main Authors: Li, Qiang, Zhou, Jianjun, Esimbek, Jarken, He, Yuxin, Baan, W. A., Li, Dalei, Wu, Gang, Tang, Xindi, Ji, Weiguang, Zhexeray, Dauren
• Format: Article
• Language: English
• Subjects: Astrophysics; Bolometers; Clumps; Dust; Galaxies; ISM: jets and outflows; ISM: molecules; Massive stars; Outflow; Polls & surveys; Protostars; Star formation; stars: formation; stars: massive
• ISSN: 0004-637X; 1538-4357
• DOI: 10.3847/1538-4357/aae2b8

An unbiased search of molecular outflows within the region of the CO High Resolution survey has identified 157 high-mass outflows from a sample of 770 APEX Telescope Large Area Survey of the Galaxy clumps with a detection rate of 20%. The detection rate of outflows increases for clumps with higher Mclump, Lbol, Lbol/Mclump, N H 2 , and Tdust compared to the clumps with no outflow. The detection rates of the outflow increase from protostellar (8%) to young stellar object clump (17%) to massive star-forming clump (29%). The detection rate 26% for quiescent clump is preliminary, because the sample of quiescent clumps is small. A statistical relation between the outflow and clump masses for our sample is log ( M out M ) = ( − 1.1 0.21 ) + ( 0.9 0.07 ) log ( M clump M ) . The detection rate of outflows and the outflow mass-loss rate show an increase with increasing Mclump, Lbol, N H 2 , and Tdust, which indicates that clumps with outflow with higher parameter values are at a more advanced evolutionary stage. The outflow mechanical force increases with increasing bolometric luminosities. No clear evidence has yet been found that higher-mass outflows have different launching conditions than low-mass outflows.