Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 12, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2015/12/020
Keywords
gravitational waves and CMBR polarization; CMBR polarisation
Funding
- U.S. National Science Foundation [PHY-1214379]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1214379] Funding Source: National Science Foundation
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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.
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