Producing synthetic maps of dust polarization using a velocity channel gradient technique
Abstract
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 H I data. By using the velocity channel gradient technique, we are able to predict both the direction and degree of dust polarization by investigating spectroscopic H I information in position-position-velocity space. We apply our approach to the Galactic Arecibo L-band Feed Array H I data, and find a good correspondence between synthesized maps and Planck's polarization measurements at 353 GHz.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- August 2020
- DOI:
- arXiv:
- arXiv:1910.02226
- Bibcode:
- 2020MNRAS.496.2868L
- Keywords:
-
- radio lines: ISM;
- ISM: magnetic fields;
- polarization;
- Diffuse radiation;
- ISM: structure;
- turbulence;
- Astrophysics - Astrophysics of Galaxies;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- 15 pages, 8 figures, submitted to MNRAS