Extracting host galaxy dispersion measure and constraining cosmological parameters using fast radio burst data
- Kavli Institute of Astronomy and Astrophysics, Peking University, Beijing 100871 (China)
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{sub HG}) in order to apply those methods. We introduce a slope parameter β(z)≡dln〈DM{sub E}〉/dlnz (where DM{sub 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 〈DM{sub HG}〉 can be roughly inferred from β and the mean values, (〈DM{sub E}〉)-bar and z-bar , of the sample. Through Monte Carlo simulations, we show that the mean value of local host galaxy DM, 〈DM{sub HG,loc}〉, along with other cosmological parameters (mass density Ω{sub m} in the ΛCDM model, and the IGM portion of the baryon energy density Ω{sub b}f{sub IGM}), can be independently measured through Markov Chain Monte Carlo fitting to the data.
- OSTI ID:
- 22868572
- Journal Information:
- Astrophysical Journal Letters, Vol. 830, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
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