Open AccessIncrease of brightness and radiation temperature in a non‐inverted medium: does this work in astrophysical masers?
Author(s) -
Shepelev A. V.
Publication year - 2007
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 - 10.1111/j.1365-2966.2007.11824.x
Subject(s) - physics , maser , brightness temperature , brightness , radiation , astrophysics , work (physics) , astronomy , optics , thermodynamics
The general conditions for the increase of brightness and radiation temperature are discussed. It is shown that such an increase is possible in a non‐inverted medium, and perhaps actually takes place even in some cases of bright hydroxyl sources, which are usually treated as masers.