The candidates for Class I methanol masers

Abstract

The collisional excitation of methanol molecule in non-dissociative magnetohydrodynamic shock waves is considered. All essential chemical processes that determine methanol abundance in the gas are taken into account in the shock model. The large velocity gradient approximation is used in the calculations of energy level populations of the molecule. We calculate the optical depth for inverted methanol transitions, and present the list of candidates for Class I methanol masers that have collisional pumping mechanism.

arXiv comment6 pages, 1 figure, accepted for publication in Journal of Physics: Conference Series

References in corpus (7)

• Southern class I methanol masers at 36 and 44 GHz
• Class I methanol masers in the outflow of IRAS 16547-4247
• Online Database of Class I Methanol Masers
• VLA Survey of Dense Gas in Extended Green Objects: Prevalence of 25 GHz Methanol Masers
• Chemical evolution of the gas in C-type shocks in dark clouds
• C-type shock modelling -- the effect of new H${}_2$-H collisional rate coefficients
• The Sobolev approximation for radiation transport with line overlap and continuous opacity