Insight into primordial magnetic fields from 21-cm line observation with EDGES experiment
Insight into primordial magnetic fields from 21-cm line observation with EDGES experiment
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DOI：
10.1093/mnras/stz1860
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发表时间：
2018-12
影响因子：
4.8
通讯作者：
Teppei Minoda;H. Tashiro;Tomo Takahashi
中科院分区：
文献类型：
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作者：
Teppei Minoda;H. Tashiro;Tomo Takahashi
EDGES最近对21厘米全球吸收信号的观测表明，在15赫兹至20赫兹期间，星系际介质（IGM）气体比宇宙微波背景冷。这一结果可以提供一个强有力的约束在这些红移的IGM气体的热源。本文利用EDGES结果研究了原始磁场的约束问题。由于磁流体动力学效应，PMF可以通过其能量耗散来加热IGM气体。通过数值求解IGM气体与PMF的热演化，我们发现EDGES结果给出了PMF的严格限制，即B1 Mpc = 10−10 G。
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.