Home https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Science https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ The radio telescope reveals thousands of star-forming galaxies in the early universe

The radio telescope reveals thousands of star-forming galaxies in the early universe



Researchers can understand supernova explosions from stars, collisions of galaxy clusters and active black holes

Researchers can understand supernova explosions from stars, collisions of galaxy clusters and active black holes

The images capture drama billions of years ago in the early universe ̵

1; glittering galaxies glowing with stars that exploded in supernovae and blazing jets fired from black holes.


European giant radio telescope LOFAR has discovered stars born in tens of thousands of distant galaxies with unprecedented accuracy in a series of studies published Wednesday.

Using techniques that correspond to a very long exposure and with a field of view approximately 300 times the size of the full moon, scientists have been able to distinguish galaxies like the Milky Way deep in the ancient universe.

“The light from these galaxies travels billions of years to reach Earth; that means we see galaxies as they were billions of years ago when they formed most of their stars,” said Philip Best of the British University of Edinburgh, who leads the in-depth study. examination of the telescope in a press release.

The LOFAR telescope combines signals from a vast network of over 70,000 individual antennas in countries from Ireland to Poland connected to a high-speed optical network.

They are able to observe very weak and low-energy light, invisible to the human eye, which is created by ultra-energy particles traveling close to the speed of light.

The researchers say this allows them to study supernova explosions, galaxy cluster collisions and active black holes that accelerate these particles on impact or jet.

Distant star-forming galaxies appear as dots and faint orange objects, but active black holes are also seen as here in

Distant galaxies forming stars appear as dots and faint orange objects, but active black holes are also seen as here on the top left

By observing the same areas of the sky over and over again and collecting data to make a very long exposure image, the scientists were able to detect the radio emission of stars exploding.

The most distant discovered objects are from the time when the universe was only a billion years old. It is now about 13.8 billion years old.

“When a galaxy forms stars, many stars explode at once, which accelerates many high-energy particles and the galaxies begin to emit,” said Cyril Tasse, an astronomer at the Paris Observatory and one of the authors of the study, published in a series of articles in the journal. Astronomy and astrophysics.

About 3 billion years after the Big Bang, he said, “it’s really fireworks” in young galaxies, with “peak star formation and black hole activity.”

The telescope focuses on a wide area of ​​the Northern Hemisphere sky, with an equivalent exposure time 10 times longer than that used to create its first space map in 2019.

“This gives much finer results, like a photo taken in the dark, where the longer your exposure is, the more things you can tell,” Tasse told AFP.

Deep images are obtained by combining signals from the telescope’s thousands of antennas, including more than four petabytes of raw data – the equivalent of about one million DVDs.


Help find the location of the newly discovered black holes in the LOFAR Radio Galaxy Zoo project


© 2021 AFP

Quote: The radio telescope reveals thousands of star-forming galaxies in the early universe (2021, April 7), extracted on April 8, 2021 from https://phys.org/news/2021-04-radio-telescope-reveals-thousands-star- forming. html

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