Дисертації з теми "Euclid mission"
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Tutusaus, Lleixa Isaac. "Étude des composantes noires de l'univers avec la mission Euclid." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30212/document.
Повний текст джерелаThe concordance model of cosmology, called ΛCDM, is a success, since it is able to reproduce the main cosmological observations with great accuracy and only few parameters. However, it predicts the existence of cold dark matter and dark energy in the form of a cosmological constant, which have not been directly detected yet. Therefore, it is important to consider models going beyond ΛCDM, and confront them against observations, in order to improve our knowledge on the dark sector of the Universe. The future Euclid satellite from the European Space Agency will probe a huge volume of the large-scale structure of the Universe using mainly the clustering of galaxies and the distortion of their images due to gravitational lensing. In this work, we quantitatively estimate the constraining power of the future Euclid data for the concordance model, as well as for some phenomenological extensions of it, modifying both dark components of the Universe. In particular, we pay special attention to the cross-correlations between the different Euclid probes when combining them, and assess their impact on the final results. On one hand, we show that Euclid will provide exquisite constraints on cosmological models that will definitely shed light on the dark sector. On the other hand, we show that cross-correlations between Euclid probes cannot be neglected in future analyses, and, more importantly, that the addition of these correlations largely improves the constraints on the cosmological parameters
Chatron, Jeremie. "Explorer l'Univers primordial avec les quasars : cas de la mission Euclid." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4705/document.
Повний текст джерелаThe main topic of this thesis is the study of the distant Universe, particularly the study of a quite unknown period of our Universe namely "reionization." The probe's choice used in the study of a universe so far is somewhat restricted. Indeed it is necessary that the probe be visible at this distance and therefore the probe must be a very bright objet. Thus we used high-energy galaxies with an active galactic nuclei (called quasars) as a probe. By studying the emission of these quasars we can then characterize the environment around them. Because of the huge distance between us and the quasar and due to the expansion of the universe they have their light emissions shifted towards longer wavelengths. Thus, to study the young age of our universe, we need to observe objects in the infrared. These quasars are rare objects, we need to search over a large area of the sky to hope to get a few. There are many projects focused on observational cosmology, a future major project named Euclid will be a big step for the study of reionization. This future ESA satellite (launch planned in 2020) will be particularly effective in the infrared, thus allowing to detect quasars at distances currently unfathomed. In order to prepare this mission we must establish and predict the expected performance of Euclid. To do this, we must conduct a similar study on existing data and extrapolate the performance of Euclid. To do this, in my thesis, I used datas from the terrestrial telescope CFHT (Canada France Hawaii Telescope) located in hawaii at Mauna Kea
Allanwood, Edgar. "PSF characterisation and optimisation of a CCD for the ESA Euclid mission." Thesis, Open University, 2018. http://oro.open.ac.uk/58394/.
Повний текст джерелаKANSAL, Vanshika. "Simulation of Solar System Objects for the NISP instrument of the ESA Euclid Mission." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-72221.
Повний текст джерелаSerra, Benoit. "Caractérisation des détecteurs infrarouges de la mission spatiale Euclid : étude des performances des détecteurs infrarouges H2RG." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4008/document.
Повний текст джерелаThe Euclid space mission aims to provide answers about the nature of the accelerating expansion of the Universe. To determine the properties of this acceleration, the Euclid space mission will conduct a survey of galaxies on a field of 15,000 deg² field of view. Each field will be studied through imaging (VIS instrument) and spectroscopy (NISP instrument) that requires control of instrumental errors, and particularly the detection system. The study made for the thesis can be summarized in several stages: the first is to assess the performance of NISP starting from the definition of the signal to noise ratio and to derive specifications on the detection system. The second is the study of the need for characterization of the detection system of the instrument, the H2RG infrared detectors. From this study, we show the performance of a detector on a dedicated test bench. The third step is the study of the detection of cosmic rays in flight as well as the realization of a tool to isolate the pixels affected using ground data processing. After evaluating the performance of the algorithm, we will show the results of the data analysis. The last part is the study of the persistence effect affecting H2RG detectors: from the impact of the signal on the observations of NISP, we will define the necessary measures for this purpose. We will describe the data acquisition campaign, accompanied by the analysis and physical interpretation of persistence. These analyzes helped to understand the issues of the persistence effect and were used to develop a model of the effect to quantitatively estimate the impact on the Euclid mission
Nersisyan, Henrik [Verfasser], and Luca [Akademischer Betreuer] Amendola. "Infrared Nonlocal Gravity Theories : Optimizing Science Return to Euclid Satellite Mission / Henrik Nersisyan ; Betreuer: Luca Amendola." Heidelberg : Universitätsbibliothek Heidelberg, 2017. http://d-nb.info/117801066X/34.
Повний текст джерелаGuinot, Axel. "Weak lensing analysis of the Canada-France Imaging Survey : from pixels to cosmology, preparation for the Euclid mission." Thesis, Université de Paris (2019-....), 2020. http://www.theses.fr/2020UNIP7106.
Повний текст джерелаAmong the big questions cosmology faces today, the nature of dark matter and dark energy are at the center of upcoming surveys. The future stage IV missions Euclid and LSST will cover a surface on the sky never reached before to unveil structures at very large scales and different epochs. Weak gravitational lensing will be one of the cosmological probes used to trace dark matter. Gravitational lensing is a physical phenomenon which uses the distortion of light to trace the presence of mass in the Universe. The interesting point of weak lensing is its sensitivity to total mass, i.e. baryonic and non-baryonic. Due to gravitational lensing, distant galaxies will appear distorted on the observed images. The measurement of the distortions induced by gravitational shear requires a very accurate estimation of the shape of galaxies. This thesis will present the data reduction pipeline built for weak lensing studies, from the telescope to cosmological parameter inference. The work focuses on the analysis of the Canada-France Imaging Survey (CFIS), a u- and r-band survey covering 5,000 deg2 in the Northern hemisphere. The high resolution and depth of those data make it one the best survey candidates for weak lensing science to date. Among other things, accurate measurement of the shape galaxies requires a very good knowledge of the PSF for which a suite of validation tests have been developed. Due to the noise, and approximations used in the shape measurement, the results can be biased. The residual multiplicative and additive biases have been reduced to m < 0.1% and c < 0.001% respectively by using state-of-art techniques such as Metacalibration. This thesis will also present the work that is required for the development of a weak lensing pipeline, such as the elaboration of highly accurate and data-representative image simulations. We will show validation tests performed to ensure systematic-free measurements. Finally, preliminary science results will be presented demonstrating the viability of the pipeline. We have constructed maps of dark matter over a surface of 2,000 deg2. We have measured tangential shear around 50 clusters and compared to theoretical predictions. To conclude, we will present a first 3x2 points analysis combining the weak lensing study performed on CFIS and the redshift measurement from eBOSS observations on the 50 deg2 chosen for science verification purposes
Laudisio, Fulvio. "Verification and integration of the management and control software for the Near Infrared Spectrometer Photometer of the Euclid space mission." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3426230.
Повний текст джерелаQuesta tesi è divisa in cinque capitoli, che descrivono i diversi elementi e le fasi del lavoro svolto durante il periodo di Dottorato. Nel primo capitolo c'è un introduzione alla missione spaziale Euclid, e la descrizione dei suoi obiettivi scientifici, e degli strumenti progettati per completare la missione. Il payload della missione è un telescopio per l' osservazione dello spazio che monta due camere capaci di acquisire immagini su diverse lunghezze d'onda. In particolare è descritto lo Spettro Fotometro Infrarosso (NISP). Nel secondo capitolo c'è una dettagliata descrizione dell' elettronica che controlla il NISP. L' integrazione e i test sue queste schede elettroniche (AIV) è il principale soggetto di questo studio. Il mio contributo alle attività di AIV e la filosofia sottostante a tali attività sono descritti nel capitolo tre. È descritto il piano di test seguito e gli strumenti software sviluppati per questo scopo. Le attività Assemblaggio Integrazione e Verifica hanno richiesto una attenta progettazione di diversi software e dei metodi per verificarli. In particolare per lo sviluppo di un componente software usato nei test della DPU. Questo lavoro è stato svolto, congiuntamente ai gruppi NISP AIV/AIT e NISP EGSE e le industrie coinvolte (OHB Italia per le DPU e TEMIS per la fornitura di parte dell' equipaggiamento) ed è stato consegnato alle industrie per la validazione dei modelli di volo degli strumenti. La campagna di test della DPU è descritta nel capitolo quattro. Abbiamo contribuito all' integrazione dell' Application Software della DPU in due fasi svoltesi nei laboratori di OHB-I e nell' INAF di Padova. Nel capitolo cinque sono descritte le attività di AIV svolte per la validazione del modello AVM del NISP che doveva essere completata prima della consegna dello strumento a Thales Alenia Space.
Holmes, Rory [Verfasser], and Hans-Walter [Akademischer Betreuer] Rix. "The Near-Infrared Imaging Channel for the Euclid Dark Energy Mission : Development of Critical Opto-Mechanical Components and an Instrument Calibration Concept / Rory Holmes ; Betreuer: Hans-Walter Rix." Heidelberg : Universitätsbibliothek Heidelberg, 2012. http://d-nb.info/1179783336/34.
Повний текст джерелаSilvi, Andrea. "Cosmologia con missione spaziale "Euclid"." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7691/.
Повний текст джерелаPinelli, Daniele. "Validazione del codice per l'analisi cosmologica della missione Euclid." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24232/.
Повний текст джерелаGuglielmi, Luca. "Nuclei galattici attivi: proprietà e caratterizzazione mediante diagrammi diagnostici nell'epoca della missione Euclid." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24276/.
Повний текст джерелаPrincipi, Nicola. "Stima della matrice di covarianza dei multipoli della funzione di correlazione per la missione spaziale Euclid." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24256/.
Повний текст джерелаProietti, Fabio. "Piattaforma hardware a basso costo a supporto dello sviluppo di software per la missione ESA-Euclid." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13735/.
Повний текст джерелаBenati, Alessandro. "Validazione dei codici per la misura della funzione di correlazione a due punti per la missione spaziale Euclid." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23894/.
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