Photometric redshift estimations in large multi-wavelength surveys and application to galaxy cluster property studies

Diplôme Thèse Photometric redshift estimations in large multi-wavelength surveys and application to galaxy cluster property studies eng 2022-03-18 2022-03-29 author Desprez Guillaume 826782 director Paltani Stéphane 27695 10.13097/archive-ouverte/unige:160101 urn:nbn:ch:unige-1601014 Sc. 5647 The redshift is an observable quantity which is linked to both the distances that separate us from extragalactic sources and to the Universe’s cosmology. To constrain the nature of the dark universe (i.e., dark energy and dark matter) large cosmological surveys, such as the Euclid survey, require measuring redshifts for billions of galaxies. Such kind of mission must rely on photometric redshifts, which in return must have the best precision and accuracy possible. I this thesis, I worked on the validation and the improvements of the photometric redshift measurement methods planned for Euclid mission. I also explored novel methods to extract the photometry in large survey images, and to combine the data of different surveys in a configuration close to the expected Euclid one. Moreover, I investigated the possibility to use such kind of data to study the evolution of galaxies in dense environments. Photometric redshifts Galaxy evolution Cosmology Photometry Large surveys Dewey 520 26 Département d'astronomie 12 false ac88382c-9def-4a75-bc28-67d9188b92ec Thesis Public Desprez_ThesisManuscript.pdf 39479011 application/pdf CC0 openAccess Faculté des sciences / Département d'astronomie

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Desprez, Guillaume

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