A measurement of Hubble's Constant using Fast Radio Bursts
| Autor: | C W James, E M Ghosh, J X Prochaska, K W Bannister, S Bhandari, C K Day, A T Deller, M Glowacki, A C Gordon, K E Heintz, L Marnoch, S D Ryder, D R Scott, R M Shannon, N Tejos |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Cosmology and Nongalactic Astrophysics (astro-ph.CO) REDSHIFT UNIVERSE CONSTRAINTS TRANSIENTS FOS: Physical sciences Astronomy and Astrophysics fast radio bursts FRB 121102 HOST GALAXY DISPERSION Space and Planetary Science DISTRIBUTIONS EVENT RATE COUNTS cosmological parameters Astrophysics - High Energy Astrophysical Phenomena EMISSION Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | James, C W, Ghosh, E M, Prochaska, J X, Bannister, K W, Bhandari, S, Day, C K, Deller, A T, Glowacki, M, Gordon, A C, Heintz, K E, Marnoch, L, Ryder, S D, Scott, D R, Shannon, R M & Tejos, N 2022, ' A measurement of Hubble's Constant using Fast Radio Bursts ', Monthly Notices of the Royal Astronomical Society, vol. 516, no. 4, pp. 4862-4881 . https://doi.org/10.1093/mnras/stac2524 |
| DOI: | 10.48550/arxiv.2208.00819 |
| Popis: | We constrain the Hubble constant H$_0$ using Fast Radio Burst (FRB) observations from the Australian Square Kilometre Array Pathfinder (ASKAP) and Murriyang (Parkes) radio telescopes. We use the redshift-dispersion measure (`Macquart') relationship, accounting for the intrinsic luminosity function, cosmological gas distribution, population evolution, host galaxy contributions to the dispersion measure (DM$_{\rm host}$), and observational biases due to burst duration and telescope beamshape. Using an updated sample of 16 ASKAP FRBs detected by the Commensal Real-time ASKAP Fast Transients (CRAFT) Survey and localised to their host galaxies, and 60 unlocalised FRBs from Parkes and ASKAP, our best-fitting value of H$_0$ is calculated to be $73_{-8}^{+12}$ km s$^{-1}$ Mpc$^{-1}$. Uncertainties in FRB energetics and DM$_{\rm host}$ produce larger uncertainties in the inferred value of H$_0$ compared to previous FRB-based estimates. Using a prior on H$_0$ covering the 67--74 km s$^{-1}$ Mpc$^{-1}$ range, we estimate a median DM$_{\rm host} = 186_{-48}^{+59}$ km s$^{-1}$ Mpc$^{-1}$, exceeding previous estimates. We confirm that the FRB population evolves with redshift similarly to the star-formation rate. We use a Schechter luminosity function to constrain the maximum FRB energy to be $\log_{10} E_{\rm max}=41.26_{-0.22}^{+0.27}$ erg assuming a characteristic FRB emission bandwidth of 1 GHz at 1.3 GHz, and the cumulative luminosity index to be $\gamma=-0.95_{-0.15}^{+0.18}$. We demonstrate with a sample of 100 mock FRBs that H$_0$ can be measured with an uncertainty of $\pm 2.5$ km s$^{-1}$ Mpc$^{-1}$, demonstrating the potential for clarifying the Hubble tension with an upgraded ASKAP FRB search system. Last, we explore a range of sample and selection biases that affect FRB analyses. Comment: 21 pages, 19 figures, 6 tables, accepted by MNRAS, updated Table 5 and Figure 5 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|