Next Article in Journal
What if Newton’s Gravitational Constant Was Negative?
Previous Article in Journal
Magnetic Fields Around Galactic Discs
Previous Article in Special Issue
Magnetic-Field Vector Maps of Nearby Spiral Galaxies
Article Menu
Issue 1 (March) cover image

Export Article

Open AccessArticle

Tracing Primordial Magnetic Fields with 21 cm Line Observations

Departamento de Física Fundamental, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, Spain
Galaxies 2019, 7(1), 37; https://doi.org/10.3390/galaxies7010037
Received: 23 October 2018 / Revised: 26 February 2019 / Accepted: 6 March 2019 / Published: 13 March 2019
(This article belongs to the Special Issue The Power of Faraday Tomography)
  |  
PDF [249 KB, uploaded 13 March 2019]
  |  

Abstract

Magnetic fields are observed on a large range of scales in the universe. Up until recently, the evidence always pointed to magnetic fields associated with some kind of structure, from planets to clusters of galaxies. Blazar observations have been used to posit the first evidence of truly cosmological magnetic fields or void magnetic fields. A cosmological magnetic field generated in the very early universe before recombination has implications for the cosmic microwave background (CMB), large scale structure as well as the 21 cm line signal. In particular, the Lorentz term causes a change in the linear matter power spectrum. Its implication on the 21 cm line signal was the focus of our recent simulations which will be summarised here. Modelling the cosmological magnetic field as a gaussian random field numerical solutions were found for magnetic fields with present day amplitudes of 5 nG and negative spectral indices which are within the range of observational constraints imposed by the cosmic microwave background (CMB). View Full-Text
Keywords: cosmological magnetic fields; 21 cm line observations; large scale structure cosmological magnetic fields; 21 cm line observations; large scale structure
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Kunze, K.E. Tracing Primordial Magnetic Fields with 21 cm Line Observations. Galaxies 2019, 7, 37.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Galaxies EISSN 2075-4434 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top