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- W3206435660 abstract "If there is a substantial cosmological radio background, there should be a radio Sunyaev-Zeldovich (SZ) effect that goes along with it. The radio background Comptonization leads to a slight photon excess at all wavelengths, while Comptonization of the CMB at low frequencies leads to a decrement. For levels of the radio background consistent with observations, these effects cancel each other around $nusimeq 735~$MHz, with an excess at lower frequencies and a decrement at higher frequencies. Assuming a purely cosmological origin of the observed ARCADE radio excess, at $nu lesssim 20,{rm GHz}$ the signal scales as $Delta T / T_{rm CMB}simeq 2,yleft[ (nu/735,{rm MHz})^{-2.59}-1right]$ with frequency and the Compton-$y$ parameter of the cluster. For a typical cluster, the total radio SZ signal is at the level of $Delta Tsimeq 1,{rm mK}$ around the null, with a steep scaling towards radio frequencies. This is above current raw sensitivity limits for many radio facilities at these wavelengths, providing a unique way to confirm the cosmological origin of the ARCADE excess and probe its properties (e.g., redshift dependence and isotropy). We also give an expression to compute the radio-analogue of the kinematic SZ effect, highlighting that this might provide a new tool to probe large-scale velocity fields and the cosmic evolution of the radio background." @default.
- W3206435660 created "2021-10-25" @default.
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- W3206435660 date "2021-10-15" @default.
- W3206435660 modified "2023-09-27" @default.
- W3206435660 title "The radio SZ effect as a probe of the cosmological radio background" @default.
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