Measuring Polarized Emission in Clusters in the CMB S4 Era

Abstract

The next generation of CMB experiments (CMB Stage-4) will produce a Sunyaev-Zel'dovich (SZ) cluster catalog containing $\sim 10^5$ objects, two orders of magnitudes more than currently available. In this paper, we discuss the detectability of the polarized signal generated by scattering of the CMB quadrupole on the cluster electron gas using this catalog. We discuss the possibility of using this signal to measure the relationship between cluster optical depth and mass. We find that the area of observation of S4 maximizes the signal-to-noise (S/N) on the polarized signal but that this S/N is extremely small for an individual cluster, of order 0.5% for a typical cluster in our catalog, the main source of noise being the residual primordial E-mode signal. However, we find that the signal could be detected using the full cluster catalog and that the significance of the result will increase linearly with the size of the CMB S4 telescope mirror.

arXiv comment10 pages, 7 figures, version matching the one published in PRD

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• A new probe of Axion-Like Particles: CMB polarization distortions due to cluster magnetic fields
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• Forecasted constraints on modified gravity from Sunyaev Zel'dovich tomography
• Cosmic birefringence tomography with polarized Sunyaev Zel'dovich effect
• Reconstructing Patchy Reionization with Deep Learning
• Measuring the Homogeneity of the Universe Using Polarization Drift
• A power spectrum approach to the search for Axion-like Particles from resolved galaxy clusters using CMB as a backlight
• SpectrAx: Spectral Search of Axion-Like Particles Using Multi-Band Observations of Galaxy Clusters from SKA, SO, CMB-S4 and eROSITA
• Measuring the cosmological density field twice: A novel test of dark energy using the CMB quadrupole
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• Circumventing Cosmic Variance via Remote Quadrupole Measurements
• Validating dark energy models using polarised Sunyaev-Zel'dovich effect with large-angle CMB temperature and E-mode polarization anisotropies