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Posted by on Sep 20, 2012 in Science |

MACS 1149-JD: the galaxy formed 200 million years after the Big Bang

MACS 1149-JD: the galaxy formed 200 million years after the Big Bang

A team of researchers in Europe and the United States has discovered the MACS 1149-JD, one of the oldest known to date formed 200 million years after the Big Bang . A milestone when you consider that the reionization would date a lack of exploration time, outside the sensitivity of the telescopes.

The researchers say that would consist of a cluster of stars at 13.2 billion light years away. According to the research team:

We estimate that the galaxy was formed less than 200 million years after the Big Bang.

And is that so far astronomers have found about 100 galaxies that are believed formed between 650 and 850 million years after the birth of the cosmos. Only one, discovered last year, could safely be dated 500 million years later.

Detection of means a breakthrough for the techniques used in tracking such distant galaxies. The main problem for astronomers is that its brightness is very weak and difficult to detect from Earth telescopes.

And how they got it? The astronomers used the phenomenon known as gravitational lensing to detect light. Galaxies that are grouped in a small arc of the sky containing a large amount of dark matter, the mysterious stuff that until now could only be perceived indirectly. Through gravitational lensing produced by the galaxy cluster was in the light path of MACS 1149-JD, the galaxy could be detected.

An achievement that has been able through the Hubble and Spitzer space telescopes.

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