Modelling galaxy-galaxy weak lensing with Sloan Digital Sky Survey groups

Modelling galaxy-galaxy weak lensing with Sloan Digital Sky Survey groups
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使用斯隆数字巡天组对星系间弱透镜效应进行建模

DOI:
10.1111/j.1365-2966.2009.14407.x
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发表时间:
2008-07
影响因子:
4.8
通讯作者:
van den Bosch, Frank C.
van den Bosch, Frank C.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Li, Ran;Mo, H. J.;More, Surhud;Cacciato, Marcello;Yang, Xiaohu;Fan, Zuhui;van den Bosch, Frank C.

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我们使用从斯隆数字巡天(SDSS)选择的星系群与质量模型的个别群体,研究预期从不同的光度和形态类型的星系星系的星系透镜信号。我们比较我们的模型预测与观测结果从SDSS由Mandelbaum等人。对于相同的星系样本。观测结果在基于威尔金森微波各向异性探测器(WMAP)3年数据的Lambda冷暗物质(Lambda CDM)模型中得到了很好的再现,但是具有更高sigma(8)的Lambda CDM模型,例如基于WMAP 1年数据的Lambda CDM模型,显着高估了星系-星系透镜信号。我们的模型,分别从不同的星系:中央与卫星,早型与晚型和不同质量的星系晕星系的星系透镜信号的贡献。我们还研究了预测的星系-星系透镜信号如何依赖于中央星系的形状、密度分布和相对于其宿主晕的位置。
We use galaxy groups selected from the Sloan Digital Sky Survey (SDSS) together with mass models for individual groups to study the galaxy-galaxy lensing signals expected from galaxies of different luminosities and morphological types. We compare our model predictions with the observational results obtained from the SDSS by Mandelbaum et al. for the same samples of galaxies. The observational results are well reproduced in a Lambda cold dark matter (Lambda CDM) model based on the Wilkinson Microwave Anisotropy Probe (WMAP) 3-yr data, but a Lambda CDM model with higher sigma(8), such as the one based on the WMAP 1-yr data, significantly overpredicts the galaxy-galaxy lensing signal. We model, separately, the contributions to the galaxy-galaxy lensing signals from different galaxies: central versus satellite, early type versus late type and galaxies in haloes of different masses. We also examine how the predicted galaxy-galaxy lensing signal depends on the shape, density profile and the location of the central galaxy with respect to its host halo.
使用 SDSS 星系群探测暗物质晕的内在形状和排列
DOI: 10.1111/j.1365-2966.2008.12927.x
发表时间: 2007-10
影响因子: 4.8
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