The researchers  in the SHAO and the PMO have observed a sample of 288 molecular outflow  sources to search for class I methanol masers at 95.1GHz with the PMO  13.7m radio telescope. Our survey detected 68 class I methanol masers,  which include 19 newly detected class I methanol masers (13 high-mass  and 6 low-mass sources). The importance is that the detection of the  newly 6 low-mass sources increase the sample numbers of the low-mass  class I methanol masers. Statistical analysis for the distributions of  maser detections with outflow parameters reveals that the maser  detection efficiency increases with outflow properties. Systematic  investigations of relationships between the intrinsic luminosity of  methanol maser and the outflow properties (including mass, momentum,  kinetic energy, bolometric luminosity and mass loss rate of central  stellar sources) indicate a positive correlations. The paper will be  presented at ApJ (http://arxiv.org/abs/1211.2411).

Figure 1: The log–log distributions between class I methanol  maser luminosity and outflow properties including bolometric luminosity  of central sources (a), outflow mass (b), momen- tum of outflows (c),  and kinetic energy of outflows (d). The green squares and red triangles  represent high-mass and low-mass sources, respetively. The solid black  line is the best linear fit of the plot .