Constraining the halo size of galaxies in cluster cores through strong lensing analysis

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

We combine strong gravitational lensing (SL) analysis of galaxy clusters' core with measurements of cluster members' velocity dispersion to investigate the matter content of galaxies in clusters. While lensing usually constrains the overall, projected mass density, the innovative use of velocity dispersion measurements as a proxy for masses of individual cluster members breaks inherent degeneracies and allows us to refine the constraints on single galaxy masses, on the galaxy mass-to-light scaling relation, and as a result to refine the constraints on the cluster dark matter map, a high-end goal of lens modelling. We present the SL analysis of the core of the galaxy cluster Abell 383, in which we use velocity dispersion measurements of 21 individual cluster members, obtained with MMT's Hectospec. The knowledge of cluster member velocity dispersions improves the fit by 20% in terms of the rms of the image reproduction, while constraints on the mass parameters improve by ∼ 10% for the DH and by ∼ 50% for the galaxy component. We find that galaxies in cluster cores have DM halos highly truncated, which is consistent with numerical simulations predictions. Moreover, stronger constraints on the mass profiles of individual galaxies are obtained by performing the surface brightness reconstruction of the southern giant arc.

Original languageAmerican English
Title of host publication14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings
EditorsMassimo Bianchi, Robert T Jantzen, Remo Ruffini
PublisherWorld Scientific Publishing Co. Pte Ltd
Pages3031-3036
Number of pages6
ISBN (Electronic)9789813226593
DOIs
StatePublished - 1 Jan 2018
Externally publishedYes
Event14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories - Rome, Italy
Duration: 12 Jul 201518 Jul 2015

Publication series

Name14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings

Conference

Conference14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories
Country/TerritoryItaly
CityRome
Period12/07/1518/07/15

Keywords

  • Dark matter
  • Galaxy cluster
  • Galaxy halos
  • Gravitational lensing

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics

Fingerprint

Dive into the research topics of 'Constraining the halo size of galaxies in cluster cores through strong lensing analysis'. Together they form a unique fingerprint.

Cite this