标题： IRAS 星系的偶极各向异性与大尺度局部空腔的贡献 显示英文标题

标题： Dipole anisotropies of IRAS galaxies and the contribution of a large-scale local void

摘要： 近期的偶极各向异性观测表明，由红外星系团聚效应引起的本星系群（$\Vec v_{\rm G}$）速度在幅度和方向上与宇宙微波背景偶极各向异性（$\Vec v_{\rm CMB}$）的速度相似，但二者之间仍存在差异$| \Vec v_{\rm G} - \Vec v_{\rm CMB} |$，约为$\sim 170$公里/秒，约占$|\Vec v_{\rm CMB} |$的28%。 在此，我们考虑这种差异可能源于一个假设的大尺度局部空洞的可能性。通过这一假设的局部空洞的空间非均匀性，我们可以解释Ia型超新星加速现象，而无需引入暗能量，并且可以推导出局部空洞模型参数的约束条件。结果发现，本星系群与空洞中心之间的距离必须为$(10 -- 20) h^{-1}$兆秒差距，其准确值取决于背景模型参数。 显示英文摘要

摘要： Recent observations of dipole anisotropies show that the velocity of the Local Group ($\Vec v_{\rm G}$) induced by the clustering of IRAS galax ies has an amplitude and direction similar to those of the velocity of Cosmic Microwave Background dipole anisotropy ($\Vec v_{\rm CMB}$), but the difference $| \Vec v_{\rm G} - \Vec v_{\rm CMB} |$ is still $\sim 170$ km/s, which is about 28% of $|\Vec v_{\rm CMB} |$. Here we consider the possibility that the origin of this difference comes from a hypothetical large-scale local void, with which we can account for the accelerating behavior of type Ia supernovae due to the spatial inhomogeneity of the Hubble constant without dark energies and derive the constraint to the model parameters of the local void. It is found as a result that the distance between the Local Group and the center of the void must be $(10 -- 20) h^{-1}$ Mpc, whose accurate value depends on the background model parameters.