TY - GEN
T1 - Constraining the halo size of galaxies in cluster cores through strong lensing analysis
AU - CLASH Team
AU - Monna, Anna
AU - Seitz, Stella
AU - Zitrin, Adi
AU - Geller, Margaret J.
N1 - Publisher Copyright:
Copyright © 2018 by the Editors.All rights reserved.
PY - 2018/1/1
Y1 - 2018/1/1
N2 - 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.
AB - 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.
KW - Dark matter
KW - Galaxy cluster
KW - Galaxy halos
KW - Gravitational lensing
UR - http://www.scopus.com/inward/record.url?scp=85059059557&partnerID=8YFLogxK
U2 - 10.1142/9789813226609_0383
DO - 10.1142/9789813226609_0383
M3 - Conference contribution
AN - SCOPUS:85059059557
T3 - 14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings
SP - 3031
EP - 3036
BT - 14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings
A2 - Bianchi, Massimo
A2 - Jantzen, Robert T
A2 - Ruffini, Remo
A2 - Ruffini, Remo
PB - World Scientific Publishing Co. Pte Ltd
T2 - 14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories
Y2 - 12 July 2015 through 18 July 2015
ER -