New SMICA formalism and binned bispectrum estimator jointly recover power spectra, spectral parameters, foreground 3-point correlators, and primordial non-Gaussianity constraints from multi-frequency polarization maps tested on LiteBIRD simulations.
CMB foregrounds - A brief review
4 Pith papers cite this work. Polarity classification is still indexing.
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Pith papers citing it
abstract
CMB foregrounds consist of all radiation between the surface of last scattering and the detectors, which can interfere with the cosmological interpretation of CMB data. Fortunately, in temperature (intensity), even though the foregrounds are complex they can relatively easily be mitigated. However, in polarization, diffuse Galactic radiation (synchrotron and thermal dust) can be polarized at a level of >10 % making it more of a challenge. In particular, CMB B-modes, which are a smoking-gun signature of inflation, will be dominated by foregrounds. Component separation will therefore be critical for future CMB polarization missions, requiring many channels covering a wide range of frequencies, to ensure that foreground modelling errors are minimised.
verdicts
UNVERDICTED 4representative citing papers
MHD shocks flatten the EE/BB ratio of polarized ISM emission to values ≳1 as energy injection increases, accompanied by a -7/2 power-law tail in velocity divergence.
Simulations show that combining QUIJOTE-MFI2 with WMAP and Planck reduces synchrotron spectral index uncertainty by a factor of ~10, curvature uncertainty by ~5, and polarization amplitude uncertainty by ~43 in bright regions while cutting 100 GHz residuals by a factor of 6.
Comparison of Galactic magnetic field models to polarized synchrotron observations shows good agreement on angles but poor match on intensity, indicating local foreground structures must be incorporated.
citing papers explorer
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Non-Gaussianity in SMICA
New SMICA formalism and binned bispectrum estimator jointly recover power spectra, spectral parameters, foreground 3-point correlators, and primordial non-Gaussianity constraints from multi-frequency polarization maps tested on LiteBIRD simulations.
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Forecasting synchrotron spectral parameters with QUIJOTE-MFI2 in combination with Planck and WMAP
Simulations show that combining QUIJOTE-MFI2 with WMAP and Planck reduces synchrotron spectral index uncertainty by a factor of ~10, curvature uncertainty by ~5, and polarization amplitude uncertainty by ~43 in bright regions while cutting 100 GHz residuals by a factor of 6.