2008/02/29 by Nan Liang, Wei Ke Xiao, Yuan Liu +2 · 180 citations
Physics and Astronomy · #Astrophysics #Cosmology #Cosmology and Gravitation Theories #Dark energy #Distance modulus #Galaxy #Gamma-ray burst #Gamma-ray bursts and supernovae #Hubble's law #Luminosity #Luminosity distance #Physics #Pulsars and Gravitational Waves Research #Redshift #Supernova #astro-ph
paper · pdf · doi:10.1086/590903
published in The Astrophysical Journal 685(1), 354-360 (IOP Publishing) · 7 pages, 3 figures, 1 table, now matches the editorially revised version; accepted for publication in ApJ (vol 685);
arxiv created 2008/09/10 · openalex publication_date 2008/09/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
An important concern in the application of gamma-ray bursts (GRBs) to cosmology is that the calibration of GRB luminosity/energy relations depends on the cosmological model, due to the lack of a sufficient low-redshift GRB sample. In this paper, we present a new method to calibrate GRB relations in a cosmology-independent way. Since objects at the same redshift should have the same luminosity distance, and since the distance moduli of Type Ia supernovae (SNe Ia) obtained directly from observations are completely cosmology independent, we obtain the distance modulus of a GRB at a given redshift by interpolating from the Hubble diagram of SNe Ia. Then we calibrate seven GRB relations without assuming a particular cosmological model and construct a GRB Hubble diagram to constrain cosmological parameters. From the 42 GRBs at 1.4 < z ⩽ 6.6, we obtain Ω M = 0.25 + 0.04 −0.05 , Ω Λ = 0.75 + 0.05 −0.04 for the flat ΛCDM model, and for the dark energy model with a constant equation of state w 0 = − 1.05 + 0.27 −0.40 , which is consistent with the concordance model in a 1 σ confidence region.