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Spectral Analysis of Fermi-LAT Gamma-Ray Bursts with Known Redshift and their Potential Use as Cosmological Standard Candles
Univ Johannesburg, Dept Phys, POB 524, ZA-2006 Auckland Pk, South Africa..
Univ Johannesburg, Dept Phys, POB 524, ZA-2006 Auckland Pk, South Africa..
Univ Montpellier, CNRS IN2P3, Lab Univers & Particules Montpellier, F-34095 Montpellier, France..
Kanazawa Univ, Fac Math & Phys, Inst Sci & Engn, Kanazawa, Ishikawa 9201192, Japan..
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2019 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 887, no 1, article id 13Article in journal (Refereed) Published
Abstract [en]

Long duration gamma-ray bursts may serve as standard candles to constrain cosmological parameters by probing the Hubble diagram well beyond the range of redshift currently accessible using SNe Ia. The standardization of gamma-ray bursts (GRBs) is based on phenomenological relations between two or more parameters found from spectral modeling, one of which is strongly dependent on the cosmological model. The Amati relation links the source-frame energy E-i,E-p at which the prompt gamma-ray spectral energy distribution nu F-nu peaks, and the isotropic-equivalent bolometric energy E-iso emitted during the prompt phase. We performed spectral analysis of 26 GRBs with known redshift that have been detected by the Fermi-Large Area Telescope (LAT) during its nine years of operations from 2008 July to 2017 September, thus extending the computation of E-iso to the 100 MeV range. Multiple components are required to fit the spectra of a number of GRBs. We found that the Amati relation is satisfied by the 25 LGRBs, with best-fit parameters similar to previous studies that used data from different satellite experiments, while the only short GRB with known redshift is an outlier. Using the Amati relation, we extend the Hubble diagram to redshift 4.35 and constrain the Hubble constant and dark-energy density in the Lambda CDM model, with Fermi-LAT GRBs alone and together with another sample of 94 GRBs and with the latest Supernovae type-Ia data. Our results are consistent with the currently acceptable ranges of those cosmological parameters within errors.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 887, no 1, article id 13
National Category
Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:kth:diva-266927DOI: 10.3847/1538-4357/ab4e11ISI: 000506001500013Scopus ID: 2-s2.0-85077307088OAI: oai:DiVA.org:kth-266927DiVA, id: diva2:1392472
Note

QC 20200207

Available from: 2020-02-07 Created: 2020-02-07 Last updated: 2020-02-17Bibliographically approved

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