Journal Article

Primordial magnetic fields with X-ray and Sunyaev-Zel'divich cluster surveys

Hiroyuki Tashiro, Keitaro Takahashi and Kiyotomo Ichiki

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 424, issue 2, pages 927-932
Published in print August 2012 | ISSN: 0035-8711
Published online August 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21239.x
Primordial magnetic fields with X-ray and Sunyaev-Zel'divich cluster surveys

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Abstract

The effect of primordial magnetic fields on X-ray and Sunyaev-Zel'divich (S-Z) galaxy cluster surveys is investigated. After the recombination epoch, primordial magnetic fields generated density fluctuations, and such density fluctuations enhanced the number of galaxy clusters. Taking into account the density fluctuations generated by these primordial magnetic fields, we calculated the expected number of galaxy clusters based on the Press-Schechter formalism. By comparing the results with observations from the Chandra X-ray galaxy cluster survey, we found that the amplitude of the primordial magnetic fields cannot have been larger than 10 nG. Moreover, we show that S-Z cluster surveys are also sensitive enough to constrain the amplitude of primordial magnetic fields. In particular, the SPT S-Z cluster survey can constrain the amplitude to several nano-gauss.

Keywords: galaxies: abundances; cosmic background radiation; large-scale structure of Universe; X-rays: galaxies: clusters

Journal Article.  3872 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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