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arXiv 1208.3904astro-ph.CO
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深透镜巡天中10 Mpc尺度的星系-质量关联

Galaxy-Mass Correlations on 10 Mpc Scales in the Deep Lens Survey

Ami Choi, J. Anthony Tyson, Chris B. Morrison, M. James Jee, Samuel J. Schmidt, Vera E. Margoniner, David M. Wittman

摘要:

我们研究了小尺度(<几百kpc)的星系与质量的投影相关性,其中个别暗物质晕占主导地位,到15 Mpc的相关大尺度结构占主导地位。我们调查这些配置文件作为星系光度和红移的函数。在深透镜巡天中选择了80万个星系,我们使用测光红移和堆叠的弱引力透镜剪切层析成像,从前景星系中心到径向尺度为1度。我们检测相关的质量密度从多个晕和大尺度结构的半径大于维里半径,并找到了第一个观测证据的增长星系质量相关的10兆秒差距尺度的红移和固定范围的光度。对于一个固定的范围内的红移,我们发现一个缩放的投影晕质量与静止帧光度类似于以前的研究在较低的红移。我们控制系统误差的形状测量和光度红移,强制执行体积完整性,通过绝对幅度削减,并通过模拟探索剩余样本选择的影响。

英文摘要:

We examine the projected correlation of galaxies with mass from small scales (<few hundred kpc) where individual dark matter halos dominate, out to 15 Mpc where correlated large-scale structure dominates. We investigate these profiles as a function of galaxy luminosity and redshift. Selecting 0.8 million galaxies in the Deep Lens Survey, we use photometric redshifts and stacked weak gravitational lensing shear tomography out to radial scales of 1 degree from the centers of foreground galaxies. We detect correlated mass density from multiple halos and large-scale structure at radii larger than the virial radius, and find the first observational evidence for growth in the galaxy-mass correlation on 10 Mpc scales with decreasing redshift and fixed range of luminosity. For a fixed range of redshift, we find a scaling of projected halo mass with rest-frame luminosity similar to previous studies at lower redshift. We control systematic errors in shape measurement and photometric redshift, enforce volume completeness through absolute magnitude cuts, and explore residual sample selection effects via simulations.

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