Skip to main content

Polarized galactic synchrotron and dust emission and their correlation

Author(s): Choi, Steve K; Page Jr, Lyman A

To refer to this page use:
Abstract: We present an analysis of the level of polarized dust and synchrotron emission using the WMAP9 and Planck data. The primary goal of this study is to inform the assessment of foreground contamination in the cosmic microwave background (CMB) measurements below 200 from 23 to 353 GHz. We compute angular power spectra as a function of sky cut based on the Planck 353 GHz polarization maps. Our primary findings are the following. (1) There is a spatial correlation between the dust emission as measured by Planck at 353 GHz and the synchrotron emission as measured by WMAP at 23 GHz with rho approximate to 0.4 or greater for l < 20 and f(sky) >= 0.5, dropping to rho approximate to 0.2 for 30 < l < 200. (2) A simple foreground model with dust, synchrotron, and their correlation fits well to all possible cross spectra formed with the WMAP and Planck 353 GHz data given the current uncertainties. (3) In the 50% cleanest region of the polarized dust map, the ratio of synchrotron to dust amplitudes at 90 GHz for 50 <= l <= 110 is 0.3(-0.2)(+0.3). Smaller regions of sky can be cleaner although the uncertainties in our knowledge of synchrotron emission are larger. A high-sensitivity measurement of synchrotron below 90 GHz will be important for understanding all the components of foreground emission near 90 GHz.
Publication Date: Dec-2015
Electronic Publication Date: 10-Dec-2015
Citation: Choi, Steve K, Page, Lyman A. (2015). Polarized galactic synchrotron and dust emission and their correlation. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 10.1088/1475-7516/2015/12/020
DOI: doi:10.1088/1475-7516/2015/12/020
ISSN: 1475-7516
Type of Material: Journal Article
Version: Author's manuscript

Items in OAR@Princeton are protected by copyright, with all rights reserved, unless otherwise indicated.