J/MNRAS/486/L46 Gamma-ray burst redshifts (Amati+, 2019)
Addressing the circularity problem in the Ep-Eiso correlation of
gamma-ray bursts.
Amati L., D'Agostino R., Luongo O., Muccino M., Tantalo M.
<Mon. Not. R. Astron. Soc., 486, L46-L51 (2019)>
=2019MNRAS.486L..46A 2019MNRAS.486L..46A (SIMBAD/NED BibCode)
ADC_Keywords: GRB ; Redshifts ; Optical
Keywords: cosmology: observations - dark energy - gamma-rays: general
Abstract:
We here propose a new model-independent technique to overcome the
circularity problem affecting the use of gamma-ray bursts (GRBs) as
distance indicators through the use of Ep-Eiso correlation. We
calibrate the Ep-Eiso correlation and find the GRB distance moduli
that can be used to constrain dark energy models. We use observational
Hubble data to approximate the cosmic evolution through Bezier
parametric curve obtained through the linear combination of Bernstein
basis polynomials. In doing so, we build up a new data set consisting
of 193 GRB distance moduli. We combine this sample with the supernova
JLA data set to test the standard ΛCDM model and its wCDM
extension. We place observational constraints on the cosmological
parameters through Markov Chain Monte Carlo numerical technique.
Moreover, we compare the theoretical scenarios by performing the
Akaike and Deviance Information statistical criteria.the 2σ
level, while for the wCDM model we obtain Ωm=0.34+0.13-0.15
and w=-0.86+0.36-0.38 at the 2σ level. Our analysis suggests
that ΛCDM model is statistically favoured over the wCDM
scenario. No evidence for extension of the ΛCDM model is found.
Description:
List of the full sample of GRBs used in this work and their redshift z
and calibrated µGRB.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 26 193 List of the full sample of GRBs used in this
work and their redshift z and calibrated muGRB
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- GRB GRB name, YYMMDDA
9- 15 F7.5 --- z Redshift
17- 21 F5.2 --- muGRB Distance modulus
23- 26 F4.2 --- e_muGRB Error on Distance modulus
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 20-Sep-2023