Infrared spectropolarimetry of the galactic-center-magnetic alignment in the discrete sources
The results of 8-13 micron spectropolarimetric observations of Galactic Center sources are presented. All the sources show interstellar polarization due to absorption by aligned silicate grains, and these grains appear to be spatially separated along the line-of-sight from those which produce the polarization at shorter wavelengths. The line of sources IRS 1, 10, 5, and 8 comprising the northern arc all show strong intrinsic polarization due to thermal emission from aligned grains of amorphous silicate-like material. This polarization is very uniform among these sources with position angle closely normal to the line of the arc. It is shown that the data are inconsistent with grain alignment due to streaming, but favor alignment by a strong magnetic field greater than 10 mG directed along and linking the northern arc of sources. A field of this magnitude will have significant influence on the structure and evolution of sources in the Galactic Center. Some possible implications are discussed.