Po-Sheng Ou (ASIAA/NTU); Geoffrey Bower (ASIAA); Kai-Yang Lin (ASIAA)
Methanol masers are often found in high-mass star forming regions. The variability of methanol masers can help understand the pumping mechanism, and also the physical conditions in the star forming regions. While the Class II methanol masers are well known as variating sources, the variability of Class I methanol masers is still uncertain. There is a lack of observations of Class I methanol masers at different times, and a long-term monitoring of these masers can help determine their variability. The frequency range of Yuan-Tseh Lee Array (YTLA) includes the 95 GHz methanol maser line, and thus it is suitable for monitoring the variability of these masers. In this poster, we report the YTLA observations of 95 GHz methanol masers in 2018 to 2020. We continue to monitor some bright maser sources during this period, and also observe some maser sources claimed in the catalog compiled by Yang et al. to compare with their reported fluxes.