Image taken by the Hubble ‘Hubble’ region of the sky where the galaxy z8-GND- 5296 (enlarged), which is the farthest confirmed until now. / V. TILVI (TEXAS A & M) / S. FINKELSTEIN (UT AUSTIN) / CANDELS TEAM / HST / NASA
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most distant galaxy so far detected is called z8-GND-5296 and its light has taken 13,000 million years to reach us from being issued. Astronomers therefore see it now as it was when they had gone only a little over 700 million years after the Big Bang. No other galaxies candidate record distance, but not confirmed, as this now by spectrometric techniques, namely its light analysis. Astronomers have measured the calculated also being created stars to rate it really high: about 300 annually, while in our Milky Way are formed one or two as the sun a year. Steven Finkelstein (University of Texas at Austin) and their colleagues explain in the journal Nature how they have investigated a total of 43 possible remote galaxies and only one of them has proved to be such a huge distance.
“The search for the most distant objects in the known Earth is important to improve our understanding of the history of the universe and needed to find the first generation of galaxies formed after the Big Bang,” said Dominick A. Riechers (Cornell University) in Nature commenting on the scope of this discovery.
The age of the universe has been established by the Planck space telescope in 13,800 million years, so if the light of z8-GND-5296 now reaching telescopes on Earth has been traveling more than 13,000 million years, when the cosmos was issued about 5% of its current age. Since the universe is expanding from the Big Bang, researchers estimate that the galaxy is already now about 30,000 million light years away from us.
spectrometric observations scientists can estimate the distance of distant objects in the sky by comparing the wavelengths emitted by a given atom with those observed from the distant galaxy. Traveling in an expanding universe, the waves have been dragging like wrinkles estirase cloth one. Called redshift effect (the longer waves detectable by the human eye), which will be higher the farther away the galaxy observed.
Finkelstein and colleagues, based on data taken with Hubble Space Telescope , selected 43 candidate galaxies for your search. With a new advanced spectrometer installed in one of the Keck telescopes (in Hawaii) have been determined for 5296 z8-GND-worth redshift of 7.51 (which translates into 13,000 million years these distance traveled by light of the galaxy). “Only five other galaxies have confirmed redshifts greater than 7, with the previous record set in 7215″, experts emphasize the University of Texas A & M who have participated in the study.
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