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The significance of anisotropic signals hiding in the Type Ia supernovae
Lin, HN; Li, X; Chang, Z; Lin, HN (reprint author), Chongqing Univ, Dept Phys, Chongqing 401331, Peoples R China.
2016
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号460期号:1页码:617-626
文章类型Article
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.
关键词Supernovae: General Large-scale Structure Of Universe
学科领域Astronomy & Astrophysics
资助者National Natural Science Fund of China (NSFC) [11305181, 11547305] ; National Natural Science Fund of China (NSFC) [11305181, 11547305] ; National Natural Science Fund of China (NSFC) [11305181, 11547305] ; 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] ; State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China [Y5KF181CJ1] ; State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China [Y5KF181CJ1] ; State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China [Y5KF181CJ1] ; NSFC [11375203] ; NSFC [11375203] ; NSFC [11375203] ; NSFC [11375203] ; National Natural Science Fund of China (NSFC) [11305181, 11547305] ; National Natural Science Fund of China (NSFC) [11305181, 11547305] ; National Natural Science Fund of China (NSFC) [11305181, 11547305] ; 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] ; State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China [Y5KF181CJ1] ; State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China [Y5KF181CJ1] ; State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China [Y5KF181CJ1] ; NSFC [11375203] ; NSFC [11375203] ; NSFC [11375203] ; NSFC [11375203]
DOIhttp://dx.doi.org/10.1093/mnras/stw995
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
语种英语
资助者National Natural Science Fund of China (NSFC) [11305181, 11547305] ; National Natural Science Fund of China (NSFC) [11305181, 11547305] ; National Natural Science Fund of China (NSFC) [11305181, 11547305] ; 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] ; State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China [Y5KF181CJ1] ; State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China [Y5KF181CJ1] ; State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China [Y5KF181CJ1] ; NSFC [11375203] ; NSFC [11375203] ; NSFC [11375203] ; NSFC [11375203] ; National Natural Science Fund of China (NSFC) [11305181, 11547305] ; National Natural Science Fund of China (NSFC) [11305181, 11547305] ; National Natural Science Fund of China (NSFC) [11305181, 11547305] ; 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] ; State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China [Y5KF181CJ1] ; State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China [Y5KF181CJ1] ; State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China [Y5KF181CJ1] ; NSFC [11375203] ; NSFC [11375203] ; NSFC [11375203] ; NSFC [11375203]
WOS类目Astronomy & Astrophysics
引用统计
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/21588
专题理论物理所SCI论文
通讯作者Lin, HN (reprint author), Chongqing Univ, Dept Phys, Chongqing 401331, Peoples R China.
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GB/T 7714
Lin, HN,Li, X,Chang, Z,et al. The significance of anisotropic signals hiding in the Type Ia supernovae[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,460(1):617-626.
APA Lin, HN,Li, X,Chang, Z,&Lin, HN .(2016).The significance of anisotropic signals hiding in the Type Ia supernovae.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,460(1),617-626.
MLA Lin, HN,et al."The significance of anisotropic signals hiding in the Type Ia supernovae".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 460.1(2016):617-626.
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