论文标题
测试3D-HST光度红移估计值作为深度弱透镜研究的参考样品
Testing the accuracy of 3D-HST photometric redshift estimates as reference samples for deep weak lensing studies
论文作者
论文摘要
为了校准质量代理，需要对群集的准确弱透镜质量估计来进行宇宙学的剥削星系簇调查。这样的测量需要准确了解弱透镜源星系的红移分布。在这种情况下，我们研究了由3D-HST团队计算的宇宙组件近红外深层深度静脉外传统调查领域计算的光度红移（照片 - $ z $ s）的准确性，该测量领域为深度弱透镜研究提供了相关的光度参考数据集。通过与Hubble Ultra Deep Field的非常深的数据相比，通过与光谱红移和照片-Y $ Z $ S进行比较，我们确定了3D-HST/Candels目录中的灾难性红移异常值。如果不考虑，这些将显着偏向弱透镜结果。我们研究了这些异常值的原因，并证明光谱分布（SED）模板的插值以及光度数据的良好组合可以减少弱透镜研究的净影响。
Accurate weak lensing mass estimates of clusters are needed in order to calibrate mass proxies for the cosmological exploitation of galaxy cluster surveys. Such measurements require accurate knowledge of the redshift distribution of the weak lensing source galaxies. In this context, we investigate the accuracy of photometric redshifts (photo-$z$s) computed by the 3D-HST team for the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey fields, which provide a relevant photometric reference data set for deep weak lensing studies. Through the comparison to spectroscopic redshifts and photo-$z$s based on very deep data from the Hubble Ultra Deep Field, we identify catastrophic redshift outliers in the 3D-HST/CANDELS catalogue. These would significantly bias weak lensing results if not accounted for. We investigate the cause of these outliers and demonstrate that the interpolation of spectral energy distribution (SED) templates and a well-selected combination of photometric data can reduce the net impact for weak lensing studies.
