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OUR BEAUTIFUL UNIVERSE: Into the blue

Published on Thursday, 01 February 2018 17:12

OBU-BlueMassMassive galaxy cluster RCS2 J2327. (ESO, ESA/Hubble & NASA)

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 x 1015 solar masses in total. They showed that a ground-based method using Ks 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.

This image was published in the February 2018 issue of Astronomy & Geophysics.

 

More information

www.eso.org/public/images/potw1752a