Discovered two new ancient galaxies

Artist's impression of ancient galaxies.

Artist’s impression of ancient galaxies.
picture: University of Copenhagen/NASA

The existence of two previously undiscovered galaxies approximately 29 billion light-years away shows that our understanding of the early universe is very lacking.

Introducing REBELS-12-2 and REBELS-29-2-two galaxies, until recently, we didn’t even know their existence. It took 13 billion years for the light of these galaxies to arrive here because these objects were formed shortly after the Big Bang. The continuous expansion of the universe puts these ancient galaxies about 29 billion light-years away from Earth.

new Research Research published in the journal Nature shows that REBELS-12-2 and REBELS-29-2 have not been discovered so far because our view of these galaxies is shrouded in thick layers Cosmic dust. Although the Hubble Space Telescope is powerful, it cannot peek through the haze of celestial bodies.It takes super sensitive Alma Radio Telescope The discovery of a galaxy in Chile turned out to be an accidental accident.

“We are observing a sample of a very distant galaxy, and we have known from the Hubble Space Telescope that they exist. Then we noticed that two of them had a neighbor that we didn’t expect to be there at all,” from Copenhagen Niels Bohr Research Astronomer Pascal Oesch of the Universe Dawn Center explained in a statement. statement“Because these two adjacent galaxies are surrounded by dust, some of their light is blocked, making Hubble unable to see them.”

Ursch is an expert in finding the farthest galaxy in the universe.As early as 2016, he and his colleagues detected the GN-z11 galaxy 13.4 billion years ago and set a Cosmic distance record. GN-z11 was formed only 400 million years after the Big Bang.

The ALMA radio telescope made this discovery possible.

The ALMA radio telescope made this discovery possible.
picture: University of Copenhagen/NASA

This new paper describes how ALMA and new observation techniques developed by Oesch and his colleagues can discover similarly fuzzy ancient galaxies.Obviously there is more Waiting for discovery. Astronomers compared these two newly discovered galaxies with previously known sources of galaxies in the early universe, which made them suspect that “in our sky map, as many as one-fifth of the earliest galaxies may have disappeared.” Now,” Ursch said.

He added: “Before we begin to understand when and how galaxies in the universe are formed, we first need to make proper calculations.” In fact, this new paper asserts that there are more ancient galaxies in the early universe than previously thought. . This is important because the earliest galaxies form the cornerstones of subsequent galaxies. Therefore, before we have a “correct explanation,” as Oesch said, astronomers may be using a defective or otherwise inaccurate model of the early universe.

The task now is to find these missing galaxies. Fortunately, the upcoming instrument is expected to make this job easier: the Webb Space Telescope. Ersch said that this next-generation observatory “will be more sensitive than Hubble and able to study longer wavelengths, which should allow us to easily see these hidden galaxies.”

Therefore, this new paper is testable because Webb’s observations may confirm, deny, or further refine the researchers’ predictions.Space Telescope Project emission From French Guiana, Wednesday, December 22nd at 7:20 AM Eastern Time (4:30 AM Pacific Time).

more: NASA said the Webb telescope was not damaged after the installation incident.

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