University of Birmingham > Talks@bham > Astrophysics Seminars > Hubble Frontiers Fields : Some insights after 2 and half years of observation

Hubble Frontiers Fields : Some insights after 2 and half years of observation

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If you have a question about this talk, please contact Sean McGee.

The Hubble Frontier Fields (HFF) initiative constitutes the largest commitment ever of HST time to the exploration of the distant Universe via gravitational lensing by massive galaxy clusters. This program devotes 140 orbits of HST time to deep imaging observations of each of six cluster lenses reaching m~29 (AB) uniformly from the optical to the near-infrared. These clusters were chosen for their strong lens properties, and are all highly disturbed objects, showing major and minor merging on-going processes, making them ideal targets to trace the Cosmic Web assembly. While combining strong and weak-lensing regimes to map the total mass with X-rays observations of the hot gas and spectroscopy of cluster galaxies to look at their direction of motion, we can thus study the dynamical scenarios in place within these massive galaxy clusters, and trace the sub-structures engaged. I will present a new multi-wavelength picture of the first two HFF clusters. The depth of these dataset makes these clusters amazing Cosmic Telescopes, but also enables us to get an unprecedented understanding of the cluster physics. I will present a comparison of the dark matter, light and gas distributions, that will lead us to the distribution of substructures within the MACSJ0416 , and Abell 2744 vicinities. Finally I will discuss the different clues that these observables provide on the evolution processes in massive galaxy clusters.

If time permits, I will discuss one of the most beautiful HFF discovery, SN Refsdal, the first multiply-lensed supernovae discovered by Kelly et al. (2015) in MACSJ1149 . This particular event is a rare chance to test our mass modeling techniques, and hopefully improve our methods. I will thus give an overview of the lensing community’s work on SN Refsdal, and discuss the appearance of its last multiple image.

This talk is part of the Astrophysics Seminars series.

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