Anisotropy of the galaxies detected by IRAS.
Anisotropy of the galaxies detected by IRAS.
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IRAS 检测到的星系的各向异性。
DOI：
10.1007/978-94-009-4702-3_27
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发表时间：
1986
影响因子：
5
通讯作者：
M. Davis
中科院分区：
文献类型：
--
作者：
A. Meiksin;M. Davis
我们使用IRAS点源目录生成了6730个星系的目录，这些星系均匀地选择了大部分天空（> 9.5sr）。我们的目录揭示了一个小的（4-7%），但在星系分布中偶极各向异性指向l = 235°，b = 45°，在30°范围内的微波偶极各向异性。角相关分析表明，该目录子集的特征距离为D*≃50 - 100h- 1mpc。这些偶极子在方向上的良好一致性表明，IRAS星系大致追踪了大尺度质量分布，微波偶极子速度主要由局部超星系团（cz < 3000 km s -1）引起，并且表明宇宙密度很高（Ω≈0.5）。一项全天红移调查正在进行中，以获得更精确的估计。
We generate a catalogue of 6730 galaxies uniformly selected over most of the sky (> 9.5sr) using the IRAS point source catalogue. Our catalogue reveals a small (4–7%), but robust dipole anisotropy in the galaxy distribution that points towards l = 235°, b = 45°, within 30° of the microwave dipole anisotropy. Angular correlation analysis suggests that subsets of the catalogue have characteristic distances D* ≃50 – 100h-1 Mpc. The good agreement in direction of these dipoles suggests that the IRAS galaxies roughly trace the large scale mass distribution, that the microwave dipole velocity is mostly induced by the local supercluster (cz < 3000 km s -1), and that the indicated cosmological density is high (Ω ≈ 0.5). A full sky redshift survey is in progress to obtain a more precise estimate.