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GRB 090423: Marking the death of a massive star at z=8.2
Lin, L; Liang, EW; Zhang SN(张双南); Zhang, SN
Corresponding AuthorLiang, EW (reprint author), Guangxi Univ, Dept Phys, Nanning 530004, Peoples R China.
AbstractGRB 090423 is the new high-z record holder of Gamma-ray bursts (GRBs) with z similar to 8.2. We present a detailed analysis of both the spectral and temporal features of GRB 090423 observed with Swift/BAT and Fermi/GBM. We find that the T 90 observed with BAT in the 15-150 keV band is 13.2 s, corresponding to similar to 1.4 s at z=8.2. It once again gives rise to the issue of whether the progenitors of high-z GRBs are massive stars or mergers since the discovery of GRB 080913 at z=6.7. In comparison with the T 90 distribution in the burst frame of the current redshift-known GRB sample, we find that it is marginally grouped into the long group (Type II GRBs). The spectrum observed with both BAT and GBM is well fitted by a power-law with exponential cutoff, which yields an E(p)=(50.4 +/- 7.0) keV. The event satisfies the Amati-relation well for Type II GRBs within their 3 sigma uncertainty range. Our results indicate that this event would be produced by the death of a massive star. Based on the Amati-relation, we derive its distance modulus, which follows the Hubble diagram of the concordance cosmology model at a redshift of similar to 8.2.
Keywordgamma-ray bursts high energy phenomenon cosmology
Subject AreaPhysics
Indexed BySCI ; ADS
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000280291800014
ADS Bibcode2010SCPMA..53S..64L
ADS URLhttps://ui.adsabs.harvard.edu/abs/2010SCPMA..53S..64L
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2010SCPMA..53S..64L/citations
Citation statistics
Cited Times:8 [ADS]
Document Type期刊论文
Recommended Citation
GB/T 7714
Lin, L,Liang, EW,Zhang SN,et al. GRB 090423: Marking the death of a massive star at z=8.2[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2010,53(1):#REF!.
APA Lin, L,Liang, EW,张双南,&Zhang, SN.(2010).GRB 090423: Marking the death of a massive star at z=8.2.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,53(1),#REF!.
MLA Lin, L,et al."GRB 090423: Marking the death of a massive star at z=8.2".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 53.1(2010):#REF!.
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