Producing Synthetic Maps of Dust Polarization using Velocity Channel Gradient Technique

In modern cosmology, many efforts have been made to detect the primordial B-mode of cosmic microwave background polarization from gravitational waves generated during inflation. Considering the foreground dust contamination of microwave polarization maps, it is essential to obtain a precise prediction for polarization in dust emission. In this work, we show a new method to produce synthetic maps of dust polarization in the magnetized turbulent interstellar medium from more abundant high-resolution HI data. By using the velocity channel gradient technique, we are able to predict both the direction and degree of dust polarization by investigating spectroscopic HI information in position-position-velocity space. We apply our approach to the Galactic Arecibo L-band Feed Array HI data, and find a good correspondence between synthesized maps and Planck's polarization measurements at 353 GHz.