Oral Presentation
Understanding the dust grains alignment and evolution in DR21 filament using JCMT/POL-2
Presenter: Thi My Ngan Le (Korea Astronomy and Space Science Institute (KASI), Korea)
Thermal dust polarimetry has become a powerful diagnostic tool to probe not only the magnetic field but also dust properties, in particular the physics of dust grains alignment and evolution (i.e., grain disruption and growth). The paradigm of Radiative Alignment Torque (RAT) theory developed for the last decades has been used to interpret the dust-induced polarization observations and also to understand the origins of how dust grain alignment and evolution within different scales in the interstellar medium.
In this talk, I will present the analysis of thermal dust polarization observations toward the nearby massive star-forming filament DR21, using the JCMT/POL-2 at 850 microns. I will show results of how polarization degree changes with the physical properties (including gas column density and dust temperature) across the filament. I will also present our interpretation by applying the RAT theory. Lastly, I will present results of thermal dust polarization degree modeling and will compare to observations in order to constraint the dust properties, i.e. grains size, and to understand how the dust grain alignment and evolution in DR21.
asiaa.sinica.edu.tw