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Title Search for gravitational lens system candidates at milli-arcsecond scales using EVN data at 5 and 22 GHz
Author Καλαϊτζιδάκης, Γεώργιος
Thesis advisor Casadio, Carolina
Abstract The principal aim of the work presented in this thesis is the verification of strong gravitational lens candidates within a catalogue of compact radio sources. This study is part of the Search for MIlli-LEnses (SMILE) project, focused on the search for gravitational lens systems on milliarcsecond scales, using Very Long Baseline Interferometry (VLBI) data at radio frequencies. In the work presented here, we initially selected milli-lens candidates from the publicly available Astrogeo database, and we observed them with the European VLBI Network (EVN) at 5 and 22 GHz. We obtained the radio images of these sources and analyzed a number of physical quantities that we expect to help us judge whether a source is a gravitational lens system or not. Out of the 16 sources that were studied in this work, 3 passed all tests and are still considered as valid candidates. Additional follow-up studies are needed to prove whether they are indeed gravitational lens systems.
Language English
Issue date 2023-07-28
Collection   School/Department--School of Sciences and Engineering--Department of Physics--Graduate theses
  Type of Work--Graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/5/c/9/metadata-dlib-1687503481-205322-7264.tkl Bookmark and Share
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