Journal Article

A high-frequency study of the Sunyaev–Zel’dovich effect morphology in galaxy clusters

D. A. Prokhorov, S. Colafrancesco, T. Akahori, E. T. Million, S. Nagataki and K. Yoshikawa

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 416, issue 1, pages 302-310
Published in print September 2011 | ISSN: 0035-8711
Published online August 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19037.x
A high-frequency study of the Sunyaev–Zel’dovich effect morphology in galaxy clusters

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High-frequency, high-resolution imaging of the Sunyaev–Zel’dovich (SZ) effect is an important technique to study the complex structures of the atmospheres of merging galaxy clusters. Such observations are sensitive to the details of the electron spectrum. We show that the morphology of the SZ intensity maps in simulated galaxy clusters observed at 345, 600 and 857 GHz are significantly different because of SZ relativistic corrections. These differences can be revealed by high-resolution imaging instruments.

We calculate relativistically corrected SZ intensity maps of a simulated, massive, merging galaxy cluster and of the massive, merging clusters 1E0657−558 (the Bullet cluster) and Abell 2219. The morphologies of the SZ intensity maps are remarkably different between 345 and 857 GHz for each merging cluster. We show that high-resolution imaging observations of the SZ intensity maps at these frequencies, obtainable with the LABOCA and HERSCHEL-SPIRE instruments, allow to fully exploit the astrophysical relevance of the predicted SZ morphological effect.

Keywords: galaxies: cluster: general; cosmic background radiation

Journal Article.  6899 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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