Scientists have discovered the farthest galaxy

Scientists have discovered the farthest galaxy

HD1, red, seen in the center of a zoom-in image. Available: Harikane et al.

A global group of astronomers, including researchers at the Center for Astrophysics | Harvard and the Smithsonian have identified the greatest astronomer: a galaxy.

Named HD1, the potential galaxy is about 13.5 billion light -years old and was unveiled Friday at Astrophysical Newspaper. In a paper published in Letters of the Royal Astronomical Societyscientists have begun to wonder what the galaxy looks like.

The company believes in two ideas: whether HD1 will form an astounding number of stars or whether it will be home to Population III stars, the world’s earliest stars – so far, it’s not known. . On the other hand, HD1 can have a supermassive black hole about 100 million times the size of our Sun.

“It’s hard to answer questions about the nature of a cause so far,” said Fabio Pacucci, lead author of the MNRAS study, co-author on the paper on ApJ, and an astronomer at the Center for Astrophysics. “It’s like guiding the race of the ship from the flag it’s flying, even though it’s far inland, with the ship in the middle of the wind and the fog. One might see a some colors and styles of the flag, but not all of them. “The end is a long game of looking at and leaving out implausible features.”

HD1 is very sensitive to ultraviolet light. To explain this, “there are some dynamic processes going on there or, better yet, they were done a few billion years ago,” Pacucci said.

At first, researchers thought HD1 was a typical starburst galaxy, a galaxy that produces stars at high altitudes. But after counting the number of active HD1 stars, they got “an amazing number – HD1 is made up of more than 100 stars each year.

That’s when the team began to doubt whether HD1 would form normal stars.

“The first population of stars created in the universe was much larger, brighter and hotter than modern stars,” Pacucci said. “If we think that the stars produced in HD1 are the first stars, or Population III, stars, then we can easily explain its properties. The ultraviolet light of HD1.

Scientists have discovered the farthest galaxy

The Timeline shows the earliest galaxy candidates and the history of the entire universe. Available: Harikane et al., NASA, EST and P. Oesch / Yale.

A large black hole, however, could explain the HD1’s high brilliance. When it consumes a lot of gas, high energy photons can be released by the earth around the black hole.

If that was the case, it was the first supermassive black hole ever seen by man, seeing as closely as the Big Bang compared to the current record holder.

“HD1 represents a huge baby in the production room of the universe,” said Avi Loeb, an astronomer at the Center for Astrophysics and lead author at the MNRAS teaching. “It broke the highest redshift quasar by recording at close to two points, which was an amazing feat.”

The HD1 was discovered after 1,200 hours of observation with the Subaru Telescope, VISTA Telescope, UK Infrared Telescope and Spitzer Space Telescope.

“Getting HD1 from more than 700,000 objects is a daunting task,” said Yuichi Harikane, an astronomer at the University of Tokyo who saw the mirror. “The red color of HD1 is similar to the specimens of a galaxy 13.5 billion light -years away, giving me a kind of shock when I get it.”

The team then conducted the observation using the Atacama Large Millimeter / submillimeter Array (ALMA) to verify the distance, which is 100 million years lighter than GN-z11, the recorder. now for the most recent galaxy.

Using the James Webb Space Telescope, the research team will look again at HD1 to determine its distance from Earth. If the current calculations are correct, the HD1 is the oldest – and oldest – galaxy recorded.

The same experts will allow the team to dig deeper into HD1’s knowledge and verify if any of their assumptions are correct.

“Establishing a few hundred million years after the Big Bang, a black hole in HD1 has grown out of a large seed in unknown numbers,” Loeb said. “Again, the character is more thoughtful than we are.”

Astronomers oppose the largest dark pit at the heart of the Milky Way, Sagittarius A *

More information:
A Search for H-Dropout Lyman Break Galaxies at z ~ 12-16, arXiv: 2112.09141 [astro-ph.GA], Accepted for printing on MNRAS Leta.

What are the causes of the release of z∼13 which are now known as stars or quasars ?, arXiv: 2201.00823 [astro-ph.GA], Approved for printing on ApJ.

Presented by the Harvard-Smithsonian Center for Astrophysics

Directions: Scientists see the farthest mirror (2022, April 7) taken on April 7, 2022 from

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