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Comparison between hemisphere comparison method and dipole-fitting method in tracing the anisotropic expansion of the Universe use the Union2 data set
Chang Z(常哲); Lin HN(林海南); Chang, Z; Lin, HN
2015
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号446期号:3页码:2952-2958
通讯作者林海南
文章类型Article
摘要Type Ia supernovae (SNe Ia) are often used as the standard candles to probe the anisotropic expansion of the Universe. In this paper, we make a comprehensive comparison between the hemisphere comparison (HC) method and dipole-fitting (DF) method in searching for the cosmological preferred direction using the Union2 data set, a compilation of 557 well-calibrated SNe Ia. We find that the directions of the faintest SNe Ia derived from these two methods are approximately opposite. Monte Carlo simulations show that the results of the HC method strongly depend on the distribution of the data points in the sky. The coincidence that the HC method and DF method give two completely opposite directions may be due to the extremely non-uniform distribution of the Union2 data set.
关键词supernovae: general large-scale structure of Universe
学科领域Astronomy & Astrophysics
DOI10.1093/mnras/stu2349
收录类别SCI
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000350272300059
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228275
专题理论物理室
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Chang Z,Lin HN,Chang, Z,et al. Comparison between hemisphere comparison method and dipole-fitting method in tracing the anisotropic expansion of the Universe use the Union2 data set[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,446(3):2952-2958.
APA 常哲,林海南,Chang, Z,&Lin, HN.(2015).Comparison between hemisphere comparison method and dipole-fitting method in tracing the anisotropic expansion of the Universe use the Union2 data set.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,446(3),2952-2958.
MLA 常哲,et al."Comparison between hemisphere comparison method and dipole-fitting method in tracing the anisotropic expansion of the Universe use the Union2 data set".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 446.3(2015):2952-2958.
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