A high-sensitivity 6.7 GHz methanol maser survey toward HO sources*
Max-Planck-Institute für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany e-mail: firstname.lastname@example.org
2 Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, PR China
3 Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 20030, PR China
Accepted: 6 March 2008
We present the results of a high sensitivity survey for 6.7 GHz methanol masers towards 22 GHz water masers 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 of 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 , is associated with massive stars, as inferred from its infrared luminosity.
Key words: masers / surveys / stars: formation / ISM: molecules
© ESO, 2008