中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
The Scattering of FRBs by the Intergalactic Medium: Variations, Strength, and Dependence on Dispersion Measures

文献类型:期刊论文

作者Zhu, Weishan1; Feng, Long-Long1,2; Zhang, Fupeng1
刊名ASTROPHYSICAL JOURNAL
出版日期2018-10-01
卷号865期号:2页码:9
ISSN号0004-637X
关键词intergalactic medium radio continuum: general turbulence
DOI10.3847/1538-4357/aadbb0
英文摘要

The scattering of fast radio bursts (FRBs) by the intergalactic medium (IGM) is explored using cosmological hydrodynamical simulations. We confirm that the scattering by the clumpy IGM has significant line-of-sight variations. We demonstrate that the scattering by the IGM in the voids and walls of the cosmic web is weak, but it can be significantly enhanced by the gas in clusters and filaments. The observed nonmonotonic dependence of the FRB widths on the dispersion measures (DM) cannot determine whether the IGM is an important scattering matter or not. The IGM may dominate the scattering of some FRBs, and the host galaxy dominates others. For the former case, the scattering should be primarily caused by the medium in clusters. A mock sample of 500 sources shows that tau(IGM) alpha DMIGM (1.6-2.1) at z < 1.5. Assuming that the turbulence follows Kolmogorov scaling, we find that an outer scale of L0 similar to 5 pc is required to make tau(IGM) 1-10 ms at nu = 1 GHz. The required L-0 similar to 5 pc can alleviate the tension in the timescales of turbulent heating and cooling but is still similar to 4 orders of magnitude lower than the presumed injection scale of turbulence in the IGM. The gap is expected to be effectively shortened if the simulation resolution is further increased. The mechanisms that may further reduce the gap are shortly discussed. If future observations can justify the role of the IGM in the broadening of FRBs, it can help to probe the gas in clusters and filaments.

WOS关键词FAST RADIO-BURSTS ; GAS-DENSITY FLUCTUATIONS ; LARGE-SCALE STRUCTURE ; REIONIZATION HISTORY ; COSMIC WEB ; TURBULENCE ; SIMULATIONS ; ENVIRONMENT ; VORTICITY ; UNIVERSE
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000446350500007
源URL[http://libir.pmo.ac.cn/handle/332002/21202]  
专题中国科学院紫金山天文台
通讯作者Zhu, Weishan
作者单位1.Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
推荐引用方式
GB/T 7714
Zhu, Weishan,Feng, Long-Long,Zhang, Fupeng. The Scattering of FRBs by the Intergalactic Medium: Variations, Strength, and Dependence on Dispersion Measures[J]. ASTROPHYSICAL JOURNAL,2018,865(2):9.
APA Zhu, Weishan,Feng, Long-Long,&Zhang, Fupeng.(2018).The Scattering of FRBs by the Intergalactic Medium: Variations, Strength, and Dependence on Dispersion Measures.ASTROPHYSICAL JOURNAL,865(2),9.
MLA Zhu, Weishan,et al."The Scattering of FRBs by the Intergalactic Medium: Variations, Strength, and Dependence on Dispersion Measures".ASTROPHYSICAL JOURNAL 865.2(2018):9.

入库方式: OAI收割

来源:紫金山天文台

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