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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/22039

Title: Testing light-traces-mass in Hubble Frontier Fields Cluster MACS-J0416.1-2403
Authors: Sebesta, Kevin
Williams, Liliya L.R.
Mohammed, Irshad
Saha, Prasenjit
Liesenborgs, Jori
Issue Date: 2016
Citation: Monthly notices of the Royal Astronomical Society, 461(2), p. 2126-2134
Abstract: We reconstruct the projected mass distribution of a massive merging Hubble Frontier Fields cluster MACSJ0416 using the genetic algorithm based free-form technique called Grale. The reconstructions are constrained by 149 lensed images identified by Jauzac et al. using HFF data. No information about cluster galaxies or light is used, which makes our reconstruction unique in this regard. Using visual inspection of the maps, as well as galaxy-mass correlation functions we conclude that overall light does follow mass. Furthermore, the fact that brighter galaxies are more strongly clustered with mass is an important confirmation of the standard biasing scenario in galaxy clusters. On the smallest scales, approximately less than a few arcseconds, the resolution afforded by 149 images is still not sufficient to confirm or rule out galaxy-mass offsets of the kind observed in ACO 3827. We also compare the mass maps of MACSJ0416 obtained by three different groups: Grale, and two parametric Lenstool reconstructions from the CATS and Sharon/Johnson teams. Overall, the three agree well; one interesting discrepancy between Grale and Lenstool galaxy-mass correlation functions occurs on scales of tens of kpc and may suggest that cluster galaxies are more biased tracers of mass than parametric methods generally assume.
URI: http://hdl.handle.net/1942/22039
DOI: 10.1093/mnras/stw1433
ISI #: 000383273600074
ISSN: 0035-8711
Category: A1
Type: Journal Contribution
Validation: ecoom, 2017
Appears in Collections: Research publications

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