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Testing light-traces-mass in Hubble Frontier Fields Cluster MACS-J0416.1-240

Published online by Cambridge University Press:  27 October 2016

Kevin Sebesta ,
Liliya L. R. Williams ,
Irshad Mohammed ,
Prasenjit Saha  and
Jori Liesenborgs
Kevin Sebesta
Affiliation:
School of Physics & Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455, USA email: [email protected], [email protected]
Liliya L. R. Williams
Affiliation:
School of Physics & Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455, USA email: [email protected], [email protected]
Irshad Mohammed
Affiliation:
Physik-Institut, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland Institute for Computational Science, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
Prasenjit Saha
Affiliation:
Physik-Institut, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland Institute for Computational Science, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
Jori Liesenborgs
Affiliation:
Expertisecentrum voor Digitale Media, Universiteit Hasselt, Wetenschapspark 2, B-3590, Diepenbeek, Belgium
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Abstract

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We reconstruct the projected mass distribution of a massive merging HFF 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, ≲ 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.

Keywords

Cosmologygravitational lensing
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29B: Astronomy in Focus , August 2015 , pp. 785 - 786
Copyright
Copyright © International Astronomical Union 2016 

References

Jauzac, et al. 2014, MNRAS, 443, 1549 Google Scholar
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Koda, et al. 2015, ApJL 807, L2 CrossRefGoogle Scholar
Liesenborgs, J., de Rijcke, S., Dejonghe, H., & Bekaert, P. 2009, MNRAS, 397, 341 Google Scholar