The Astrophysical Journal by Pascal Oesch of Yale University and his co-authors have reported an interesting discovery. Astronomers can look at the galaxy in its beginnings using the new measurements. Despite of its relative infancy, it’s already about one-sixth as huge as the Milky Way— which is a 10-billion-year-old galaxy— and it is getting larger, making stars 80 times faster than the Milky Way is making them today.
As directed by the rules of the expanding universe, a galaxy is fast withdrawing from us when it is farther away which is measured by the “redshift” of its light being widened to longer wavelengths in such a way that an ambulance siren seem like to lower its pitch as it goes by.
In the preceding years, galaxies have been found as they appeared even closer as astronomers have competed with each other using instruments such as Hubble Space Telescope. On the other hand, the measurements were estimated based on the colors of the objects known as photometric redshifts.
The new galaxy held out in a survey of aloof galaxies by the Hubble and Spitzer space telescopes called as Candels, for Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey. With a powerful spectrograph known as Mosfire which stands for Multi-Object Spectrometer for Infrared Exploration, its redshift was accurately measured on Keck 1, one of a pair of 10-meter-diameter telescopes on Mauna Kea in Hawaii. According to one of the astronomers in the study, Garth Illingworth of the University of California, Santa Cruz, it’s the highest redshift has been recorded in this way.
An upcoming generation of instruments such as the James Webb Space Telescope and the Thirty Meter Telescope— a goliath planned for Mauna Kea, already home to a dozen telescopes— will soon be used to study how these galaxies were able to form and mature so quickly after the lights came on in the universe which is still considered as a mystery.
Lately, on the other hand, a $1.4 billion project— the construction of the Thirty Meter Telescope— has been ceased by disapprovals by the residents in Hawaii who believed that their mountain has been abused. Dr Oesch and his colleagues wrote an echo of that dispute which was published in the new paper testifying, “The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.”