QUIJOTE scientific results - XII. Characterization of the polarized synchrotron emission at the power spectrum level in the QUIJOTE-MFI wide survey
Abstract
We present an analysis of the polarized synchrotron emission at the power-spectrum level in the multipole range 30 < ℓ < 130, using the recent QUIJOTE-MFI wide survey (10-20GHz) in combination with Planck and WMAP data. The EE and BB power spectra are well described by a simple power-law model, with no evidence for the need of additional parameters. The best-fit slopes are αEE = −3.24 ± 0.12 and αBB = −3.81 ± 0.34 for |b|>20∘, hinting toward a steepening of the BB spectrum relative to EE at the ∼ 1.6σ level. The synchrotron frequency spectral indices are found to be βsEE = −3.26 ± 0.05 and βsBB = −3.25 ± 0.10 for the same cut, in agreement with earlier real-space analyses. We find no evidence for spatial variations of βs across different Galactic latitude cuts, within current uncertainties. The synchrotron BB/EE power ratio is approximately 0.2 over the considered multipole range, lower than typical values for thermal dust, and consistent with previous measurements. We also measure a dust-synchrotron spatial correlation in the range 0.1-0.25 over 30 < ℓ < 130. Using these results, we estimate the level of synchrotron contamination in future CMB B-mode measurements, finding an average power in the considered sky masks equivalent to r ∼ 0.003 at 90GHz and r ∼ 0.0002 at 150GHz for the relevant angular scales.
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BibTeX
@misc{vansyngel2026quijote,
title = {{QUIJOTE scientific results - XII. Characterization of the polarized synchrotron emission at the power spectrum level in the QUIJOTE-MFI wide survey}},
author = {F. Vansyngel and J. A. Rubino-Martin and P. de Ferra and R. B. Barreiro and R. T. Genova-Santos and B. Casaponsa and M. Fernandez-Torreiro and D. Adak and K. Aryan and M. Ashdown and J. M. Casas and F. J. Casas and R. Cepeda-Arroita and A. Fasano and D. Herranz and E. Martinez-Gonzalez and F. Poidevin and R. Rebolo and B. Ruiz-Granados and D. Tramonte and P. Vielva and R. A. Watson},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.31469},
eprint = {2610.31469},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.31469},
}
RIS
TY - UNPB
TI - QUIJOTE scientific results - XII. Characterization of the polarized synchrotron emission at the power spectrum level in the QUIJOTE-MFI wide survey
AU - F. Vansyngel
AU - J. A. Rubino-Martin
AU - P. de Ferra
AU - R. B. Barreiro
AU - R. T. Genova-Santos
AU - B. Casaponsa
AU - M. Fernandez-Torreiro
AU - D. Adak
AU - K. Aryan
AU - M. Ashdown
AU - J. M. Casas
AU - F. J. Casas
AU - R. Cepeda-Arroita
AU - A. Fasano
AU - D. Herranz
AU - E. Martinez-Gonzalez
AU - F. Poidevin
AU - R. Rebolo
AU - B. Ruiz-Granados
AU - D. Tramonte
AU - P. Vielva
AU - R. A. Watson
PY - 2026
DA - 2026/10/22
PB - arXiv
DO - 10.48550/arxiv.2610.31469
UR - https://arxiv.org/abs/2610.31469
AB - We present an analysis of the polarized synchrotron emission at the power-spectrum level in the multipole range 30 < ℓ < 130, using the recent QUIJOTE-MFI wide survey (10-20GHz) in combination with Planck and WMAP data. The EE and BB power spectra are well described by a simple power-law model, with no evidence for the need of additional parameters. The best-fit slopes are α_EE = −3.24 ± 0.12 and α_BB = −3.81 ± 0.34 for |b|>20^∘, hinting toward a steepening of the BB spectrum relative to EE at the ∼ 1.6σ level. The synchrotron frequency spectral indices are found to be β_s^EE = −3.26 ± 0.05 and β_s^BB = −3.25 ± 0.10 for the same cut, in agreement with earlier real-space analyses. We find no evidence for spatial variations of β_s across different Galactic latitude cuts, within current uncertainties. The synchrotron BB/EE power ratio is approximately 0.2 over the considered multipole range, lower than typical values for thermal dust, and consistent with previous measurements. We also measure a dust-synchrotron spatial correlation in the range 0.1-0.25 over 30 < ℓ < 130. Using these results, we estimate the level of synchrotron contamination in future CMB B-mode measurements, finding an average power in the considered sky masks equivalent to r ∼ 0.003 at 90GHz and r ∼ 0.0002 at 150GHz for the relevant angular scales.
ER -