J/ApJ/908/181 Dark energy history with 174 Gamma-ray bursts (Muccino+, 2021) ================================================================================ Tracing Dark Energy History with Gamma-Ray Bursts. Muccino M., Izzo L., Luongo O., Boshkayev K., Amati L., Della Valle M., Pisani G.B., Zaninoni E. =2021ApJ...908..181M ================================================================================ ADC_Keywords: GRB; X-ray sources; Redshifts Keywords: Standard candles ; Dark energy ; Gamma-ray bursts Abstract: Observations of gamma-ray bursts up to z~9 are best suited to study the possible evolution of the universe equation of state at intermediate redshifts. We apply the Combo relation to a sample of 174 gamma-ray bursts to investigate possible evidence of evolving dark energy parameter w(z). We first build a gamma-ray burst Hubble's diagram and then we estimate the set ({Omega}m, {Omega}{Lambda}) in the framework of flat and non-flat {Lambda}CDM paradigm. We then get bounds over the wCDM model, where w is thought to evolve with redshift, adopting two priors over the Hubble constant in tension at 4.4{sigma}, i.e., H0=(67.4{+/-}0.5)km/s/Mpc and H0=(74.03{+/-}1.42)km/s/Mpc. We show our new sample provides tighter constraints on {Omega}m since at z<~1.2 we see that w(z) agrees within 1{sigma} with the standard value w=-1. The situation is the opposite at larger z, where gamma-ray bursts better fix w(z) that seems to deviate from w=-1 at 2{sigma} and 4{sigma} level, depending on the redshift bins. In particular, we investigate the w(z) evolution through a piecewise formulation over seven redshift intervals. From our fitting procedure we show that at z>~1.2 the case w<-1 cannot be fully excluded, indicating that dark energy's influence is not negligible at larger z. We confirm the Combo relation as a powerful tool to investigate cosmological evolution of dark energy. Future space missions will significantly enrich the gamma-ray burst database even at smaller redshifts, improving de facto the results discussed in this paper. Description: In this work, adopting an extended GRB sample, characterized by a complete data set in gamma- and X-rays, we fix limits over DE's evolution. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table4.dat 78 174 List of the long bursts analyzed -------------------------------------------------------------------------------- See also: J/ApJ/612/652 : Dimensionless coordinate distance to supernovae (Daly+, 2004) J/ApJ/716/712 : HST light curves of six SNe and Union2 (Amanullah+, 2010) J/ApJ/746/85 : THe HST Cluster Supernova Survey. V. (Suzuki+, 2012) J/MNRAS/428/729 : GRB Swift X-ray light curves analysis (Margutti+, 2013) J/MNRAS/486/L46 : Gamma-ray burst redshifts (Amati+, 2019) J/ApJ/876/85 : HST observations for LMC Cepheids (Riess+, 2019) Byte-by-byte Description of file: table4.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 A3 --- List Source reference list (1) 5- 11 A7 --- GRB Gamma-ray burst number 13- 18 F6.4 --- z [0.03/9.4] Literature redshift 20- 20 A1 --- Subsam Redshift sub-sample (2) 22- 25 F4.2 [keV] logEpi [1.17/3.31] log, rest-frame peak energy, keV 27- 30 F4.2 [keV] E_logEpi [0.01/0.66] Upper uncertainty on logEpi 32- 35 F4.2 [keV] e_logEpi [0.01/0.64] Lower uncertainty on logEpi 37- 42 F6.2 [mW/m2] logF0 [-12.35/-6.13] log, rest-frame 0.3-10 keV energy flux, erg/s/cm2 44- 47 F4.2 [mW/m2] E_logF0 [0.01/0.26] Upper uncertainty on logF0 49- 52 F4.2 [mW/m2] e_logF0 [0.01/0.77] Lower uncertainty on logF0 54- 57 F4.2 [s] logtau [1.22/5.3] log, rest-frame duration, seconds 59- 62 F4.2 [s] E_logtau [0.01/0.3] Upper uncertainty on logtau 64- 67 F4.2 [s] e_logtau [0.01/1.86] Lower uncertainty on logtau 69- 73 F5.2 --- alpha [-6.02/-1.0] late power-law decay index 75- 78 F4.2 --- e_alpha [0.01/1.79] Uncertainty on alpha -------------------------------------------------------------------------------- Note (1): GRB source list from I15 = Izzo+, 2015A&A...582A.115I TW = this work. Note (2): Redshift sub-samples used in fitting -- a = 0.54; b = 1.18; c = 1.46; d = 1.70; e = 2.05; f = 2.27; g = 2.69. -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Prepared by [AAS], Coralie Fix [CDS], 23-Feb-2024