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.
<Astrophys. J., 908, 181 (2021)>
=2021ApJ...908..181M 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 (Ωm, ΩΛ) in
the framework of flat and non-flat ΛCDM 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
4.4σ, 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 Ωm since at z≲1.2 we see that w(z) agrees within
1σ 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 2σ and 4σ 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 78 174 List of the long bursts analyzed
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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
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Bytes Format Units Label Explanations
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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
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Note (1): GRB source list from
I15 = Izzo+, 2015A&A...582A.115I 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.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 23-Feb-2024