TY - JOUR
T1 - Testing light-traces-mass in Hubble Frontier Fields Cluster MACS-J0416.1-240
AU - Sebesta, Kevin
AU - Williams, Liliya L.R.
AU - Mohammed, Irshad
AU - Saha, Prasenjit
AU - Liesenborgs, Jori
N1 - Publisher Copyright:
© International Astronomical Union 2016.
PY - 2015
Y1 - 2015
N2 - 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.
AB - 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.
KW - Cosmology
KW - gravitational lensing
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U2 - 10.1017/S1743921316006827
DO - 10.1017/S1743921316006827
M3 - Article
AN - SCOPUS:84992650822
SN - 1743-9213
VL - 11
SP - 785
EP - 786
JO - Proceedings of the International Astronomical Union
JF - Proceedings of the International Astronomical Union
IS - A29B
ER -