Clarification and interpretation of the Friedjung-Muratorio self absorption curve method
S.O. Kastner *
Received 7 June 1999 / Accepted 19 July 1999
The Self Absorption Curve (SAC) method of Friedjung and Muratorio is derived directly from a more usual description of emission from optically thick sources. The present derivation shows that the SAC function is the logarithm of the line-of-sight photon escape probability associated with the particular model used. A description of the photon escape probability concept and its present state of development is therefore given, with some examples of source models currently utilized.
Key words: line: identification radiative transfer
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© European Southern Observatory (ESO) 1999
Online publication: November 16, 1999