Ammonia and CO Outflow around 6.7 GHz Methanol Masers
  Single point observations are presented in NH3 (1,1) and (2,2) inversion
transitions using the Effelsberg 100 m telescope for a sample of 100 6.7 GHz
methanol masers and mapping observations in the 12CO and 13CO (1-0) transitions
using the PMO Delingha 13.7 m telescope for 82 sample sources with detected
ammonia. A further 62 sources were selected for either 12CO or 13CO line
outflow identification, producing 45 outflow candidates, 29 using 12CO and 16
using 13CO data. Twenty-two of the outflow candidates were newly identified,
and 23 had trigonometric parallax distances. Physical properties were derived
from ammonia lines and CO outflow parameters calculated. Histograms and
statistical correlations for ammonia, CO outflow parameters, and 6.7 GHz
methanol maser luminosities are also presented. No significant correlation was
found between ammonia and maser luminosity. However, weak correlations were
found between outflow properties and maser luminosities, which may indicate
that outflows are physically associated with 6.7 GHz masers.
