Hubble Frontier Field Abell 2744
This long-exposure Hubble Space Telescope image of massive galaxy cluster
Abell 2744 (foreground) is the deepest ever made of any cluster of galaxies. It
shows some of the faintest and youngest galaxies ever detected in space.
The immense gravity in Abell 2744 is being used as a lens to warp space and
brighten and magnify images of more distant background galaxies. The more
distant galaxies appear as they did longer than 12 billion years ago, not long
after the big bang.
The Hubble exposure reveals almost 3,000 of these background galaxies
interleaved with images of hundreds of foreground galaxies in the cluster. Their
images not only appear brighter, but also smeared, stretched and duplicated
across the field. Because of the gravitational lensing phenomenon, the
background galaxies are magnified to appear as much as 10 to 20 times larger
than they would normally appear. Furthermore, the faintest of these highly
magnified objects is 10 to 20 times fainter than any galaxy observed previously.
Without the boost from gravitational lensing, the many background galaxies would
be invisible.
The Hubble exposure will be combined with images from Spitzer and NASA's
Chandra X-ray Observatory to provide new insight into the origin and evolution
of galaxies and their accompanying black holes.
Image Credit: NASA/ESA
Guillermo Gonzalo Sánchez Achutegui
ayabaca@gmail.com
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