Cosmology-independent Estimate of the Fraction of Baryon Mass in the IGM from Fast Radio Burst Observations
Li, Zhengxiang1; Gao, He1; Wei, Jun-Jie2; Yang, Yuan-Pei3; Zhang, Bing4; Zhu, Zong-Hong1,5

The excessive dispersion measure (DM) of fast radio bursts (FRBs) has been proposed to be a powerful tool to study intergalactic medium (IGM) and to perform cosmography. One issue is that the fraction of baryons in the IGM, f(IGM), is not properly constrained. Here, we propose a method of estimating f(IGM) using a putative sample of FRBs with the measurements of both DM and luminosity distance d(L). The latter can be obtained if the FRB is associated with a distance indicator (e.g., a gamma-ray burst or a gravitational-wave event), or the redshift z of the FRB is measured and d(L) at the corresponding z is available from other distance indicators (e.g., SNe Ia) at the same redshift. As d(L)/DM essentially does not depend on cosmological parameters, our method can determine f(IGM) independent of cosmological parameters. We parameterize f(IGM) as a function of redshift and model the DM contribution from a host galaxy as a function of star formation rate. Assuming f(IGM) has a mild evolution with redshift with a functional form and by means of Monte Carlo simulations, we show that an unbiased and cosmology-independent estimate of the present value of f(IGM) with a similar to 12% uncertainty can be obtained with 50 joint measurements of d(L) and DM. In addition, such a method can also lead to a measurement of the mean value of DM contributed from the local host galaxy.

Keywordcosmology: observations intergalactic medium
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000468101500002
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorGao, He
Affiliation1.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210034, Jiangsu, Peoples R China
3.Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Yunnan, Peoples R China
4.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA
5.Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Li, Zhengxiang,Gao, He,Wei, Jun-Jie,et al. Cosmology-independent Estimate of the Fraction of Baryon Mass in the IGM from Fast Radio Burst Observations[J]. ASTROPHYSICAL JOURNAL,2019,876(2):6.
APA Li, Zhengxiang,Gao, He,Wei, Jun-Jie,Yang, Yuan-Pei,Zhang, Bing,&Zhu, Zong-Hong.(2019).Cosmology-independent Estimate of the Fraction of Baryon Mass in the IGM from Fast Radio Burst Observations.ASTROPHYSICAL JOURNAL,876(2),6.
MLA Li, Zhengxiang,et al."Cosmology-independent Estimate of the Fraction of Baryon Mass in the IGM from Fast Radio Burst Observations".ASTROPHYSICAL JOURNAL 876.2(2019):6.
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