QUIJOTE scientific results - VIII. Diffuse polarized foregrounds from component separation with QUIJOTE-MFI

de la Hoz, E.; Barreiro, R. B.; Vielva, P.; Martínez-González, E.; Rubiño-Martín, J. A.; Casaponsa, B.; Guidi, F.; Ashdown, M.; Génova-Santos, R. T.; Artal, E.; Casas, F. J.; Fernández-Cobos, R.; Fernández-Torreiro, M.; Herranz, D.; Hoyland, R. J.; Lasenby, A. N.; López-Caniego, M.; López-Caraballo, C. H.; Peel, M. W.; Piccirillo, L.; Poidevin, F.; Rebolo, R.; Ruiz-Granados, B.; Tramonte, D.; Vansyngel, F.; Watson, R. A.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society

Advertised on:
3
2023
Number of authors
26
IAC number of authors
12
Citations
10
Refereed citations
9
Description
We derive linearly polarized astrophysical component maps in the Northern Sky from the QUIJOTE-MFI data at 11 and 13 GHz in combination with the Wilkinson Microwave Anisotropy Probe K and Ka bands (23 and 33 GHz) and all Planck polarized channels (30-353 GHz), using the parametric component separation method B-SeCRET. The addition of QUIJOTE-MFI data significantly improves the parameter estimation of the low-frequency foregrounds, especially the estimation of the synchrotron spectral index, βs. We present the first detailed βs map of the Northern Celestial Hemisphere at a smoothing scale of 2°. We find statistically significant spatial variability across the sky. We obtain an average value of -3.08 and a dispersion of 0.13, considering only pixels with reliable goodness of fit. The power-law model of the synchrotron emission provides a good fit to the data outside the Galactic plane but fails to track the complexity within this region. Moreover, when we assume a synchrotron model with uniform curvature, cs, we find a value of cs = -0.0797 ± 0.0012. However, there is insufficient statistical significance to determine which model is favoured, either the power law or the power law with uniform curvature. Furthermore, we estimate the thermal dust spectral parameters in polarization. Our cosmic microwave background, synchrotron, and thermal dust maps are highly correlated with the corresponding products of the PR4 Planck release, although some large-scale differences are observed in the synchrotron emission. Finally, we find that the βs estimation in the high signal-to-noise synchrotron emission areas is prior-independent, while, outside these regions, the prior governs the βs estimation.
Related projects
The QUIJOTE experiment at the Teide Observatory
QUIJOTE CMB Experiment (Q-U-I JOint TEnerife CMB Experiment)
QUIJOTE es un programa de dos telescopios y su batería de instrumentos, instalados en el Observatorio del Teide, dedicados fundamentalmente a la caracterización de la polarización del Fondo Cósmico de Microondas, en el rango de frecuencias de 10-42 GHz.
José Alberto
Rubiño Martín
Full-sky map showing the spatial distribution of the primary anisotropies of the Cosmic Microwave Background (generated 380,000 years after the Big Bang) derived from observations of the Planck satellite
Anisotropy of the Cosmic Microwave Background
The general goal of this project is to determine and characterize the spatial and spectral variations in the temperature and polarisation of the Cosmic Microwave Background in angular scales from several arcminutes to several degrees. The primordial matter density fluctuations which originated the structure in the matter distribution of the present
Rafael
Rebolo López