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Identifier	000456422
Title	Comparison of mass-mapping techniques using weak gravitational lensing: application to the UNIONS galaxy survey
Alternative Title	Σύγκριση μεθόδων χαρτογράφησης μάζας με τη χρήση φαινομένων ασθενών βαρυτικών φακών: εφαρμογή στη γαλαξιακή έρευνα UNIONS
Author	Τερσένοβ, Ανδρέας Α.
Thesis advisor	Παυλίδου, Βασιλική Starck, Jean-Luc
Abstract	Weak gravitational lensing, the distortion of images of high-redshift galaxies due to foreground matter structures on large scales, is one of the most promising tools of cosmology to probe the dark sector of the Universe. Using the patterns of lensing distortions derived from galaxy shapes, maps of the underlying matter distribution can be obtained. Such maps contain a wealth of information about the distribution of dark matter on large scales, and the origin of the accelerated expansion of the Universe. The aim of this thesis is to study and compare various state-of-the-art map-making methods, namely Kaiser-Squires, Wiener filter, Sparse Recovery and MCALens. In addition, those techniques were applied to the CFIS (Canada-France Imaging Survey) part of the UNIONS (Ultraviolet Near-Infrared Optical Northern Sky) galaxy survey, an ongoing large imaging survey ideally suited for weak lensing. To date CFIS has covered 4300 deg2 in the Northern hemisphere in multiple optical bands from various telescopes in Hawaii.The observed data are an integral part of the imaging survey obtained by the European satellite mission Euclid, to be launched in 2023, and these weak-lensing maps will be valuable for subsequent cosmological analyses. Finally, this work further applies peak counting to one of the generated mass maps and, by comparing with simulations, provides constraints on the cosmological parameters, Ωm (matter density parameter), As (primordial power spectrum), and Mν (sum of neutrino masses).
Language	English
Subject	Mass mapping
	UNION/CFIS
	Ασθενής βαρυτικός φακός
Issue date	2023-07-28
Collection	School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses
	Type of Work--Post-graduate theses
Permanent Link	https://elocus.lib.uoc.gr//dlib/7/0/3/metadata-dlib-1687241448-549835-9261.tkl
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