Euclid is a proposed high-precision survey mission to map the geometry of the Dark Universe with demonstrated feasibility. Euclid's Visible - Near-InfraRed imaging and spectroscopy of the extragalactic sky will further produce extensive legacy science to the boundaries of the visible universe. The mission is optimised for two primary cosmological probes: Weak gravitational Lensing (WL) and Baryonic Acoustic Oscillations (BAO). Euclid's wide survey will cover 20,000 deg2, measuring shapes and redshifts of galaxies to redshift 2. For weak lensing, Euclid will measure the shape of over 2 billion galaxies with a density of 30-40 resolved galaxies per arcmin2 in one broad visible R+I+Z band (550-920 nm) down to AB mag 24.5 (10sigma). The photometric redshifts for these galaxies are derived from three additional Euclid NIR bands (Y,J,H in the range 0.92-2.0 micron) reaching AB mag 24 (5sigma) in each, complemented by photometry from ground based surveys. The BAO are determined from a NIR spectroscopic survey with a redshift accuracy of dz/(1+z) =0.001. The baseline payload consists of a Korsch telescope with a primary mirror of 1.2 m diameter and is designed to provide a large field of view (0.5 deg2) to three scientific instruments: (1) VIS: a CCD based optical imaging channel, (2) NIP: a NIR imaging photometry channel, and (3) NIS: a NIR spectrometric channel. This report presents an overview of the assessment study phase of the Euclid candidate M-class Cosmic Vision mission; it will provide a description of the Euclid science objectives, the mission implementation and payload, and the envisaged data handling.
Space Project for Astrophysical and Cosmological Exploration (SPACE), an ESA stand-alone mission and a possible contribution to the Origins Space Telescope
Euclid: Galaxy cluster detection through the weak lensing effect - algorithm assessment and selection
Universidad Politécnica de Cartagena(卡塔赫纳理工大学);Durham University(杜伦大学);Université Paris-Saclay(巴黎萨克雷大学);Université Paris Cité(巴黎西岱大学);CEA(法国原子能和替代能源委员会);CNRS(法国国家科学研究中心);Instituto de Física de Cantabria(坎塔布里亚物理研究所);INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna(博洛尼亚天文物理学与空间科学观测站(意大利国家天体物理研究所));INFN-Sezione di Bologna(博洛尼亚意大利国家核物理研究所);Università di Bologna(博洛尼亚大学);INAF, Istituto di Radioastronomia(意大利国家天体物理研究所射电天文学研究所);University of Heidelberg(海德堡大学)
欧几里德是欧空局的一项任务,旨在通过弱引力透镜和星系聚集来限制暗能量和引力的性质。它将在可见光和近红外波段进行广域成像和光谱调查(EWS),在六年内覆盖大约15,000平方度的河外天空。宽视场望远镜和仪器针对原始PSF和减少杂散光进行了优化,产生非常清晰的图像。本文介绍了欧几里德参考调查的建设:EWS的指向序列,深场,辅助领域的校准,航天器的运动,其次是欧几里德,因为它在一个步进和凝视模式下运行,从它的轨道周围的拉格朗日点L2。每个EWS指向有四个抖动帧,我们模拟抖动模式在像素级分析的有效覆盖。我们使用最新的天空背景模型来定义Euclid感兴趣区域(RoI)。参考测量的建立受到校准节奏、航天器限制和背景水平的高度限制;还考虑了与地面覆盖的协同作用。通过优化的软件,以优先考虑最佳天空区域,产生紧凑的覆盖范围,并确保热稳定性,我们为辅助和深场观测生成一个时间表,并安排与EWS过境观测的ROI。生成的参考测量RSD_2021A满足所有约束条件,是最终解决方案的良好代表。它的范围覆盖14,500平方度。在其足迹中达到的极限AB星等($5σ$点状源)估计为26.2(可见光)和24.5(近红外);对于光谱学,H $_α$线通量极限为1600 nm处的$2\times 10^{-16}$ erg cm $^{-2}$ s $^{-1}$;对于漫发射,表面亮度极限为29.8(可见光)和28.4(近…
由于地面望远镜上多目标摄谱仪的出现,星系巡天正在复兴。在过去的15年里,我们看到了这一实验进展的成果,包括2度场星系红移巡天(2dFGRS; Colless et al. 2003)和斯隆数字巡天(SDSS; York et al. 2000)。最近,重子振荡光谱巡天(BOSS; Dawson et al. 2013),SDSS-III项目(Eisenstein et al. 2011)的一部分,提供了有史以来最大体积的低红移宇宙,其星系密度可用于高精度宇宙学。这套课堂讲稿着眼于支撑这些测量的一些物理过程,测量本身的演变,并展望未来15年和调查的出现,如增强的重子振荡光谱调查(eBOSS),暗能量光谱仪器(DESI)和欧空局欧几里得卫星任务。
Euclid: Early Release Observations. Weak gravitational lensing analysis of Abell 2390
Universität Innsbruck(因斯布鲁克大学);Universität Bonn(波恩大学);Institute for Astronomy, University of Edinburgh(爱丁堡大学天体物理研究所);Aix-Marseille Université(艾克斯-马赛大学);Institut d’Astrophysique de Paris(巴黎天体物理研究所);Sorbonne Université(索邦大学);Department of Astronomy, University of Geneva(日内瓦大学天文系);Université Paris-Saclay(巴黎萨克雷大学);Université Paris Cité(巴黎西岱大学)