Grain Alignment and the Magnetic Field Geometry in the Filamentary Dark Cloud GF 9
T. J. Jones;
AJ, 2003, 125, 3208
ABSTRACT:We present measurements of the interstellar polarization at 1.65 μm of stars shining through the filamentary dark cloud GF 9.Unlike many dark clouds, the interstellar polarization through GF 9 increases significantly with increasing extinction through the cloud.
We find the magnetic field geometry in GF 9-core is very smooth, in agreement with results from far-infrared polarimetry by Clemens, Kraemer, & Ciardi (published in 1999).
Our much more limited results for GF 9-filament are consistent with a disordered field, also in agreement with the far-infrared polarimetry.
Comparison of the near-infrared and far-infrared position angles suggests that there is a moderate rotation in the projected magnetic field direction from the exterior to the interior of GF 9-core.
KEYWORDS: ism: magnetic fields
PERSOKEY:polarisation, extinction, nir, molecular clouds, ,
CODE: jones2003