Journal Article

A simple empirically motivated template for the thermal Sunyaev–Zel’dovich effect

George Efstathiou and Marina Migliaccio

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 423, issue 3, pages 2492-2497
Published in print July 2012 | ISSN: 0035-8711
Published online June 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21059.x
A simple empirically motivated template for the thermal Sunyaev–Zel’dovich effect

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We develop a model for the power spectrum of unresolved clusters of galaxies arising from the thermal Sunyaev–Zel’dovich (tSZ) effect. The model is based on a ‘universal’ gas pressure profile constrained by X-ray observations and includes a parameter to describe departures from self-similar evolution. The model is consistent with recent Planck observations of the tSZ effect for X-ray clusters with redshifts z≲ 1 and reproduces the low amplitude for the tSZ inferred from recent ground-based observations. By adjusting two free parameters, we are able to reproduce the tSZ power spectra from recent numerical simulations to an accuracy that is well within theoretical uncertainties. Our model provides a simple, empirically motivated tSZ template that may be useful for the analysis of new experiments such as Planck.

Keywords: galaxies: clusters: intracluster medium; cosmic background radiation; cosmological parameters

Journal Article.  4121 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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