Cosmology-independent Estimate of the Fraction of Baryon Mass in the IGM from Fast Radio Burst Observations
文献类型：期刊论文
| 作者 | Li, Zhengxiang1; Gao, He1; Wei, Jun-Jie2; Yang, Yuan-Pei3; Zhang, Bing4; Zhu, Zong-Hong1,5 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2019-05-10 |
| 卷号 | 876期号:2页码:6 |
| 关键词 | cosmology: observations intergalactic medium |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab18fe |
| 通讯作者 | Gao, He(gaohe@bnu.edu.cn) |
| 英文摘要 | 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. |
| WOS关键词 | REIONIZATION HISTORY ; REDSHIFT |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000468101500002 |
| 出版者 | IOP PUBLISHING LTD |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/26668]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Gao, He |
| 作者单位 | 1.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 |
| 推荐引用方式 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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来源：紫金山天文台
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