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Gamma-Ray Burst in Swift and Fermi Era
Zheng, WeiKang1; Wu, Xuefeng2; Sakamoto, Takanori3; Urata, Yuji4,5; Pandey, Shashi B.6
AbstractWe update gamma-ray burst (GRB) luminosity relations among certain spectral and light-curve features with 139 GRBs. The distance modulus of 82 GRBs at z > 1.4 can be calibrated with the sample at z <= 1.4 by using the cubic spline interpolation method from the Union2.1 Type Ia supernovae (SNe Ia) set. We investigate the joint constraints on the Cardassian expansion model and dark energy with 580 Union2.1 SNe Ia sample (z < 1.4) and 82 calibrated GRBs' data (1.4 < z <= 8.2). In Lambda CDM, we find that adding 82 high-z GRBs to 580 SNe Ia significantly improves the constraint on Omega(m)-Omega(Lambda) plane. In the Cardassian expansion model, the best fit is Omega(m) = 0.24(-0.15)(+0.15) and n = 0.16(-0.52)(+0.30) (1 sigma), which is consistent with the Lambda CDM cosmology (n = 0) in the 1 sigma confidence region. We also discuss two dark energy models in which the equation of state omega(z) is parameterized as omega(z) = omega(0) and omega(z) = omega(0) + omega(1)z/(1+z), respectively. Based on our analysis, we see that our universe at higher redshift up to z = 8.2 is consistent with the concordance model within 1 sigma confidence level.
Subject Area天文和天体物理
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000360717200001
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Document Type期刊论文
Affiliation1.Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Aoyama Gakuin Univ, Dept Math & Phys, Sagamihara, Kanagawa 2525258, Japan
4.Natl Cent Univ, Inst Astron, Chungli 32054, Taiwan
5.Acad Sinica, Inst Astron & Astrophys, Taipei 106, Taiwan
6.Aryabhatta Res Inst Observat Sci, Manora Peak 263129, Nainital, India
Recommended Citation
GB/T 7714
Zheng, WeiKang,Wu, Xuefeng,Sakamoto, Takanori,et al. Gamma-Ray Burst in Swift and Fermi Era[J]. ADVANCES IN ASTRONOMY,2015:543624.
APA Zheng, WeiKang,Wu, Xuefeng,Sakamoto, Takanori,Urata, Yuji,&Pandey, Shashi B..(2015).Gamma-Ray Burst in Swift and Fermi Era.ADVANCES IN ASTRONOMY,543624.
MLA Zheng, WeiKang,et al."Gamma-Ray Burst in Swift and Fermi Era".ADVANCES IN ASTRONOMY (2015):543624.
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