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Astron. Astrophys. 351, 1016-1020 (1999)

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Clarification and interpretation of the Friedjung-Muratorio self absorption curve method

S.O. Kastner *

1-A Ridge Road, Greenbelt, MD 20770, USA

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 [FORMULA] 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

* deceased August 25, 1999

Send offprint requests to: Joll Kastner (jhkpci@cis.rit.edu)

© European Southern Observatory (ESO) 1999

Online publication: November 16, 1999