关于CS82巡天星系的质量集中和星等差
On Mass Concentrations & Magnitude Gaps of Galaxy Systems in the CS82 Survey
摘要：
具有大星等差距的星系系统-定义为中央星系和中央区域最亮卫星之间的星等差异-被认为具有更早的形成历史。在这项研究中，我们测量的质量浓度，作为早期形成的指标，由红移和星等差距划分的星系系统的合奏$r$带。我们使用互相关弱透镜测量与NFW参数质量配置文件来测量这些合奏的质量和浓度从一个目录的系统建立从SDSS Coadd的redMapPer算法。透镜剪切数据来自CFHT Stripe 82（CS 82）勘测，由SDSS Stripe 82区域的$i$波段图像组成。我们发现，堆栈组成的系统具有较大的幅度差距有一个更集中的平均概率高，在最低的红移片（$0.2<z<0.4$），无论是在四分位数（$P=0.98$）和三分位数（$P=0.85$）。这些结果提供可信度的说法，幅度差距是早期形成的系统的指标。
英文摘要：
Galaxy systems with large magnitude gaps - defined as the difference in magnitude between the central galaxy and the brightest satellite in the central region - have been claimed to have earlier formation histories. In this study we measure the mass concentration, as an indicator of early formation, of ensembles of galaxy systems divided by redshift and magnitude gaps in the $r$ band. We use cross-correlation weak lensing measurements with NFW parametric mass profiles to measure masses and concentrations of these ensembles from a catalogue of systems built from the SDSS Coadd by the redMaPPer algorithm. The lensing shear data come from the CFHT Stripe 82 (CS82) survey, and consists of $i$-band images of the SDSS Stripe 82 region. We find that the stack made up of systems with larger magnitude gaps has a high probability of being more concentrated on average, in the lowest redshift slice ($0.2<z<0.4$), both when dividing in quartiles ($P=0.98$) and terciles ($P=0.85$). These results lend credibility to the claim that the magnitude gap is an indicator of earlier formed systems.
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