Kinetic Sunyaev-zel’dovich Effect from Halo Rotation
نویسندگان
چکیده
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 M , this rotational scattering effect produces a distinct dipole-like temperature distribution with a peak fluctuation of the order a few μK, 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. Subject headings: cosmology: theory — cosmic microwave background — large scale structure of universe
منابع مشابه
Detecting Sunyaev-Zel’dovich clusters with Planck: I. Construction of all-sky thermal and kinetic SZ-maps
All-sky thermal and kinetic Sunyaev-Zel’dovich (SZ) maps are presented for assessing how well the Planck mission can find and characterise clusters of galaxies, especially in the presence of primary anisotropies of the cosmic microwave background (CMB) and various galactic and ecliptic foregrounds. The maps have been constructed from numerical simulations of structure formation in a standard ΛC...
متن کاملReconstructing Three-dimensional Structure of Underlying Triaxial Dark Halos From X-ray and Sunyaev–Zel’dovich Effect Observations of Galaxy Clusters
While the use of galaxy clusters as tools to probe cosmology is established, their conventional description still relies on the spherical and/or isothermal models that were proposed more than 20 years ago. We present, instead, a deprojection method to extract their intrinsic properties from X-ray and Sunyaev– Zel’dovich effect observations in order to improve our understanding of cluster physic...
متن کاملHydrodynamical simulations of the Sunyaev–Zel’dovich effect: the kinetic effect
We use hydrodynamical N -body simulations to study the kinetic Sunyaev–Zel’dovich effect. We construct sets of maps, one square degree in size, in three different cosmological models. We confirm earlier calculations that on the scales studied the kinetic effect is much smaller than the thermal (except close to the thermal null point), with an rms dispersion smaller by about a factor five in the...
متن کاملObserving the Sunyaev-Zel’dovich Effect Closer to Home
Hot gas trapped in a dark matter halo will produce a decrement in the surface brightness of the microwave background, the Sunyaev-Zel’dovich (SZ) effect. While massive clusters produce the strongest central SZ decrements, we point out that a local galaxy halo, specifically the halo of M31, may be one of the brightest integrated SZ sources in the sky. For various realistic gas distributions cons...
متن کاملModelling the correlation between the thermal Sunyaev Zel’dovich effect and the cosmic infrared background
We show how the correlation between the thermal Sunyaev Zel’dovich effect (tSZ) from galaxy clusters and dust emission from cosmic infrared background (CIB) sources can be calculated in a halo model framework. Using recent tSZ and CIB models, we find that the size of the tSZ×CIB cross-correlation is approximately 20 per cent at 150 GHz. The contribution to the total angular power spectrum is ar...
متن کامل