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2021ApJS..253...15L - Astrophys. J., Suppl. Ser., 253, 15-15 (2021/March-0)

High-sensitivity millimeter imaging of molecular outflows in nine nearby high-mass star-forming regions.

LIU D.-J., XU Y., LI Y.-J., ZHENG S., LU D.-R., HAO C.-J., LIN Z.-H., BIAN S.-B. and LIU L.-M.

Abstract (from CDS):

We present a study of molecular outflows using six molecular lines (including 12CO/13CO/C18O/HCO+ (J = 1-0) and CS/SiO (J = 2-1)) toward nine nearby high-mass star-forming regions with accurate known distances. This work is based on the high-sensitivity observations obtained with the 14 m millimeter telescope of the Purple Mountain Observatory in Delingha. The detection rate of outflows (including 12CO, 13CO, HCO+, and CS) is 100%. However, the emission of SiO was not detected for all sources. The full line widths (ΔV) at 3σ above the baseline of these molecular lines have the relationship ΔV_12CO> ΔV_HCO+ > ΔVCS~ΔV_13CO> ΔV_18CO. 12CO and HCO+ can be used to trace relatively high-velocity outflows, while 13CO and CS can be employed to trace relatively low-velocity outflows. The dynamical timescales of the 13CO and CS outflows are longer than those of the 12CO and HCO+ outflows. The mechanical luminosities, masses, mass-loss rates and forces of all outflows (including 12CO, 13CO, HCO+, and CS) are correlated with the bolometric luminosities of their central IRAS sources.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Jets - Interstellar clouds - Star formation

Simbad objects: 24

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2021.06.14-07:23:42

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