Producing synthetic maps of dust polarization using a velocity channel gradient technique. Issue 3 (6th June 2020)

• Record Type: Journal Article
• Authors: Lu, Zekun; Lazarian, A; Pogosyan, Dmitri
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 496:Issue 3(2020)
• Page Start: 2868
• Page End: 2884
• Publication Date: 2020-06-06
• Subjects: turbulence -- polarization -- diffuse radiation -- ISM: magnetic fields -- ISM: structure -- radio lines: ISM; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/staa1570
• Languages: English
• ISSNs: 0035-8711

Abstract

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.