Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974hrgc.conf..179h&link_type=abstract
H II regions and the galactic centre : proceedings of the Eighth ESLAB Symposium, 4-7 June 1974, Frascati, Italy, p. 179-184 (SE
Astronomy and Astrophysics
Astronomy
Far Infrared Radiation, Galactic Nuclei, Hydrogen Clouds, Polarization Characteristics, Grains, Infrared Astronomy, Masers, Orion Constellation, Synchrotron Radiation, Wave Amplification
Scientific paper
The expected polarization of far infrared sources is discussed, and it is shown that the observed degree of polarization generally depends on two factors: (1) the availability of a mechanism that can produce polarization, and (2) the gain in polarization which absorption or stimulated emission can produce within a source. It is pointed out that stimulated emission could produce sizeable gain changes in compact dust clouds such as those associated with H2 regions and possibly also in dense regions exhibiting OH and H2O masers. Whether such a gain can actually become positive (maser-like behavior) is not clear, but this would in any case depend on the chemical structure of the grain material and the spectral range of interest.
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