Studying Magnetic Fields in Star Forming Regions with Aligned Atoms

Details Studying Magnetic Fields in Star Forming Regions with Aligned Atoms Studying Magnetic Fields in Star Forming Regions with Aligned Atoms

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1719h&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #17.19; Bulletin of the American Astronomical Society, V

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Scientific paper

A new technique of studying interestellar and circumstellar magnetic
fields was developed in Yan & Lazarian (2006). The technique is based on
the ability of atoms with fine and hyperfine structure to be aligned in
their ground or metastable state by anisotropic starlight radiation. The
alignment induces polarization of both scattered and absorbed radiation.
As the aligned atoms precess in magnetic field, the field modifies the
observed polarization. For instance, absorption lines get polarized with
the polarization direction that reveals the direction of magnetic field.
We provide synthetic observations of several optical and UV lines
originating from the vicinity of young stars and demonstrate that the
technique allows to study very weak, e.g. microGauss magnetic fields. In
fact, it can provide unique information about the 3D magnetic field
topology that is not available with any other technique. The expected
degree of polarization may exceed 30% for a favorable geometry of
observations and therefore be easily detectable.

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