arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0912.0914astro-ph.COastro-ph.GAastro-ph.IM
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ESA宇宙观的欧几里得评估研究报告

Euclid Assessment Study Report for the ESA Cosmic Visions

R. Laureijs

摘要:

欧几里德是一个拟议中的高精度测量任务,以绘制黑暗宇宙的几何形状,并证明其可行性。欧几里德的可见-近红外成像和河外天空光谱学将进一步产生广泛的遗产科学的边界可见宇宙。该任务针对两个主要的宇宙学探测器进行了优化:弱引力透镜(WL)和重子声振荡(BAO)。欧几里德的广泛调查将覆盖20,000平方度,测量星系的形状和红移到2。对于弱透镜,欧几里德将测量超过20亿个星系的形状,密度为每弧分2 30-40个解析星系,在一个宽可见光R+I+Z波段(550-920 nm),低至AB等24.5(10 sigma)。这些星系的测光红移来自三个额外的欧几里德近红外波段(Y,J,H在0.92-2.0微米范围内),每个波段达到AB 24等(5西格玛),并辅以地面测量的测光。BAO是从具有dz/(1+z)=0.001的红移精度的NIR光谱测量确定的。基线有效载荷包括一个科尔施望远镜,其主镜直径为1.2米,设计用于为三种科学仪器提供大视场(0.5平方度):(1)VIS:基于CCD的光学成像通道;(2)NIP:近红外成像测光通道;(3)NIS:近红外光谱通道。本报告概述了欧几里德候选M级宇宙视野飞行任务的评估研究阶段;它将介绍欧几里德的科学目标、飞行任务的执行和有效载荷以及设想的数据处理。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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