Some of the most distant objects in the universe have been revealed by the Hubble Space Telescope, using what are known as "focusing lenses".
Avi Blizovsky
Some of the most distant objects in the universe have been revealed by the Hubble Space Telescope, using what are known as "focusing lenses".
The Advanced Camera for Surveys (ACS) installed on the Hubble in February 2002 is five times more sensitive and allows images twice as sharp as the previous Hubble cameras. Some of the newly discovered objects are twice as faint as those seen by the Hubble Deep Field Camera in the mid-13s and are XNUMX billion light-years away. Although further analyzes are needed, these objects are almost certainly galaxies observed in the process of their formation.
In order to obtain these images, the Hubble Space Telescope had to be fixed for 13 hours to the galaxy cluster
Abell 1689, which is 2.2 billion light years away from us. The huge field of attraction of the field acts like a magnifying glass and enables the viewing of much more distant objects that are behind it. The typical magnification is between 5 times 30 and thus distant objects reach the field of view of the ACS.
"This is an important technique because it allows us to look further than usual and explore the distant universe," said Peter Jacobsen of the European Space Agency, which is a partner in the Hubble Space Telescope.
The astronomers will also be able to map the distribution of dark matter in the cluster used for the Haggadah, by observing the effect of the attraction of the matter on the images of the distant objects.
Since we only have a little idea of what dark matter is, if we can show how it affects it, that could give us clues, says Jacobsen, a project scientist for the James Webb Telescope that NASA will launch in 2010. "The next telescope will follow the work of Hubble, saying. "We hope to be able to see the early galaxies without gravitational lensing. However, we can still play the same game and look at this cluster to see even earlier objects.
Yadan Astrophysics 2 - stars and galaxies
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