Détail du document
Identifiant

oai:arXiv.org:2408.06214

Sujet
Astrophysics - Cosmology and Nonga... Astrophysics - Astrophysics of Gal...
Auteur
Hervías-Caimapo, Carlos Cukierman, Ari J. Diego-Palazuelos, Patricia Huffenberger, Kevin M. Clark, Susan E.
Catégorie

sciences : astrophysique

Année

2024

Date de référencement

09/04/2025

Mots clés
planck data misalignment dust angle astrophysics
Métrique

Résumé

We extend the dust-filament-based model presented in Herv\'ias-Caimapo & Huffenberger 2022 to produce parity-violating foreground spectra by manipulating the filament orientations relative to the magnetic field.

We calibrate our model to observations of the misalignment angle using cross-correlations of Planck and HI 21-cm line data, producing a fiducial model that predicts a $\mathcal{D}_{\ell}^{EB}\sim$few $\mu$K$^2$ dust signal at 353 GHz and where $\sim 56$\% of filaments have a positive misalignment angle.

The main purpose of this model is to be used as dust with non-zero parity-violating emission in forecasting a measurement of cosmic birefringence by upcoming experiments.

Here, we also use our fiducial model to assess the impact of dust in measurements of the isotropic cosmic birefringence angle $\beta$ with Planck data by measuring the misalignment angle as a function of scale, as well as directly using our model's $\mathcal{D}_{\ell}^{EB}$ prediction as a template.

In both cases, we measure $\beta$ to be consistent within $0.83\sigma$ of the analyses that use the 353 GHz channel of Planck to constrain the filamentary misalignment or that use the commander sky model as a template for the dust $\mathcal{D}_{\ell}^{EB}$ spectrum.

We attribute this consistency to the extra degrees of freedom introduced by the ad-hoc amplitude parameters for the dust parity-violating spectrum, which are capable of absorbing most of the differences between the model and data as long as a reasonable dust model is provided.

;Comment: 26 pages, 17 figures, 5 tables, 2 Appendices.

Accepted for publication by Physical Review D

Hervías-Caimapo, Carlos,Cukierman, Ari J.,Diego-Palazuelos, Patricia,Huffenberger, Kevin M.,Clark, Susan E., 2024, Modeling parity-violating spectra in Galactic dust polarization with filaments and its applications to cosmic birefringence searches

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