Kinetic Sunyaev-Zel'dovich effect from halo rotation

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  • 28 July 2001
Abstract
We discuss the kinetic Sunyaev-Zel'dovich (SZ) contribution to cosmic microwave background (CMB) temperature fluctuations due to the coherent rotational velocity component of electrons within halos. For typical clusters of mass a few times 10^14 M_sun, this rotational scattering effect produces a distinct dipole-like temperature distribution with a peak fluctuation of the order a few micro Kelvin, depending on the rotational velocity and the inclination angle of the rotation axis. This dipole signature is similar to the one produced by lensed CMB towards galaxy clusters, though the lensing contribution spans a larger angular extent than the one due to rotational scattering. The angular power spectrum of tempertature anisotropies produced by the halo rotation is below the fluctuations power associated with the thermal SZ and peculiar velocity kinetic SZ effects.

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