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Thermal Sunyaev–Zel’dovich Effect in the IGM due to Primordial Magnetic Fields

by Teppei Minoda 1,*,†, Kenji Hasegawa 1,†, Hiroyuki Tashiro 1,†, Kiyotomo Ichiki 1,2,† and Naoshi Sugiyama 1,2,3,†
1
Department of Physics and Astrophysics, Nagoya University, Nagoya 464-8602, Japan
2
Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
3
Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), The University of Tokyo, Chiba 277-8582, Japan
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Galaxies 2018, 6(4), 143; https://doi.org/10.3390/galaxies6040143
Received: 31 October 2018 / Revised: 9 December 2018 / Accepted: 14 December 2018 / Published: 18 December 2018
(This article belongs to the Special Issue The Power of Faraday Tomography)
In the present universe, magnetic fields exist with various strengths and on various scales. One possible origin of these cosmic magnetic fields is the primordial magnetic fields (PMFs) generated in the early universe. PMFs are considered to contribute to matter density evolution via Lorentz force and the thermal history of intergalactic medium (IGM) gas due to ambipolar diffusion. Therefore, information about PMFs should be included in the temperature anisotropy of the Cosmic Microwave Background through the thermal Sunyaev–Zel’dovich (tSZ) effect in IGM. In this article, given an initial power spectrum of PMFs, we show the spatial fluctuation of mass density and temperature of the IGM and tSZ angular power spectrum created by the PMFs. Finally, we find that the tSZ angular power spectrum induced by PMFs becomes significant on small scales, even with PMFs below the observational upper limit. Therefore, we conclude that the measurement of tSZ anisotropy on small scales will provide the most stringent constraint on PMFs. View Full-Text
Keywords: magnetic fields; large-scale structure; magnetic turbulence magnetic fields; large-scale structure; magnetic turbulence
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Minoda, T.; Hasegawa, K.; Tashiro, H.; Ichiki, K.; Sugiyama, N. Thermal Sunyaev–Zel’dovich Effect in the IGM due to Primordial Magnetic Fields. Galaxies 2018, 6, 143.

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