EFFECTS OF STRONG GRAVITATIONAL LENSING ON MILLIMETER-WAVE GALAXY NUMBER COUNTS
EFFECTS OF STRONG GRAVITATIONAL LENSING ON MILLIMETER-WAVE GALAXY NUMBER COUNTS
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DOI：
10.1088/0004-637x/734/1/52
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发表时间：
2010-10
期刊：
影响因子：
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通讯作者：
Y. Hezaveh;G. Holder
中科院分区：
文献类型：
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作者：
Y. Hezaveh;G. Holder
利用光线跟踪模拟和两种非透镜源计数模型，研究了强透镜效应对毫米源观测计数的影响。我们根据光源的物理尺寸对最大可达到的放大系数进行了定量处理，同时也考虑了透镜晕椭圆度的影响。我们计算了包括强透镜效应在内的毫米级星系的预测计数和红移分布，并与最近南极望远镜(SPT)的源计数测量结果进行了比较。这些预测具有很大的不确定性，特别是透镜星系中质量分布的细节和源的有限范围，但SPT的观测结果与预测吻合很好。据预测，SPT探测到的源主要由z>；2处的强透镜星系组成。这些源的典型放大率强烈依赖于假定的未透镜源计数和观测到的源的通量。
We study the effects of strong lensing on the observed number counts of millimeter sources using a ray-tracing simulation and two number count models of unlensed sources. We employ a quantitative treatment of maximum attainable magnification factor depending on the physical size of the sources, also accounting for effects of lens halo ellipticity. We calculate predicted number counts and redshift distributions of millimeter galaxies including the effects of strong lensing and compare with the recent source count measurements of the South Pole Telescope (SPT). The predictions have large uncertainties, especially the details of the mass distribution in lens galaxies and the finite extent of sources, but the SPT observations are in good agreement with predictions. The sources detected by SPT are predicted to largely consist of strongly lensed galaxies at z > 2. The typical magnifications of these sources strongly depend on both the assumed unlensed source counts and the flux of the observed sources.