Open AccessMonitoring of 6‐cm excited OH masers – II
Author(s) -
Smits Derck P.
Publication year - 2003
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2003.06096.x
Subject(s) - maser , physics , excited state , astrophysics , flux (metallurgy) , astronomy , atomic physics , materials science , metallurgy
A search towards 69 star‐forming regions has led to the discovery of three new 4765‐MHz excited OH masers. No 4750‐ or 4660‐MHz excited OH masers were detected above a level of ∼1 Jy. The results of monitoring nine sources of 4765‐MHz excited OH masers for periods of up to 7 yr are reported. Many of the linewidths are narrow and have had constant widths and centroid velocities throughout the monitoring period. The maser flux of one source was constant over 7 yr while in the most extreme case of variability the flux doubled in a period of 2 weeks.