We present the results of a high sensitivity survey for 6.7 GHz methanol masers towards 22 GHz water maser using the 100 m Efflesberg telescope. A total of 89 sources were observed and 10 new methanol masers were detected. The new detections are relatively faint with peak flux densities between 0.5 and 4.0 Jy. A nil detection rate from low-mass star forming regions enhances the conclusion that the masers are only associated with massive star formation. Even the faintest methanol maser in our survey, with a luminosity of 1.1 10−9L⊙ is associated with massive stars as inferred from its infrared luminosity.
@article{arxiv.0803.2232,
title = {A high-sensitivity 6.7 GHz methanol maser survey toward H2O sources},
author = {Y. Xu and J. J. Li and K. Hachisuka and J. D. Pandian and K. M. Menten and C. Henkel},
journal= {arXiv preprint arXiv:0803.2232},
year = {2010}
}