Characterizing line-of-sight variability of polarized dust emission with future cmb experiments
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Date
2023
Journal Title
Journal ISSN
Volume Title
Publisher
Oxford University Press
Abstract
While Galactic dust emission is often accounted for in cosmic microwave background (CMB) analyses by fitting a two-parameter modified blackbody (MBB) model in each pixel, typically a number of such clouds are found along each line of sight and within each angular pixel, resulting in a superposition of their spectra. We study the effects of this superposition on pixel-based foreground fitting strategies by modeling the spectral energy distribution (SED) in each pixel as the integral of individual MBB spectra over various physically motivated statistical distributions of dust cloud properties. We show that fitting these SEDs with the two-parameter MBB model generally results in unbiased estimates of the CMB Stokes Q and U amplitudes per pixel, unless there are significant changes in both the dust SED and polarization angle along the line of sight, in which case significant (>10σ) biases are observed in an illustrative model.
Description
Keywords
Cosmic background radiation, Dust, Extinction, Polarization, spectral energy distribution
Citation
McBride, L., Bull, P. and Hensley, B.S., 2023. Characterizing line-of-sight variability of polarized dust emission with future CMB experiments. Monthly Notices of the Royal Astronomical Society, 519(3), pp.4370-4383.