A Model For Polarised Microwave Foreground Emission From Interstellar Dust

TL;DR

This paper develops detailed 3D models of polarized dust emission in the galaxy to aid upcoming CMB experiments in accurately detecting primordial gravitational wave signals.

Contribution

It introduces comprehensive templates of dust emission incorporating magnetic fields, dust properties, and polarization, tailored for future CMB observations.

Findings

Generated polarization templates at 150GHz.

Provided online repository for multi-frequency maps.

Enhanced understanding of Galactic foregrounds for CMB analysis.

Abstract

The upcoming generation of cosmic microwave background (CMB) experiments face a major challenge in detecting the weak cosmic B-mode signature predicted as a product of primordial gravitational waves. To achieve the required sensitivity these experiments must have impressive control of systematic effects and detailed understanding of the foreground emission that will influence the signal. In this paper, we present templates of the intensity and polarisation of emission from one of the main Galactic foregrounds, interstellar dust. These are produced using a model which includes a 3D description of the Galactic magnetic field, examining both large and small scales. We also include in the model the details of the dust density, grain alignment and the intrinsic polarisation of the emission from an individual grain. We present here Stokes parameter template maps at 150GHz and provide an on-line repository (http://www.imperial.ac.uk/people/c.contaldi/fgpol) for these and additional maps at frequencies that will be targeted by upcoming experiments such as EBEX, Spider and SPTpol.