Year: 2019
Type: article
Abstract: The recent observation of the 21-cm global absorption signal by EDGES suggests that the intergalactic medium (IGM) gas has been cooler than the cosmic microwave background during 15 ≲ z ≲ 20. This result can provide a strong constraint on heating sources for the IGM gas at these redshifts. In this paper we study the constraint on the primordial magnetic fields (PMFs) by the EDGES result. The PMFs can heat the IGM gas through their energy dissipation due to the magnetohydrodynamic effects. By numerically solving the thermal evolution of the IGM gas with the PMFs, we find that the EDGES result gives a stringent limit on the PMFs as B1 Mpc ≲ 10−10 G.
Institutions: Nagoya University, Saga University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G2222381074, G2918517084, New Developments in Research on Cosmic Reionization and Cosmic Magnetic Fields by Long Wave Length Radio Observations, New astrophysical researches by future 21cm line observations, Exploring the early Universe from the perspective of the next generation of precision cosmology, 磁場の存在を考慮した宇宙論的な構造形成の理論構築
OpenAlex ID: W2961798288