Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.4912y&link_type=abstract
American Astronomical Society Meeting 208, #49.12; Bulletin of the American Astronomical Society, Vol. 38, p.126
Other
Scientific paper
The relative population of the sublevels of the hyperfine-splitground state of an atom or ion is affected byresonant scattering of anisotropic radiation and by magnetic mixing. Emissions from such aligned atoms will be modulated and polarized according to 3D geometry of the magnetic field as well as radiation. This allows the detection of magnetic field in interstellar medium and establish other important astrophysical parameters. In particular we study alignment of neutral Sodium and Hydrogen within their hyperfine structures. We obtain their corresponding line intensity ratios and polarizations. Their dependence on the 3D geometry of the magnetic field is demonstrated. We consider not only steady state but also time-dependent alignment. We exemplify the utility of atomic alignment for studies of astrophysical magnetic fields. Our study also shows that the transmission of HI 21cm line in interstellar medium will be modified by atomic alignment and this may be related to the tiny-scale atomic structure observed in interstellar gas.
Lazarian Alex
Yan Huirong
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