  We present results from deep imaging linear and circular polarimetry of the
massive star-forming region NGC 6334- V. These observations show high degrees
of circular polarization (CP), as much as 22 % in the Ks band, in the infrared
nebula associated with the outflow. The CP has an asymmetric positive/negative
pattern and is very extended (~80" or 0.65 pc). Both the high CP and its
extended size are larger than those seen in the Orion CP region.
Three-dimensional Monte Carlo light-scattering models are used to show that the
high CP may be produced by scattering from the infrared nebula followed by
dichroic extinction by an optically thick foreground cloud containing aligned
dust grains. Our results show not only the magnetic field orientation of around
young stellar objects but also the structure of circumstellar matter such as
outflow regions and their parent molecular cloud along the line of sight. The
detection of the large and extended CP in this source and the Orion nebula may
imply the CP origin of the biological homochirality on Earth.
