We present a survey of 56 massive star-forming regions in the 44 GHz methanol maser transition made with the Karl G. Jansky Very Large Array ( VLA ) ; 24 of the 56 fields showed maser emission .
The data allow us to demonstrate associations , at arcsecond precision , of the Class I maser emission with outflows , HII regions , and shocks traced by 4.5 micron emission .
We find a total of 83 maser components with linewidths ranging from 0.17 to 3.3 km s ^ { -1 } with a nearly flat distribution and a median value of 1.1 km s ^ { -1 } .
The relative velocities of the masers with respect to the systemic velocity of the host clouds range from - 2.5 to 3.1 km s ^ { -1 } with a distribution peaking near zero .
We also study the correlation between the masers and the so-called extended green objects ( EGOs ) from the GLIMPSE survey .
Multiple sources in each field are revealed from IR images as well as from centimeter continuum emission from VLA archival data ; in the majority of cases the 44 GHz masers are positionally correlated with EGOs which seem to trace the younger sources in the fields .
We report a possible instance of a 44 GHz maser associated with a low-mass protostar .
If confirmed , this region will be the fifth known star-forming region that hosts Class I masers associated with low-mass protostars .
We discuss three plausible cases of maser variability .