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Article: Bayesian Analysis on the X-Ray Spectra of the Binary Neutron Star Merger GW170817

TitleBayesian Analysis on the X-Ray Spectra of the Binary Neutron Star Merger GW170817
Authors
KeywordsGamma-ray burst: individual (GRB170817A)
Gravitational waves
X-rays: individual (GW170817)
Issue Date2019
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/issn/22144048
Citation
Journal of High Energy Astrophysics, 2019, v. 21, p. 1-5 How to Cite?
AbstractFor the first time, we present a Bayesian time-resolved spectral study of the X-ray afterglow datasets of GW170817/GRB17017A observed by the Chandra X-ray Observatory. These include all 12 public datasets, from the earliest observation taken at t∼9 d to the newest observation at ∼359 d post-merger. While our results are consistent with the other works using Cash statistic within uncertainty, the Bayesian analysis we performed in this work have yielded Gaussian-like parameter distributions. We also obtained the parameter uncertainties directly from their posterior probability distributions. We are able to confirm that the power-law photon index has remained constant of Γ∼1.6 throughout the entire year-long observing period, except for the first dataset observed at t=8.9 d when Γ=1.04±0.44 is marginally harder. We also found that the unabsorbed X-ray flux peaked at t∼155 d, temporally consistent with the X-ray flare model suggested recently by Piro et al. (2019). The X-ray flux has been fading since ∼160 days after the merger and has returned to the level as first discovered after one year. Our result shows that the X-ray spectrum of GW170817/GRB170817A is well-described by a simple power-law originated from non-thermal slow-cooling synchrotron radiation. © 2019 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/271899
ISSN
2017 Impact Factor: 2.282
2015 SCImago Journal Rankings: 3.312

 

DC FieldValueLanguage
dc.contributor.authorLin, ET-
dc.contributor.authorYu, HF-
dc.contributor.authorKong, AKH-
dc.date.accessioned2019-07-20T10:31:39Z-
dc.date.available2019-07-20T10:31:39Z-
dc.date.issued2019-
dc.identifier.citationJournal of High Energy Astrophysics, 2019, v. 21, p. 1-5-
dc.identifier.issn2214-4048-
dc.identifier.urihttp://hdl.handle.net/10722/271899-
dc.description.abstractFor the first time, we present a Bayesian time-resolved spectral study of the X-ray afterglow datasets of GW170817/GRB17017A observed by the Chandra X-ray Observatory. These include all 12 public datasets, from the earliest observation taken at t∼9 d to the newest observation at ∼359 d post-merger. While our results are consistent with the other works using Cash statistic within uncertainty, the Bayesian analysis we performed in this work have yielded Gaussian-like parameter distributions. We also obtained the parameter uncertainties directly from their posterior probability distributions. We are able to confirm that the power-law photon index has remained constant of Γ∼1.6 throughout the entire year-long observing period, except for the first dataset observed at t=8.9 d when Γ=1.04±0.44 is marginally harder. We also found that the unabsorbed X-ray flux peaked at t∼155 d, temporally consistent with the X-ray flare model suggested recently by Piro et al. (2019). The X-ray flux has been fading since ∼160 days after the merger and has returned to the level as first discovered after one year. Our result shows that the X-ray spectrum of GW170817/GRB170817A is well-described by a simple power-law originated from non-thermal slow-cooling synchrotron radiation. © 2019 Elsevier B.V.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/issn/22144048-
dc.relation.ispartofJournal of High Energy Astrophysics-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectGamma-ray burst: individual (GRB170817A)-
dc.subjectGravitational waves-
dc.subjectX-rays: individual (GW170817)-
dc.titleBayesian Analysis on the X-Ray Spectra of the Binary Neutron Star Merger GW170817-
dc.typeArticle-
dc.identifier.emailYu, HF: davidyu@hku.hk-
dc.description.naturepostprint-
dc.identifier.doi10.1016/j.jheap.2019.01.001-
dc.identifier.scopuseid_2-s2.0-85060735708-
dc.identifier.hkuros298853-
dc.identifier.volume21-
dc.identifier.spage1-
dc.identifier.epage5-
dc.publisher.placeNetherlands-

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