论文标题
欧几里得准备:xx。颜色降低关系调查的完整校准:LBT观察和数据发布
Euclid preparation: XX. The Complete Calibration of the Color-Redshift Relation survey: LBT observations and data release
论文作者
论文摘要
颜色降低关系调查(C3R2)的完整校准是一项光谱计划,旨在通过经验校准与欧几里得深度(I_E = 24.5)的Galaxy Color-Redshift关系(I_E = 24.5),这是基于弱镜头相互作用的阶段IV黑暗能源项目的成功。正在收集欧几里得弱透镜样品中的星系的光谱校准样品,从星系颜色空间的自组织图(SOM)表示星系。在这里,我们介绍了使用LBT的LUCI仪器进行的近红外H和K波段光谱运动的结果。对于总共251个星系,我们在1.3 <= z <= 1.7和2 <= z <= 2.7范围内提出了新的高度可靠的红移。新确定的红移填充了49个SOM细胞,以前没有光谱测量,几乎是另外153个SOM细胞的职业数量的两倍。需要最终的光学观测工作来校准缺失的细胞,尤其是在红移范围内1.7 <= z <= 2.7缺乏光谱校准。最后,欧几里得本身将提供可以完成校准的无纹理NIR光谱。
The Complete Calibration of the Color-Redshift Relation survey (C3R2) is a spectroscopic programme designed to empirically calibrate the galaxy color-redshift relation to the Euclid depth (I_E=24.5), a key ingredient for the success of Stage IV dark energy projects based on weak lensing cosmology. A spectroscopic calibration sample as representative as possible of the galaxies in the Euclid weak lensing sample is being collected, selecting galaxies from a self-organizing map (SOM) representation of the galaxy color space. Here, we present the results of a near-infrared H- and K-bands spectroscopic campaign carried out using the LUCI instruments at the LBT. For a total of 251 galaxies, we present new highly-reliable redshifts in the 1.3<= z <=1.7 and 2<= z<=2.7 ranges. The newly-determined redshifts populate 49 SOM cells which previously contained no spectroscopic measurements and almost double the occupation numbers of an additional 153 SOM cells. A final optical ground-based observational effort is needed to calibrate the missing cells in particular in the redshift range 1.7<= z<=2.7 that lack spectroscopic calibration. In the end, Euclid itself will deliver telluric-free NIR spectra that can complete the calibration.