Constraints on the SZ Power Spectrum on Degree Angular Scales in WMAP Data

Details Constraints on the SZ Power Spectrum on Degree Angular Scales in WMAP Data Constraints on the SZ Power Spectrum on Degree Angular Scales in WMAP Data

2010-02-26

arxiv.org/abs/1002.4872v4

JCAP08(2010)027

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

14 pages, 3 figures, 2 tables. Simple typos fixed

Scientific paper

10.1088/1475-7516/2010/08/027

The Sunyaev-Zel'dovich (SZ) effect has a distinct spectral signature that allows its separation from fluctuations in the cosmic microwave background (CMB) and foregrounds. Using CMB anisotropies measured in Wilkinson Microwave Anisotropy Probe's five-year maps, we constrain the SZ fluctuations at large, degree angular scales corresponding to multipoles in the range from 10 to 400. We provide upper bounds on SZ fluctuations at multipoles greater than 50, and find evidence for a hemispherically asymmetric signal at ten degrees angular scales. The amplitude of the detected signal cannot be easily explained with the allowed number density and temperature of electrons in the Galactic halo. We have failed to explain the excess signal as a residual from known Galactic foregrounds or instrumental uncertainties such as 1/f-noise.

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