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We present a study of molecular outflows using six molecular lines (including12CO/13CO/C18O/HCO+(J = 1-0) and SiO/CS(J = 2-1)) toward nine nearby high-massstar-forming regions with accurate known distances. This work is based on thehigh-sensitivity observations obtained with the 14-m millimeter telescope ofPurple Mountain Observatory Delingha (PMODLH) observatory. The detection rateof outflows (including 12CO, 13CO, HCO+, and CS) is 100\%. However, theemission of SiO was not detected for all sources. The full line widths ($\DeltaV$) at 3$\sigma$ above the baseline of these molecular lines have therelationship $\Delta V_{\rm ^{12}CO} > \Delta V_{\rm HCO^{+}} > \Delta V_{\rmCS} \approx \Delta V_{\rm ^{13}CO} > \Delta V_{\rm ^{18}CO}$. 12CO and HCO+ canbe used to trace relatively high-velocity outflows, while 13CO and CS can beemployed to trace relatively low-velocity outflows. The dynamical timescales ofthe 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 bolometricluminosities of their central IRAS sources.

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