Relativistic SZ maps and electron gas temperature spectroscopy
Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
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Published online: 17 January 2022
While third-generation CMB experiments have allowed to release the first maps of Compton-y distortion due to thermal Sunyaev-Zeldovich (SZ) effect, next-generation CMB experiments should allow us to map also the electron gas temperature, Te, across the sky through the detection of relativistic corrections to the thermal SZ effect. We discuss about experimental requirements to break the y-Te degeneracy of the observed SZ intensity, and propose a new component separation approach based on moment expansion to disentangle the y and Te observables of the relativistic SZ effect while mitigating foregrounds. We show how our approach offers a new spectroscopic view of the clusters not only across frequencies but now also across temperatures. We also show how the relativistic electron temperature power spectrum provides a new cosmological observable which may complement the Compton-y map power spectrum to break some of the parameter degeneracies in future cosmological SZ analyses.
© The Authors, published by EDP Sciences, 2022
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