NEWS llionat a tevinsinggra This image of massive galaxy cluster RCS2 J2327 combines Hubble Space Telescope images with the mass distribution superposed as a diffuse blue and white image. Arc-like distorted images of distant galaxies can be seen in the midst of the galaxy cluster, but it is the distortions arising from weak gravitational lensing that Tim Schrabback of the University of Bonn and colleagues used to map the mass – 2 × 10 M in total. They showed that a ground-based method using K data from the HAWK-1 instrument on the European Southern Observatory’s Very Large Telescope, with Large Binocular Telescope photometry, can work as well as weak lensing based on HST mosaics. (ESO, ESA/Hubble & NASA) http://www.eso.org/public/images/potw1752a 1.6 A&G • February 2018 • Vol. 59 • aandg.org Downloaded from https://academic.oup.com/astrogeo/article-abstract/59/1/1.6/4804271 by Ed 'DeepDyve' Gillespie user on 16 March 2018
Astronomy & Geophysics – Oxford University Press
Published: Feb 1, 2018
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