Near Infrared Circular Polarization Images of NGC 6334-V

TL;DR

This study presents deep polarimetric imaging of NGC 6334- V, revealing high and extended circular polarization likely caused by scattering and dust grain alignment, providing insights into magnetic fields and potential origins of biological homochirality.

Contribution

It demonstrates high, extended circular polarization in NGC 6334- V and models its origin through scattering and dust grain alignment, linking magnetic fields to polarization patterns.

Findings

High circular polarization up to 22% in Ks band.

Extended CP pattern (~0.65 pc) larger than in Orion.

CP may originate from scattering and dust grain alignment.

Abstract

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.