TY - JOUR

T1 - Modeling integrated properties and the polarization of the Sunyaev-Zeldovich effect

AU - Rephaeli, Y.

AU - Sadeh, S.

AU - Shimon, M.

N1 - Funding Information:
Work at Tel Aviv University was supported by Israel Science Foundation Grant 225/03.

PY - 2007/3

Y1 - 2007/3

N2 - Two little explored aspects of Compton scattering of the CMB in clusters are discussed: the statistical properties of the Sunyaev-Zeldovich (S-Z) effect in the context of a non-Gaussian density fluctuation field, and the polarization patterns in a hydrodynamically-simulated cluster. We have calculated and compared the power spectrum and cluster number counts predicted within the framework of two density fields that yield different cluster mass functions at high redshifts. This is done for the usual Press and Schechter mass function, which is based on a Gaussian density fluctuation field, and for a mass function based on a χ2-distributed density field. We quantify the significant differences in the respective integrated S-Z observables in these two models. S-Z polarization levels and patterns strongly depend on the non-uniform distributions of intracluster gas and on peculiar and internal velocities. We have therefore calculated the patterns of two polarization components that are produced when the CMB is doubly scattered in a simulated cluster. These are found to be very different than the patterns calculated based on spherical clusters with uniform structure and simplified gas distribution.

AB - Two little explored aspects of Compton scattering of the CMB in clusters are discussed: the statistical properties of the Sunyaev-Zeldovich (S-Z) effect in the context of a non-Gaussian density fluctuation field, and the polarization patterns in a hydrodynamically-simulated cluster. We have calculated and compared the power spectrum and cluster number counts predicted within the framework of two density fields that yield different cluster mass functions at high redshifts. This is done for the usual Press and Schechter mass function, which is based on a Gaussian density fluctuation field, and for a mass function based on a χ2-distributed density field. We quantify the significant differences in the respective integrated S-Z observables in these two models. S-Z polarization levels and patterns strongly depend on the non-uniform distributions of intracluster gas and on peculiar and internal velocities. We have therefore calculated the patterns of two polarization components that are produced when the CMB is doubly scattered in a simulated cluster. These are found to be very different than the patterns calculated based on spherical clusters with uniform structure and simplified gas distribution.

KW - Clusters of galaxies

KW - Cosmic microwave background

KW - Large-scale structure

UR - http://www.scopus.com/inward/record.url?scp=33846931352&partnerID=8YFLogxK

U2 - 10.1016/j.newar.2006.11.038

DO - 10.1016/j.newar.2006.11.038

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AN - SCOPUS:33846931352

SN - 1387-6473

VL - 51

SP - 350

EP - 362

JO - New Astronomy Reviews

JF - New Astronomy Reviews

IS - 3-4

ER -