Population inversion and saturation behaviour of celestial masers in dusty regions

Details Population inversion and saturation behaviour of celestial masers in dusty regions Population inversion and saturation behaviour of celestial masers in dusty regions

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....93....8b&link_type=abstract

Astronomy and Astrophysics, vol. 93, no. 1-2, Jan. 1981, p. 8-19.

Astronomy and Astrophysics

Astrophysics

1

Cosmic Dust, Energy Levels, Interstellar Masers, Population Inversion, Protostars, Radiation Absorption, Brightness Temperature, Continuous Radiation, Infrared Lasers, Kinetic Equations, Saturation, Space Density, Stellar Envelopes, Transport Properties, Water Masers

Scientific paper

The influence of continuous absorption by dust on the efficiency of a three level maser model is investigated. To this end the stationary rate equations are analytically solved. By means of this solution the basic physical properties of the model are discussed. The two levels with a small energy separation turn out to be inverted in a certain domain of the density temperature plane provided the two line intensities are well below their saturation values. For high infrared intensities the condition for population inversion becomes eventually violated. However, this situation is essentially changed when cold dust of a sufficiently high density is present. In the latter case a complete analytic solution of the two coupled radiation transport equations is given in the case of a spherically symmetric and homogeneous cloud. Maser emission in dusty cocoons around protostars is discussed as an example for a more realistic inhomogeneous background, in which maser emission may be generated.

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