Year: 2015
Type: article
Abstract: A simple one-dimensional model of CH3OH maser is considered. Two techniques are used for the calculation of molecule level populations: the accelerated lambda iteration method and the large velocity gradient (LVG), or Sobolev, approximation. The LVG approximation gives accurate results provided that the characteristic dimensions of the medium are larger than 5–10 lengths of the resonance region. We presume that this condition can be satisfied only for the largest observed maser spot distributions. Factors controlling the pumping of class I and class II methanol masers are considered.
Author: A. V. Nesterenok
Institution: Ioffe Institute
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2260203355