论文标题
PAU调查:窄带光度星系的内在比对和聚类
The PAU Survey: Intrinsic alignments and clustering of narrow-band photometric galaxies
论文作者
论文摘要
我们介绍了预测的聚类和固有比对(IA)的第一个测量值,该星系是由加速宇宙调查(PAUS)的物理学观察到的。在40个窄光通带($ 450 \ rm {nm} -850 \ rm {nm} $)中,光度法的光度法为$ 19_ {z} \ sim 0.01(1 + z)的光度光度估计质量为$ 19 \,\ rm {geg} $ rm {geg} $ cancase^2} $ canca^2} (CFHTLS)W3字段,允许我们测量预计的3D聚类和IA,用于磁通限制的,微弱的星系($ i <22.5 $)到$ z \ sim0.8 $。为了测量两点统计,我们使用模拟光度红移样品进行了开发和测试,“克隆”随机星系目录可以在3D中重现数据选择功能,并说明了光度法红移误差。在我们的基准颜色分析分析中,我们对蓝色星系的IA进行了可靠的无效检测,并在$ 0.1-18 \,h^{ - 1} \ rmmpc} $的尺度上对红星系的径向比对($ \sim1-3σ$)进行了暂定检测。 PAUS样品中的星系聚类相关功能与来自星系和大规模组装调查的光谱群体中的对应物相媲美,Modulo Modulo具有光度红移不确定性的影响,这倾向于使蓝色星系相关功能扁平,而红色的Galaxies则具有陡峭的趋势。我们研究了相关函数测量对随机目录创建中选择和沿视线的星系配对的敏感性,以准备在整个PAU区域进行优化的分析。
We present the first measurements of the projected clustering and intrinsic alignments (IA) of galaxies observed by the Physics of the Accelerating Universe Survey (PAUS). With photometry in 40 narrow optical passbands ($450\rm{nm}-850\rm{nm}$), the quality of photometric redshift estimation is $σ_{z} \sim 0.01(1 + z)$ for galaxies in the $19\,\rm{deg}^{2}$ Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) W3 field, allowing us to measure the projected 3D clustering and IA for flux-limited, faint galaxies ($i < 22.5$) out to $z\sim0.8$. To measure two-point statistics, we developed, and tested with mock photometric redshift samples, `cloned' random galaxy catalogues which can reproduce data selection functions in 3D and account for photometric redshift errors. In our fiducial colour-split analysis, we made robust null detections of IA for blue galaxies and tentative detections of radial alignments for red galaxies ($\sim1-3σ$), over scales of $0.1-18\,h^{-1}\rm{Mpc}$. The galaxy clustering correlation functions in the PAUS samples are comparable to their counterparts in a spectroscopic population from the Galaxy and Mass Assembly survey, modulo the impact of photometric redshift uncertainty which tends to flatten the blue galaxy correlation function, whilst steepening that of red galaxies. We investigate the sensitivity of our correlation function measurements to choices in the random catalogue creation and the galaxy pair-binning along the line of sight, in preparation for an optimised analysis over the full PAUS area.