A KiDS weak lensing analysis of assembly bias in GAMA galaxy groups
A KiDS weak lensing analysis of assembly bias in GAMA galaxy groups
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DOI：
10.1093/mnras/stx705
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发表时间：
2017-03
影响因子：
4.8
通讯作者：
A. Dvornik;M. Cacciato;K. Kuijken;M. Viola;H. Hoekstra;R. Nakajima;E. V. Uitert;M. Brouwer;A. Choi;T. Erben;I. F. Conti;D. Farrow;R. Herbonnet;C. Heymans;H. Hildebrandt;A. Hopkins;J. McFarland;P. Norberg;P. Schneider;C. Sif'on;E. Valentijn;Lingyu Wang
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作者：
A. Dvornik;M. Cacciato;K. Kuijken;M. Viola;H. Hoekstra;R. Nakajima;E. V. Uitert;M. Brouwer;A. Choi;T. Erben;I. F. Conti;D. Farrow;R. Herbonnet;C. Heymans;H. Hildebrandt;A. Hopkins;J. McFarland;P. Norberg;P. Schneider;C. Sif'on;E. Valentijn;Lingyu Wang
我们使用来自更深的、高成像质量的光度基洛度调查的空间重叠区域的弱透镜测量，研究了从星系与质量组装(GAMA)调查中以光谱方式选择的星系组的可能的光晕组装偏差的特征。我们使用表观丰度大于4的GAMA群来识别具有可比较的平均宿主晕质量但卫星星系的径向分布不同的样本，这是晕形成时间的替代。对卫星分布较浅和较陡的两组的弱透镜信号进行了测量，没有发现晕集合偏置的迹象，偏置比为0.85+0.37−0.25 0.85−0.25+0.37，这与Λ冷暗物质的预测是一致的。我们的星系群具有1013M⊙h−1的典型质量，这自然地补充了以前关于星系团尺度上的晕组装偏差的研究。
We investigate possible signatures of halo assembly bias for spectroscopically selected galaxy groups from the Galaxy And Mass Assembly (GAMA) survey using weak lensing measurements from the spatially overlapping regions of the deeper, high-imaging-quality photometric Kilo-Degree Survey. We use GAMA groups with an apparent richness larger than 4 to identify samples with comparable mean host halo masses but with a different radial distribution of satellite galaxies, which is a proxy for the formation time of the haloes. We measure the weak lensing signal for groups with a steeper than average and with a shallower than average satellite distribution and find no sign of halo assembly bias, with the bias ratio of 0.85+0.37−0.25 0.85−0.25+0.37, which is consistent with the Λ cold dark matter prediction. Our galaxy groups have typical masses of 1013 M⊙ h−1, naturally complementing previous studies of halo assembly bias on galaxy cluster scales.