Extracting host galaxy dispersion measure and constraining cosmological parameters using fast radio burst data

Abstract

The excessive dispersion measures (DMs) and high Galactic latitudes of fast radio bursts (FRBs) hint toward a cosmological origin of these mysterious transients. Methods of using measured DM and redshift $z$ to study cosmology have been proposed, but one needs to assume a certain amount of DM contribution from the host galaxy (DM${}_{\mathrm{HG}}$) in order to apply those methods. We introduce a slope parameter $\beta (z)\equiv d\ln ⟨{\mathrm{DM}}_{\mathrm{E}}⟩/d\ln z$ (where DM${}_{\mathrm{E}}$ is the observed DM subtracting the Galactic contribution), which can be directly measured when a sample of FRBs have $z$ measured. We show that $⟨\mathrm{D}{\mathrm{M}}_{\mathrm{HG}}⟩$ can be roughly inferred from $\beta$ and the mean values, $\overline{⟨\mathrm{D}{\mathrm{M}}_{\mathrm{E}}⟩}$ and $\bar{z}$, of the sample. Through Monte Carlo simulations, we show that the mean value of local host galaxy DM, $⟨\mathrm{D}{\mathrm{M}}_{\mathrm{HG},\mathrm{loc}}⟩$, along with other cosmological parameters (mass density ${\Omega }_m$ in the $\Lambda$CDM model, and the IGM portion of the baryon energy density ${\Omega }_b{f}_{\mathrm{IGM}}$) can be independently measured through MCMC fitting to the data.

7 pages, 5 figures, Accepted for publication in ApJL

References in corpus (5)

• A bright millisecond radio burst of extragalactic origin
• Fast Radio Burst Discovered in the Arecibo Pulsar ALFA Survey
• A fast radio burst in the direction of the Carina dwarf spheroidal galaxy
• The Galactic Position Dependence of Fast Radio Bursts and the Discovery of FRB 011025
• Multi-wavelength afterglows of fast radio bursts

Cited by in corpus (17)

• Fast Radio Bursts
• The Physics of Fast Radio Bursts
• The prevalence of repeating fast radio bursts
• Fast Radio Bursts and cosmological tests
• Dispersion Measure Variation of Repeating Fast Radio Burst Sources
• Cosmology-independent estimate of the fraction of baryon mass in the IGM from fast radio burst observations
• Cosmology-insensitive estimate of IGM baryon mass fraction from five localized fast radio bursts
• Measuring the cosmic proper distance from fast radio bursts
• A New Method to Measure Hubble Parameter $H(z)$ using Fast Radio Bursts
• A Fast Radio Burst discovered in FAST drift scan survey
• H$\alpha$ intensity map of the repeating fast radio burst FRB 121102 host galaxy from Subaru/Kyoto 3DII AO-assisted optical integral-field spectroscopy
• The dispersion measure and scattering of FRBs: Contributions from the intergalactic medium, foreground halos, and hosts
• The effects of plasma lensing on the inferred dispersion measures of Fast Radio Bursts
• Detection of a Low-frequency Cosmic Radio Transient Using Two LWA Stations
• The fate of bound systems through Sudden Future Singularities
• One-off and Repeating Fast Radio Bursts: A Statistical Analysis
• The variance of dispersion measure of high-redshift transient objects as a probe of ionized bubble size during reionization