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A gallery of gravitational arcs This mosaic shows a subset of the sample of new gravitational lenses discovered in the CFHTLS and illustrating the broad range of masses probed by the excellent images gathered at CFHT. In addition to the very massive clusters and compact galaxies, a large number of intermediate mass lenses are seen for the first time.
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A galaxy group lens
This example of a galaxy group lens in the CFHTLS-SL2S,
called SL2SJ021408-053532, shows a very complex arc structure (in
blue).
©
Canada-France-Hawaii
Telescope Corporation 2006
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Giant arcs around a massive cluster galaxy
This is a spectacular example of giant arcs around a massive
cluster
galaxy (SL2SJ085446-012137). © Canada-France-Hawaii
Telescope Corporation 2006
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A very bright ringlet configuration
This very bright ringlet configuration (SL2SJ021737-051329)
is actually a group of multiple images of a single source, called cusp
arcs,
merged together in a single arc on the ground-based images. © Canada-France-Hawaii
Telescope Corporation 2006
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A piece of History
Abel 370 in 1985 This picture if the first image of a giant gravitational arc,
found in a massive nearby cluster calleb Abel 370. It first appeared in January
1987, 20 years ago, in the following article: The gravitational lensing origin of the arc was recognized ten
months later in: © Canada-France-Hawaii
Telescope Corporation 2006
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Another piece of History
Abel 370 in 1990
Here is the same image with a slightly higher resolution © Canada-France-Hawaii
Telescope Corporation 2006
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CFHT - The telescope with MegaPrime/MegaCam
The Canada-France-Hawaii telescope structure is based on an equatorial
mount design, with one of the axis of rotation set parallel to the axis
of the Earth¹s rotation. The mirror cell (the white circular
structure
at the bottom of the telescope, seen just above the person giving the
scale
on this photograph) holds and protects the most precious element: the
3.6-meter
diameter mirror. © Canada-France-Hawaii
Telescope Corporation 2006
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All images on this page are to be used
exclusively for
the purpose of media announcements
related to Strong Lensing in the CFHT Legacy Survey (Dec 2006)
For any other use, please seek authorization from CFHT's PR
officer .