MAGNIFICATION BY GALAXY GROUP DARK MATTER HALOS
MAGNIFICATION BY GALAXY GROUP DARK MATTER HALOS
复制标题
DOI：
10.1088/0004-637x/754/2/143
复制
发表时间：
2011-11
期刊：
影响因子：
--
通讯作者：
Jes Ford;H. Hildebrandt;L. van Waerbeke;A. Leauthaud;P. Capak;A. Finoguenov;Masayuki Tanaka;M. George;J. Rhodes
中科院分区：
文献类型：
--
作者：
Jes Ford;H. Hildebrandt;L. van Waerbeke;A. Leauthaud;P. Capak;A. Finoguenov;Masayuki Tanaka;M. George;J. Rhodes
我们报告的引力透镜放大率的检测人口的星系群，在4.9σ的显着性水平。使用X射线选择的COSMOS 1.64 deg 2字段中的组，高红移莱曼突破星系作为源，我们测量透镜引起的样本之间的角互相关。在满足一致性检查后，证明我们确实检测到放大信号，并且没有受到样本物理重叠的污染，我们继续实施最佳加权互相关函数，以进一步提高测量的信噪比。解释这种最佳加权测量使我们能够研究透镜群的性质。我们模型的完整分布的群质量使用复合晕的方法，考虑到奇异的等温球和Navarro-Frenk-白色配置文件，并找到我们的最佳拟合值是一致的恢复使用弱透镜剪切技术。我们认为，未来的弱透镜的研究将需要结合放大沿着剪切，既要减少残留的系统，并充分利用所有可用的源信息，在努力最大限度地提高科学产量的观察。
We report on the detection of gravitational lensing magnification by a population of galaxy groups, at a significance level of 4.9σ. Using X-ray-selected groups in the COSMOS 1.64 deg2 field, and high-redshift Lyman break galaxies as sources, we measure a lensing-induced angular cross-correlation between the samples. After satisfying consistency checks that demonstrate we have indeed detected a magnification signal, and are not suffering from contamination by physical overlap of samples, we proceed to implement an optimally weighted cross-correlation function to further boost the signal to noise of the measurement. Interpreting this optimally weighted measurement allows us to study properties of the lensing groups. We model the full distribution of group masses using a composite-halo approach, considering both the singular isothermal sphere and Navarro–Frenk–White profiles, and find our best-fit values to be consistent with those recovered using the weak-lensing shear technique. We argue that future weak-lensing studies will need to incorporate magnification along with shear, both to reduce residual systematics and to make full use of all available source information, in an effort to maximize scientific yield of the observations.