A new method of measuring the cluster peculiar velocity power spectrum

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...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2008-08, Vol.388 (2), p.884-888
Main Authors: Zhang, Pengjie, Feldman, Hume A., Juszkiewicz, Roman, Stebbins, Albert
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics
cosmic microwave background
cosmology: observations
cosmology: theory
dark matter
distance scale
Earth, ocean, space
Exact sciences and technology
Kinetics
large-scale structure of Universe
Spectrum analysis
Velocity
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Summary: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.
ISSN:0035-8711
1365-2966
DOI:10.1111/j.1365-2966.2008.13454.x