| タイトル | The Mach number of the cosmic flow - A critical test for current theories |
| 著者（英） | Suto, Yusushi; Ostriker, Jeremiah P. |
| 著者所属（英） | Ibaraki Univ.|Princeton Univ. Observatory |
| 発行日 | 1990-01-10 |
| 言語 | eng |
| 内容記述 | A new cosmological, self-contained test using the ratio of mean velocity and the velocity dispersion in the mean flow frame of a group of test objects is presented. To allow comparison with linear theory, the velocity field must first be smoothed on a suitable scale. In the context of linear perturbation theory, the Mach number M(R) which measures the ratio of power on scales larger than to scales smaller than the patch size R, is independent of the perturbation amplitude and also of bias. An apparent inconsistency is found for standard values of power-law index n = 1 and cosmological density parameter Omega = 1, when comparing values of M(R) predicted by popular models with tentative available observations. Nonstandard models based on adiabatic perturbations with either negative n or small Omega value also fail, due to creation of unacceptably large microwave background fluctuations. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 90A21053 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/358677 |
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