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A new method of measuring the cluster peculiar velocity power spectrum |
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| Authors: | Pengjie Zhang Hume A. Feldman Roman Juszkiewicz Albert Stebbins |
| Affiliation: | Shanghai Observatory, Chinese Academy of Science, 200030 Shanghai, China;NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, IL 60510-0500, USA;Department of Physics &Astronomy, University of Kansas, Lawrence, KS 66045, USA;Institute of Astronomy, Zielona Góra University, 65-516 Zielona Góra, Poland;Copernicus Astronomical Center, 00-716 Warsaw, Poland |
| Abstract: | We propose to use spatial correlations of the kinetic Sunyaev–Zeldovich (KSZ) flux as an estimator of the peculiar velocity power spectrum. In contrast with conventional techniques, our new method does not require measurements of the thermal SZ signal or the X-ray temperature. Moreover, this method has the special advantage that the expected systematic errors are always subdominant to statistical errors on all scales and redshifts of interest. We show that future large sky coverage KSZ surveys may allow a peculiar velocity power spectrum estimates of an accuracy reaching ∼10 per cent. |
| Keywords: | cosmic microwave background cosmology: observations cosmology: theory dark matter distance scale large-scale structure of Universe |