1. Theoretical estimates of integrated Sachs-Wolfe effect detection through the Australian Square Kilometre Array Pathfinder's Evolutionary Map of the Universe (ASKAP-EMU) survey, with confusion, position uncertainty, shot noise, and signal-to-noise ratio analysis
- Author
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Rahman, Syed Faisal ur
- Subjects
Wilkinson Microwave Anisotropy Probe (Space probe) -- Observations ,Cosmic background radiation -- Surveys -- Analysis ,Anisotropy -- Surveys -- Analysis ,Physics - Abstract
Detection of the late-time integrated Sachs-Wolfe (ISW) effect is an active area of study related to large-scale structures (LSSs). The ISW effect can be studied by observing the non-zero cross-correlation between cosmic microwave background (CMB) anisotropies with tracers of mass field, such as galaxy survey data. We study this effect by cross-correlating the CMB data and related cosmological parameters, as delineated by the Wilkinson Microwave Anisotropy Probe (WMAP), with the upcoming Evolutionary Map of the Universe (EMU) survey planned for the Australian Square Kilometre Array Pathfinder (ASKAP). ASKAPEMU will conduct a deep radio continuum survey with a root-mean-square (rms) flux of 10 µJy per beam (1 Jy = [10.sup.-26] W[m.sup.-2]H[z.sup.-1]). The survey will cover the entire southern sky, extending to +30° declination. To infer the expected redshift distribution (dN/dz) and differential source count (S) that can be extracted from the galaxies surveyed via EMU, we use data from the S- cubed simulation of extragalactic radio continuum sources (S3-SEX) for the Square Kilometre Array Design Studies (SKADS). We also calculate various parameters including galaxy survey shot noise, root mean square confusion uncertainty, and position uncertainty for the survey, which can help in understanding the accuracy of the survey results and in performing the data analysis. We also discuss signal-to-noise ratios over a range of maximum redshifts and maximum multipole values with some discussion on constraints over dark energy density parameter ([Ω.sub.Λ]) and baryonic matter density parameter ([Ω.sub.b]). PACS No.: 98.80.-k. La detection de l'effet integre de Sachs-Wolfe (ISW) en temps tardif est un champ d'etude tres actif relie aux structures a grande echelle (LSS). On peut etudier l'effet ISW en observant la correlation croisee non nulle entre les anisotropies du fond diffus cosmologique (CMB) avec les traceurs de champs de masse, comme les donnees de cartographie de galaxies. Nous planifions d'etudier cet effet par correlation croisee entre les donnees CMB et les parametres cosmologiques associes tels que definis par la sonde WMAP, avec la carte a venir de l'evolution de l'univers (EMU) planifiee pour le reseau australien d'un kilometre carre Pathfinder (ASKAP). Il est prevu que le programme EMU-ASKAP conduise a une etude profonde en continuum radio, de rms de 10 µJy (1Jy = [10.sup.-26] W[m.sup.-2] H[z.sup.-1]) par faisceau, couvrant toute la partie sud du ciel et s'etendant vers le nord jusqu';! une declinaison de +30°. Afin d'obtenir la distribution attendue du decalage vers le rouge (dN/dz) et la densite differentielle de signal (S) de notre etude, qui peuvent etre extraites des galaxies EMU, nous utilisons des simulations S-cube de continuum radio extragalactique ([S.sup.3]-SEX) pour un reseau d'un kilometre carre (SKADS). Nous calculons egalement divers parametres, incluant le bruit de grenaille galactique, l'incertitude rms de confusion et l'incertitude de position pour l'etude qui peut aider a mieux comprendre la precision et a analyser les donnees. Nous discutons egalement des rapports signal sur bruit sur un domaine maximal de decalages vers le rouge et des valeurs maximales des multipoles, ainsi que des contraintes sur [Ω.sub.Λ] et [Ω.sub.b]. [Traduit par le Redaction], 1. Introduction One of the biggest goals of modern cosmology is to understand dark energy and the distribution of matter in the universe. Galaxy surveys provide some of the most [...]
- Published
- 2015
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