Scientists discover oldest and farthest galaxy till date, located 13.4 billion light-years

Astromers have discovered what y think is farst and oldest galaxy ever observed using Keck I telescope. Termed as ‘GN-z11’, galaxy is so distant that it defines ‘observable universe itself’, says press release by University of Tokyo. With this finding, researchers aim to establish a period of cosmological history when universe was only a few hundred million years old. research was led by bunari Kashikawa, a professor in department of astromy at University of Tokyo. 

A new discovery 

Talking about this venture, Kashikawa said, “From previous studies, galaxy GN-z11 seems to be farst detectable galaxy from us, at 13.4 billion light-years, or 134 nillion kilometers (that’s 134 followed by 30 zeros),” said Kashikawa. “But measuring and verifying such a distance is t an easy task”. As a part of research, Kashikawa and his team also measured   redshift of GN-z11. This is way light stretches out, becomes redder, farr it travels. Also, emission lines imprint distinct patterns in light from distant objects. 

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“We looked at ultraviolet light specifically, as that is area of electromagnetic spectrum we expected to find redshifted chemical signatures. Hubble Telescope detected signature multiple times in spectrum of GN-z11. However, even Hubble cant resolve ultraviolet emission lines to degree we needed. So we turned to a more up-to-date ground-based spectrograph, an instrument to measure emission lines, called MOSFIRE, which is mounted to Keck I telescope in Hawaii”, said Kashikawa.

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MOSFIRE helped in capturing emission lines from GN-z11 in detail. This helped team in determining a much better estimation on its distance. accuracy was furr improved by galaxy’s z value by a factor of 100. Kashikawa was furr accompanied by Linhua Jiang, bunari Kashikawa, Shu Wang, Gregory Walth, Luis C. Ho, Zheng Cai, Eiichi Egami, Xiaohui Fan, Kei Ito, Yongming Liang, Daniel Schaerer and Daniel P. Stark. work has been published in journal Nature Astromy.

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