Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.1909y&link_type=abstract
American Astronomical Society Meeting 210, #19.09; Bulletin of the American Astronomical Society, Vol. 39, p.120
Astronomy and Astrophysics
Astrophysics
Scientific paper
The relative population of an atom or ion is subjected to optical pumping by anisotropic radiation flux and magnetic mixing. In the paper we consider a few astrophysically important atoms and ions
with multiple upper and lower levels and calculate their alignment. In particular, we study the situations when
the rate of arrival of exciting photons is comparable or lower than the rate of atomic precession in the external magnetic field. We evaluate how this affects properties of polarized radiation arising from both scattering and absorption by atoms. We study how the degree of linear polarization, the
positional angle and intensity of different lines depend on the 3D geometry of the magnetic field. We show that those dependencies provides a unique tool to study 3D orientation of
magnetic fields in various astrophysical conditions, e.g., interstellar medium, intergalactic medium and QSOs, etc.
Lazarian Alex
Yan Huirong
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