探测IGM大尺度流：空壳处星系的弯曲
Probing IGM large-scale flows: warps in galaxies at shells of voids
摘要：
上下文流体动力学宇宙学模拟预测了星系际介质沿着空洞径向矢量的流动，大致沿着星系形成早期物质下落的方向。目标。这些流动可能会被检测到通过分析的依赖性的弯曲幅度的倾斜度的星系在壳的空隙相对于径向矢量的空隙。这一分析将是本文的主题。方法.我们发展了一种统计方法来分析弯曲幅度和星系在空洞表面的倾角之间的相关性。这是适用于从斯隆数字巡天的97个边缘星系的样本。我们的结果进行了比较与理论预期，这也是本文所得出的。结果我们的结果允许我们拒绝零假设（即，在94.4%C时，星系相对于空表面的翘曲幅度和倾角的不相关性）。L.，这还不是决定性的目前不能排除径向流的不存在，尽管我们可以对<~ 4 Ω_b ρ_crit的径向流的重子物质的最大平均密度加以限制<rho_b>。
英文摘要：
CONTEXT. Hydrodynamical cosmological simulations predict flows of the intergalactic medium along the radial vector of the voids, approximately in the direction of the infall of matter at the early stages of the galaxy formation. AIMS. These flows might be detected by analysing the dependence of the warp amplitude on the inclination of the galaxies at the shells of the voids with respect to the radial vector of the voids. This analysis will be the topic of this paper. METHODS. We develop a statistical method of analysing the correlation of the amplitude of the warp and the inclination of the galaxy at the void surface. This is applied to a sample of 97 edge-on galaxies from the Sloan Digital Sky Survey. Our results are compared with the theoretical expectations, which are also derived in this paper. RESULTS. Our results allow us to reject the null hypothesis (i.e., the non-correlation of the warp amplitude and the inclination of the galaxy with respect to the void surface) at 94.4% C. L., which is not conclusive. The absence of the radial flows cannot be excluded at present, although we can put a constraint on the maximum average density of baryonic matter of the radial flows of <rho_b> <~ 4 Omega_b rho_crit.
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