Contamination of cluster radio sources in the measurement of the thermal Sunyaev - Zel ’ dovich angular power spectrum

We present a quantitative estimate of the confusion of cluster radio halos and galaxies in the measurement of the angular power spectrum of the thermal Sunyaev-Zel’dovich (SZ) effect. To achieve the goal, we use a purely analytic approach to both radio sources and dark matter of clusters by incorporating empirical models and observational facts together with some theoretical considerations. It is shown that the correction of cluster radio halos and galaxies to the measurement of the thermal SZ angular power spectrum is no more than 20% at l > 2000 for observing frequencies ν > 30 GHz. This eliminates the concern that the SZ measurement may be seriously contaminated by the existence of cluster radio sources. Subject headings: cosmology: theory — diffuse radiation — radio continuum: general