Thursday, October 24, 2013

Space: Age of distant galaxy so far confirmed - Times Online

Pretty old and pretty far away: The Galaxy z8_GND_5296 breaks all records. Their light comes from a time when the universe was only 700 million years old.

class=”articlemeta-date”> 24 October 2013


The detail shows the galaxy z8_GND_5296 enlarged in an image from the Hubble Space Telescope. | © V. Tilvi / p Finkelstein / Candels Team / HST / NASA

astronomers have discovered the most distant galaxy so far. 13.1 billion years took their light to reach the telescopes of the researchers. Thus the galaxy z8_GND_5296 is the oldest star formation, which has been shown to report Steven Finkelstein of the University of Texas at Austin and colleagues in the journal Nature .

While there are a handful of star clusters that could win the prize of the oldest galaxy in the universe. However, their existence is not yet officially confirmed. The distance of a galaxy is determined using its light spectrum, strictly on the basis of a bright line that stands out clearly from it. You will gennant Lyman-alpha line. With the expansion of the universe, this line expands and appears more reddish, the farther away a galaxy is. Therefore, researchers speak of the “red shift”.


Few galaxies have been spectroscopically confirmed its redshift is greater than seven and the date from the early years of the universe. For z8_GND_5296 Finkelstein’s team identified now with a spectrograph on the Keck 1 telescope in Hawaii, the highest confirmed value of 7.51.

It is therefore clear that the light from the star formation was emitted just 700 million years after the Big Bang. Their analysis also shows that the distant galaxy produces a surprising pace of new stars – more than a hundred times faster than our own, the Milky Way. “From this we learn something about the young universe,” said Finkelstein. “There are many more sites with very high star formation rate than we previously thought.”


the galaxy was at a record-sky survey of the Hubble Space Telescope. A total of 43 candidates had studied the team closer, but to recognize only the Lyman-alpha line of z8_GND_5296war well.

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