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Astronomers have just discovered new galaxies on the edge of the observable universe


Astronomers just got lucky.

A pair of ancient galaxies living at the very edge of space and time have just been discovered by a team of astronomers and scientists hidden behind a thick veil of cosmic dust, according to a recent study published in the journal Nature.

Eclipsed galaxies formed more than 13 billion years ago, approximately 800 million years after the Big Bang, which gave life to the universe as we know it. And there may be even more ancient objects waiting for us to choose from the accumulation of the cluttered beginning of the universe.

Ancient galaxies from the dawn of the universe

It was lucky that the team of scientists saw the ghostly spectral signals from the two galaxies. This incredible feat was accomplished by a team of frontier scientists led by Yoshinobu Fudamoto of the National Astronomical Observatory of Japan (NAOJ), who is also an astronomer at the Research Institute of Science and Engineering at Waseda University, Japan. The team looked at neighboring (younger) galaxies that glowed much brighter in ultraviolet (UV) light when they noticed something extra. And “the accidental discovery of these two dusty galaxies” at the very end of the known universe “shows that our current (UV-based) enumeration of very early galaxies is still incomplete,” according to a recent study.

And it was November 2019 when Fudamoto and his colleagues witnessed galaxies lurking in an extremely distant era of the universe, using the large millimeter / submillimeter array of Atacama (ALMA), which is a highly sensitive interferometer in Chile. ALMA can observe objects at colossal distances, peek through dusty environments to see existing objects the ancient age of space called the “cosmic dawn” or “era of reionization” when the first galaxies and stars appeared.

Distant galaxies from the edge of time and space. Source: ALMA (ESO / NAOJ / NRAO), NASA / ESA Hubble Space Telescope, ESO, Fudamoto et al.

This can change the way we model the early universe

As part of a larger ALMA program called the Reionization-Era Bright Emission Line Survey (REBELS), Fudamoto and his team studied 40 luminous galaxies that existed in this nascent age of the universe. The team observed two target galaxies, called REBELS-12 and REBELS-29, when they spotted blurred patterns of additional emissions emitted from a place several thousand light-years away from known brighter galaxies. Further observations confirmed that this team of astronomers and scientists was actually staring at the faces of two hitherto unknown galaxies hiding behind thick clouds of cosmic dust. They were later called REBELS-12-2 and REBELS-29-2 and are invisible to both optical and UV light. ALMA could only find them because of him hypersensitivity to long infrared wavelengths.

So far, the discovery suggests that up to one in five galaxies living at the time of cosmic dawn may be hiding behind dark clouds of cosmic dust, which could change the way we model the formation of stars and galaxies in this ancient era. The universe. Fudamoto and his team believe that “a blind, large-scale study of such sources is needed in the future,” according to the study. These studies need to be observed much more deeply than previously thought in order to take samples from weaker, dust-clouded but otherwise “normal” galaxies such as REBELS-12-2 and REBELS- 29-2. ” It is incredibly satisfying to know that at the dawn of the universe, entire galaxies full of stars have already flourished, only 800 million years ago. after the Big Bang.





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