Large host-galaxy dispersion measure of fast radio bursts

Abstract

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 ($⟨\mathrm{D}{\mathrm{M}}_{\mathrm{HG},\mathrm{loc}}⟩$) 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. $⟨\mathrm{D}{\mathrm{M}}_{\mathrm{HG},\mathrm{loc}}⟩\sim 270\mathrm{pc}\mathrm{c}{\mathrm{m}}^{-3}$ with a large dispersion. A relatively large $\mathrm{D}{\mathrm{M}}_{\mathrm{HG}}$ 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 $\mathrm{D}{\mathrm{M}}_{\mathrm{HG},\mathrm{loc}}\sim 210\mathrm{pc}\mathrm{c}{\mathrm{m}}^{-3}$). The large host galaxy DM may be contributed by the 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 (MW)-like, consistent with the detected host of FRB 121102. We also discuss the possibility of having a near-source supernova remnant (SNR), pulsar wind nebula (PWN) or HII region that gives a significant contribution to the observed $\mathrm{D}{\mathrm{M}}_{\mathrm{HG}}$.

6 pages, 1 figure. Upgrade with 21 FRBs. Accepted for publication in ApJL

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