WEAK GRAVITATIONAL LENSING AS A PROBE OF PHYSICAL PROPERTIES OF SUBSTRUCTURES IN DARK MATTER HALOS
WEAK GRAVITATIONAL LENSING AS A PROBE OF PHYSICAL PROPERTIES OF SUBSTRUCTURES IN DARK MATTER HALOS
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DOI：
10.1088/0004-637x/799/2/188
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发表时间：
2014-07
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影响因子：
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通讯作者：
M. Shirasaki
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文献类型：
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作者：
M. Shirasaki
我们提出了一种新的方法来选择卫星星系的星系团或星系团的外部区域使用弱引力透镜。该方法是基于理论上的期望，切向剪切图案卫星星系周围会出现负值的偏移距离的中心的主晕。因此，我们可以定位的卫星星系的统计偏移距离的几个透镜平滑尺度，通过使用标准的重建表面质量密度图从弱透镜观测。我们使用高分辨率的宇宙学模拟来测试这个想法。我们表明，subhalos从主机晕的中心分离成功地定位，即使没有假设的中心的位置。对于一些这样的晕，特征质量和偏移长度也可以在统计的基础上估计。我们进行费舍尔分析，以显示如何以及即将到来的弱透镜调查可以约束卫星星系的质量密度分布。对于天空覆盖范围为20，000 deg 2的大型综合巡天望远镜，星系团外部区域的成员星系的质量可以被限制在0.1 dex的精度，对于质量为1014 h−1 M的星系团，z = 0.15。最后，我们探讨了具有1011-1013 h−1 M潮汐的广泛质量的subhalos的潮汐剥离特征的可探测性。
We propose a novel method to select satellite galaxies in outer regions of galaxy groups or clusters using weak gravitational lensing. The method is based on the theoretical expectation that the tangential shear pattern around satellite galaxies would appear with negative values at an offset distance from the center of the main halo. We can thus locate the satellite galaxies statistically with an offset distance of several lensing smoothing scales by using the standard reconstruction of surface mass density maps from weak lensing observation. We test the idea using high-resolution cosmological simulations. We show that subhalos separated from the center of the host halo are successfully located even without assuming the position of the center. For a number of such subhalos, the characteristic mass and offset length can be also estimated on a statistical basis. We perform a Fisher analysis to show how well upcoming weak lensing surveys can constrain the mass density profile of satellite galaxies. In the case of the Large Synoptic Survey Telescope with a sky coverage of 20,000 deg2, the mass of the member galaxies in the outer region of galaxy clusters can be constrained with an accuracy of ∼0.1 dex for galaxy clusters with mass 1014 h−1 M☉ at z = 0.15. Finally we explore the detectability of tidal stripping features for subhalos having a wide range of masses of 1011–1013 h−1 M☉.