Researchers have recently reported that the galaxy, “z8_GND_5296”, is still the oldest found galaxy known to humanity.
z8_GND_5296 is found to be formed just 700 million years after the birth of our universe that is thought to be formed about 13.7 billion years ago.
For this discovery, astronomers used more sensitive instrument on the Keck I telescope see the lyman-alpha emission of one galaxy with a redshift of 7.51 showing the time when the universe was only 700 years old. Only five galaxies have been found in the redshift of greater than 7 (at z = 7.008, 7.045, 7.109, 7.213 and 7.215). This new discovery is the new record.
“This galaxy’s colours are consistent with significant metal content, implying that galaxies become enriched rapidly,” Researchers wrote.
Researchers have found that the galaxy is producing new stars at a much faster rate than the modern galaxies such as our milky way.
“We calculate a surprisingly high star-formation rate of about 330 solar masses per year, which is more than a factor of 100 greater than that seen in the Milky Way. Such a galaxy is unexpected in a survey of our size, suggesting that the early Universe may harbour a larger number of intense sites of star formation than expected,” Researchers wrote.
S. L. Finkelstein et al. (2013). A galaxy rapidly forming stars 700 million years after the Big Bang at redshift 7.51 Nature DOI: 10.1038/nature12657