Résumé / Abstract

Cours de l'IAP / Lectures of the IAP

«  Gravitational lensing, from planets to clusters of galaxies 5  »

Christophe Alard
Institut d'Astrophysique de Paris (Paris, France)

Lecture 5 : Strong lensing: arcs at the galaxy or small groups of galaxies scale

5.1) Basic physics of gravitational arcs
5.1.1) Simple examples using elliptical potentials
5.1.2) Illustrations using real systems
5.1.3) The problem of the degeneracy of the modeling of gravitational arcs

5.2) What is the information that can be extracted from gravitational arcs ?
5.2.1) How to overcome the degeneracy issue
5.2.2) Arcs as a perturbation of a singular situation
5.2.3) Description of arcs by fundamental fields

5.3) Modeling of arcs using the singular perturbative approach
5.3.1) Geometrical properties of halos related to the singular perturbative approach
5.3.2) Separation of the inner and outer contributions of the lens to the potential
5.3.3) Iterative reconstruction of the fields

5.4) Practical implementation of the singular perturbative approach
5.4.1) Basic framework
5.4.2) Application to galactic lenses
5.4.3) Application to small group of galaxies

5.5) Statistical approach using the singular perturbative approach
5.5.1) Statistical description of the lenses using the perturbative fields 5.5.2) Associated statistics of the dark matter halo
5.5.3) Prospective application and possibilities offered by Euclid

Full program at

Slides of the lecture
lundi 7 février 2022 - 15:00
Amphithéâtre Henri Mineur, Institut d'Astrophysique
Page web des cours / Lectures' webpage