Journal Article

Sunyaev–Zel'dovich power spectrum produced by primordial magnetic fields

Hiroyuki Tashiro and Naoshi Sugiyama

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 2, pages 1284-1292
Published in print February 2011 | ISSN: 0035-8711
Published online February 2011 | e-ISSN: 1365-2966 | DOI:
Sunyaev–Zel'dovich power spectrum produced by primordial magnetic fields

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Primordial magnetic fields generated in the very early universe are one of the candidates for the origin of magnetic fields observed in galaxy clusters. After recombination, the Lorentz force acts on the residual ions and electrons to generate density fluctuations of baryons. Accordingly these fluctuations induce the early formation of dark haloes which cause the Sunyaev–Zel'dovich (S–Z) effect in cosmic microwave background radiation. This additional S–Z effect due to primordial magnetic fields amplifies the angular power spectrum of cosmic microwave temperature anisotropies on small scales. This amplification depends on the comoving amplitude and the power-law index of the primordial magnetic fields spectrum. Comparing with the small scale CMB observations, we obtained the constraints on the primordial magnetic fields, i.e. B≲ 2.0 nG for n=−2.9 or B≲ 1.0 nG for n=−2.6 where B is the comoving amplitude of magnetic fields at h− 1 Mpc and n is the power-law index. Future S–Z measurements have the potential to give constraints tighter than those from temperature anisotropies and polarization of cosmic microwave background induced by the magnetic fields at the recombination epoch.

Keywords: cosmic background radiation; cosmology: theory; large-scale structure of Universe

Journal Article.  4857 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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