Title :

Revisiting the large-scale CMB anomalies: The impact of the SZ signal from the Local Universe

Author(s) :

Jung, Gabriel [Auteur]
Institut d'astrophysique spatiale [IAS]
Aghanim, Nabila [Auteur]
Institut d'astrophysique spatiale [IAS]
Sorce, Jenny [Auteur]
Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 [CRIStAL]
Institut d'astrophysique spatiale [IAS]
Université de Lille, Sciences et Technologies
Seidel, Benjamin [Auteur]
Dolag, Klaus [Auteur]
Douspis, Marian [Auteur]
Institut d'astrophysique spatiale [IAS]

HAL domain(s) :

Physique [physics]/Astrophysique [astro-ph]

English abstract : [en]

The full sky measurements of the Cosmic Microwave Background (CMB) temperature anisotropies by $\textit{WMAP}$ and $\textit{Planck}$ have highlighted the presence of several unexpected isotropy-breaking features on the ...
Show more >The full sky measurements of the Cosmic Microwave Background (CMB) temperature anisotropies by $\textit{WMAP}$ and $\textit{Planck}$ have highlighted the presence of several unexpected isotropy-breaking features on the largest angular scales. In this work, we investigate the impact of the local large-scale structure on these anomalies through the thermal and kinetic Sunyaev-Zeldovich effects. We use a constrained hydrodynamical simulation that reproduces the local Universe in a box of $500\,h^{-1}\,$Mpc to construct full sky maps of the temperature anisotropies produced by these two CMB secondary effects and discuss their statistical properties on large angular scales. We show the significant role played by the Virgo cluster on these scales, and compare it to theoretical predictions and random patches of the universe obtained from the hydrodynamical simulation $\textit{Magneticum}$. We explore three of the main CMB large-scale anomalies -- i.e., lack of correlation, quadrupole-octopole alignment and hemispherical asymmetry -- , both in the latest $\textit{Planck}$ data (PR4), where they are detected at a similar level to the previous releases, and using the simulated secondaries from the local Universe, verifying their negligible impact.Show less >

Language :

Anglais

Collections :

• Centre de Recherche en Informatique, Signal et Automatique de Lille (CRIStAL) - UMR 9189

Source :

Harvested from HAL

Submission date :

2025-01-30T03:28:19Z