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 ∼105 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.
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Phys.Rev.D, 2017, 96 (12), pp.123509. 〈10.1103/PhysRevD.96.123509〉
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https://hal.archives-ouvertes.fr/hal-01669777
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Soumis le : jeudi 21 décembre 2017 - 00:39:03
Dernière modification le : jeudi 11 janvier 2018 - 06:14:28

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Thibaut Louis, Emory Bunn, Benjamin Wandelt, Joseph Silk. Measuring Polarized Emission in Clusters in the CMB S4 Era. Phys.Rev.D, 2017, 96 (12), pp.123509. 〈10.1103/PhysRevD.96.123509〉. 〈hal-01669777〉

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