Group of galaxies found to bend the light of remote galaxies

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This example of a galaxy group lens in the CFHTLS-SL2S called SL2SJ021408-053532 shows a very complex arc structure (in blue). Such complex arc geometries allow us to probe the details of the dark matter profiles associated with the group of yellow g ...
This example of a galaxy group lens in the CFHTLS-SL2S, called SL2SJ021408-053532, shows a very complex arc structure (in blue). Such complex arc geometries allow us to probe the details of the dark matter profiles associated with the group of yellow galaxies in the center of the image. © Canada-France-Hawaii Telescope Corporation 2006

The discovery of a new class of gravitational lenses, the groups of galaxies, by an international team of astronomers using the Canada-France-Hawaii Legacy Survey (CFHTLS), comes 20 years after the publication in January 1987 of the first image of a gravitational arc, made also at CFHT with one of the first CCD cameras in operation at an observatory.


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