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Contribution au projet LSST : développement d'un banc de test pour la caméra et étude des oscillaions acousiques de baryons

Abstract : The LSST telescope (Large Synoptic Survey Telescope) is part of the new generation of opticalinstruments whose aim is to achieve a complete map of the Universe. With its wide and largefield of view, it will observed billions of galaxies, in six optical photometric bands. allowing thestudy of many scientifcc subjects. In particular, LSST data will accurately measure Dark Energyparameters through four distinct probes: supernovae, week lensing, clusters and Baryon AcousticOscillations (BAO). The combination of those different probes should allowed the discriminationbetween theoretical models describing the dark energy. This thesis is part of the development ofthe LSST project and presents both an instrumental and a phenomenological study. First, thework concerning the development of the optical calibration bench for LSST's camera is presented.The measurements then performed led to the establishment of the light source final design.The calibration bench will thus allow measurement of the camera focal plan response withinthe six wavelength corresponding to LSST filters. We then present a complete analysis chainwhose objective is to estimate the accuracy with which the characteristics BAOs scale should bemeasured considering LSST simulated data. With this aim,a galaxy catalog were simulate froma CDM cosmology. An enhanced template setting method has been developed, combined withstatistical tests, it allowed a significant improvement of the photo-z reconstruction quality up,in agreement with LSST requirements. A study of the impact of the filterslters transmission curvesallowed the optimization of their bandwidth and showed the importance of their calibration.Finally the BAOs scale was estimated taking into account the photo-z errors, compelling thewhole simulation.
Keywords : Ccob Bao Lsst Photo-Z
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Submitted on : Thursday, January 18, 2018 - 12:17:07 PM
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Adeline Choyer. Contribution au projet LSST : développement d'un banc de test pour la caméra et étude des oscillaions acousiques de baryons. Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]. Université Grenoble Alpes, 2015. Français. ⟨NNT : 2015GREAY100⟩. ⟨tel-01687285⟩



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