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题名: The significance of anisotropic signals hiding in the Type Ia supernovae
作者: Lin, HN ;  Li, X ;  Chang, Z
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2016
卷号: 460, 期号:1, 页码:617-626
关键词: supernovae: general ;  large-scale structure of Universe
学科分类: Astronomy & Astrophysics
DOI: http://dx.doi.org/10.1093/mnras/stw995
通讯作者: Lin, HN (reprint author), Chongqing Univ, Dept Phys, Chongqing 401331, Peoples R China.
文章类型: Article
英文摘要: We use two different methods, i.e. dipole-fitting (DF) and hemisphere comparison (HC), to search for the anisotropic signals hiding in the Union2.1 data set. We find that the directions of maximum matter density derived using these two methods are about 114A degrees away from each other. We construct four Union2.1-like mock samples to test the statistical significance of these two methods. It is shown that DF method is statistically significant, while HC method is strongly biased by the distribution of data points in the sky. Then we assume that the anisotropy of distance modulus is mainly induced by the anisotropy of matter density, which is modelled to be the dipole form Omega(M) = Omega(M0)(1 - cos theta). We fit our model to Union2.1, and find that the direction of maximum matter density is well consistent with the direction derived using DF method, but it is very different from the direction previously claimed. Monte Carlo simulations show that our method is statistically more significant than HC method, although it is not as significant as DF method. The statistical significance can be further improved if the data points are homogeneously distributed in the sky. Due to the low quality of present supernovae data, however, it is still premature to claim that the Universe has any preferred direction.
类目[WOS]: Astronomy & Astrophysics
关键词[WOS]: FINE-STRUCTURE CONSTANT ;  LAMBDA-CDM ;  COSMOLOGICAL CONSTRAINTS ;  PREFERRED DIRECTION ;  HUBBLE DIAGRAM ;  UNIVERSE ;  EXPANSION ;  GALAXIES ;  ISOTROPY ;  MODEL
收录类别: SCI
项目资助者: National Natural Science Fund of China (NSFC) [11305181, 11547305] ;  State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China [Y5KF181CJ1] ;  NSFC [11375203]
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/21588
Appears in Collections:理论物理所2016年知识产出_期刊论文

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Recommended Citation:
Lin, HN,Li, X,Chang, Z. The significance of anisotropic signals hiding in the Type Ia supernovae[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,460(1):617-626.
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