BEYONDPLANCK

We constrained the level of polarized anomalous microwave emission (AME) on large angular scales using Planck Low-Frequency Instrument (LFI) and WMAP polarization data within a Bayesian cosmic microwave background (CMB) analysis framework. We modeled synchrotron emission with a power-law spectral en...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2023-07, Vol.675
Main Authors: Herman, D, Hensley, B, Andersen, K J, Aurlien, R, Banerji, R, Bersanelli, M, Bertocco, S, Brilenkov, M, Carbone, M, Colombo, L P L, Eriksen, H K, Foss, M K, Fuskeland, U, Galeotta, S, Galloway, M, Gerakakis, S, Gjerløw, E, Iacobellis, M, Ieronymaki, M, Ihle, H T, Jewell, J B, Karakci, A, Keihänen, E, Keskitalo, R, Maggio, G, Maino, D, Maris, M, Paradiso, S, Partridge, B, Reinecke, M, A.-S. Suur-Uski, Svalheim, T L, Tavagnacco, D, Thommesen, H, Wehus, I K, Zacchei, A
Format: Article
Language:English
Subjects:
Confidence limits
Constraints
Cosmic microwave background
Dust
Emission analysis
Microwave emission
Polarization
Spectral energy distribution
Statistical analysis
Synchrotrons
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Summary:We constrained the level of polarized anomalous microwave emission (AME) on large angular scales using Planck Low-Frequency Instrument (LFI) and WMAP polarization data within a Bayesian cosmic microwave background (CMB) analysis framework. We modeled synchrotron emission with a power-law spectral energy distribution, as well as the sum of AME and thermal dust emission through linear regression with the Planck High-Frequency Instrument (HFI) 353 GHz data. This template-based dust emission model allowed us to constrain the level of polarized AME while making minimal assumptions on its frequency dependence. We neglected CMB fluctuations, but show through simulations that these fluctuations have a minor impact on the results. We find that the resulting AME polarization fraction confidence limit is sensitive to the polarized synchrotron spectral index prior. In addition, for prior means βs 
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/202243081