Probing the nature of dark matter with the power spectrum of small-scale mass structure in massive elliptical lens galaxies

Dorota Bayer

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Whereas the predictions from the phenomenological dark-matter models are practically indistinguishable with respect to the expected number of individual massive sub-galactic structures, the critical difference lies in the abundance and the population characteristics of substructures with lower masses. The phenomenon of the galaxy-galaxy strong gravitational lensing provides a unique opportunity to search for such low-mass substructures inside galaxies that happen to act as gravitational lenses on more distant galaxies, serendipitously located along the same line of sight. In this thesis, we present a novel statistical approach to investigate the collective perturbative effect of these low-mass sub-galactic structures on the lensed images of the background galaxies, such as Einstein rings or gravitational arcs. Our approach is based on Hubble Space Telescope (HST) observations of galaxy-galaxy strong gravitational lens systems, the subsequent computational modelling of the observed gravitational-lensing effect and, finally, the Fourier analysis of the anomalies revealed in the lensed images.
Originele taal-2English
KwalificatieDoctor of Philosophy
Toekennende instantie
  • Rijksuniversiteit Groningen
Begeleider(s)/adviseur
  • Koopmans, Léon, Supervisor
  • McKean, John, Supervisor
  • Vernardos, Giorgos, Co-supervisor
Datum van toekenning18-jan.-2021
Plaats van publicatie[Groningen]
Uitgever
DOI's
StatusPublished - 2021

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