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Prospects for an independent measurement of the l = 1, 2, 3 CMB anisotropy multipoles using the anisotropic Sunyaev-Zel’dovich effect
We investigate the prospects for observing a specific spectral distortion of the cosmic microwave
background, which occurs due to the anisotropy of the radiation when it is scattered by hot plasma of
galaxy clusters. Detection of this anisotropic Sunyaev-Zel’dovich effect would enable an independent
measurement of the CMB anisotropy multipoles with l 1⁄4 1, 2, 3, allow the Sachs-Wolfe and integrated
Sachs-Wolfe (Rees-Sciama) effects to be separated, and partially solve the cosmic variance problem for
low multipoles. We applied the Least Response Method for component separation in the data processing
and estimated the required sensitivity of the experiment for such observations. We test our approach on a
simulated signal that is contaminated by various foregrounds with poorly defined spectral shapes, along
with distortions of the relic blackbody spectrum caused by the Sunyaev-Zel’dovich effect and its
relativistic corrections.