Measurement of the angular power spectrum of the Sunyaev-Zel'dovich (SZ) effect offers a simple way to determine dark-halo abundance at high redshift. In contrast to a conventional number-count analysis of halo abundance, the SZ angular power spectrum is insensitive to observational selection effects, e.g., flux, surface brightness, or volume limit of the survey. The SZ angular power spectrum is also insensitive to poorly known gas physics in the central region of gas in halos, as it is determined by the outer part of gas-pressure profile rather than the inner part. Theoretical understanding to the SZ angular power spectrum is, however, still in the early stage of its development. In this work, we attempt to make a refined analytic prediction for the SZ angular power spectrum, compare it with hydrodynamic simulations, and show that our prediction approximates the simulations well, and can be used to fit forthcoming data of the SZ angular power spectrum to extract cosmological information.

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