The significance of anisotropic signals hiding in the Type Ia supernovae
文献类型：期刊论文
| 作者 | Li, X; Lin, HN; Chang, Z; Lin, HN (reprint author), Chongqing Univ, Dept Phys, Chongqing 401331, Peoples R China. |
| 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 |
| DOI | http://dx.doi.org/10.1093/mnras/stw995 |
| 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. |
| 学科主题 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/21588]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 通讯作者 | Lin, HN (reprint author), Chongqing Univ, Dept Phys, Chongqing 401331, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Li, X,Lin, HN,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 | Li, X,Lin, HN,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 | Li, X,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. |
入库方式： OAI收割
来源：理论物理研究所
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