Large Host-galaxy Dispersion Measure of Fast Radio Bursts

被引：31

作者：

Yang, Yuan-Pei ^{[1
]}

Luo, Rui ^{[1
,2
]}

Li, Zhuo ^{[1
,2
]}

Zhang, Bing ^{[1
,2
,3
]}

机构：

[1] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China

[2] Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China

[3] Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2017年 / 839卷 / 02期

基金：

中国博士后科学基金;

关键词：

intergalactic medium; radio continuum: general; SUPERNOVA REMNANT; AFTERGLOWS; BARYONS; ORIGIN; IMPACT; PULSES;

D O I：

10.3847/2041-8213/aa6c2e

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Fast radio bursts (FRBs) have excessive dispersion measures (DMs) and an all-sky distribution, which point toward an extragalactic or even a cosmological origin. We develop a method to extract the mean host galaxy DM (DMHG, loc) and the characterized luminosity (L) of FRBs using the observed DM-flux data, based on the assumption of a narrow luminosity distribution. Applying Bayesian inference to the data of 21 FRBs, we derive a relatively large mean host DM, i. e., <DMHG, loc> similar to 270 pc cm(-3) with a large dispersion. A relatively large DMHG of FRBs is also supported by the millisecond scattering times of some FRBs and the relatively small redshift z. =. 0.19273 of FRB 121102 (which gives DMHG, loc similar to 210 pc cm(-3)). The large host galaxy DM may be contributed by the interstellar medium (ISM) or a near-source plasma in the host galaxy. If it is contributed by the ISM, the type of the FRB host galaxies would not be Milky Way-like, consistent with the detected host of FRB 121102. We also discuss the possibility of having a near-source supernova remnant, pulsar wind nebula, or H II region that gives a significant contribution to the observed DMHG.

引用

页数：5

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