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 < −3.1 we find an upper limit of pAMEmax ≲ 0.6% (95% confidence). In contrast, for means βs = −3.0, we find a nominal detection of pAME = 2.5 ± 1.0% (95% confidence). These data are thus not strong enough to simultaneously and robustly constrain both polarized synchrotron emission and AME, and our main result is therefore a constraint on the AME polarization fraction explicitly as a function of βs. Combining the current Planck and WMAP observations with measurements from high-sensitivity low-frequency experiments such as C-BASS and QUIJOTE will be critical to improve these limits further.

BeyondPlanck XV. Limits on large-scale polarized anomalous microwave emission from Planck LFI and WMAP / D. Herman, B. Hensley, K.J. Andersen, R. Aurlien, R. Banerji, M. Bersanelli, S. Bertocco, M. Brilenkov, M. Carbone, L.P.L. Colombo, H.K. Eriksen, M.K. Foss, U. Fuskeland, S. Galeotta, M. Galloway, S. Gerakakis, E. Gjerløw, M. Iacobellis, M. Ieronymaki, H.T. Ihle, J.B. Jewell, A. Karakci, E. Keihänen, R. Keskitalo, G. Maggio, D. Maino, M. Maris, S. Paradiso, B. Partridge, M. Reinecke, A.-. Suur-Uski, T.L. Svalheim, D. Tavagnacco, H. Thommesen, I.K. Wehus, A. Zacchei. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - 675:(2023 Jul), pp. A15.1-A15.10. [10.1051/0004-6361/202243081]

BeyondPlanck XV. Limits on large-scale polarized anomalous microwave emission from Planck LFI and WMAP

M. Bersanelli;L.P.L. Colombo;D. Maino;S. Paradiso;
2023

Abstract

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 < −3.1 we find an upper limit of pAMEmax ≲ 0.6% (95% confidence). In contrast, for means βs = −3.0, we find a nominal detection of pAME = 2.5 ± 1.0% (95% confidence). These data are thus not strong enough to simultaneously and robustly constrain both polarized synchrotron emission and AME, and our main result is therefore a constraint on the AME polarization fraction explicitly as a function of βs. Combining the current Planck and WMAP observations with measurements from high-sensitivity low-frequency experiments such as C-BASS and QUIJOTE will be critical to improve these limits further.
cosmic background radiation / dust / extinction / methods: statistical / radio continuum: ISM;
Settore FIS/05 - Astronomia e Astrofisica
   Beyond Planck -- delivering state-of-the-art observations of the microwave sky from 30 to 70 GHz for the next decade
   BeyondPlanck
   European Commission
   Horizon 2020 Framework Programme
   776282

   Cosmoglobe -- mapping the universe from the Milky Way to the Big Bang
   Cosmoglobe
   European Commission
   Horizon 2020 Framework Programme
   819478

   Time-domain Gibbs sampling: From bits to inflationary gravitational waves
   Bits2Cosmology
   European Commission
   Horizon 2020 Framework Programme
   772253
lug-2023
28-giu-2023
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/981088
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