Luminosity–duration relation of fast radio bursts. Issue 2 (21st June 2019)

• Record Type: Journal Article
• Authors: Hashimoto, Tetsuya; Goto, Tomotsugu; Wang, Ting-Wen; Kim, Seong Jin; Wu, Yi-Han; Ho, Chien-Chang
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 488:Issue 2(2019)
• Page Start: 1908
• Page End: 1916
• Publication Date: 2019-06-21
• Subjects: cosmological parameters -- dark energy -- distance scale -- radio continuum: transients; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stz1715
• Languages: English
• ISSNs: 0035-8711

Abstract

Abstract: Nature of dark energy remains unknown. Especially, to constrain the time variability of the dark energy, a new, standardizable candle that can reach more distant Universe has been awaited. Here we propose a new distance measure using fast radio bursts (FRBs), which are a new emerging population of ∼ ms time-scale radio bursts that can reach high- z in quantity. We show an empirical positive correlation between the time-integrated luminosity ( L ν ) and rest-frame intrinsic duration ( w int, rest ) of FRBs. The L ν − w int, rest correlation is with a weak strength but statistically very significant, i.e. Pearson coefficient is ∼ 0.5 with P value of ∼0.038, despite the smallness of the current sample. This correlation can be used to measure intrinsic luminosity of FRBs from the observed w int, rest . By comparing the luminosity with observed flux, we measure luminosity distances to FRBs, and thereby construct the Hubble diagram. This FRB cosmology with the L ν − w int, rest relation has several advantages over SNe Ia, Gamma-Ray Burst (GRB), and well-known FRB dispersion measure (DM)- z cosmology; (i) access to higher redshift Universe beyond the SNe Ia, (ii) high event rate that is ∼3 orders of magnitude more frequent than GRBs, and (iii) it is free from the uncertainty from intergalactic electron density models, i.e. we can remove the largest uncertainty in the well-debated DM- z cosmology of FRB. Our simulation suggests that the L ν − w int, rest relation provides us with useful constraints on the time variability of the dark energy when the next-generation radio telescopes start to find FRBs in quantity.