A flare of methanol maser in S255
ATel #8286; Kenta Fujisawa (Yamaguchi University), Yoshinori Yonekura, Koichiro Sugiyama (Ibaraki University), Hikari Horiuchi, Takehiro Hayashi, Kazuya Hachisuka, Naoko Matsumoto, Kotaro Niinuma (Yamaguchi University)
on 16 Nov 2015; 07:38 UT
Credential Certification: Kenta Fujisawa (kenta@yamaguchi-u.ac.jp)
Subjects: Radio, Young Stellar Object
Now a flaring methanol maser line at 6.7 GHz can be observed in the source S255. This is the first flare of this maser line in S255 since the first report in 1991 by Menten (ApJ, 380, L75). The peak flux density of this maser ranged between 60 and 100 Jy with Vlsr centered around 4.8 km/s in the previous studies. The flux density of a component with Vlsr = 5.6 km/s started increasing from 150 Jy on July 7 (MJD = 57210) to 1600 Jy on Oct 22 (MJD = 57317). The flux density of another component with Vlsr = 6.2 km/s reached to 1500 Jy on Nov 6 (MJD = 57333) with a time delay of 20 days to the component with Vlsr = 5.6 km/s. The component with Vlsr = 6.2 km/s has been not reported in previous studies.
