January 29, 2022

Beyond Going Long

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Take a look at the largest and most detailed 3D map of the universe

Dark Energy Spectrophotometer (DESI), currently at Kitt Peak National Observatory in Arizona, Nicholas U. The spacecraft’s mission is to map the vastness of space and point to the sky from the home of the Mayle Telescope. dark energyand create the most detailed 3D map of the universe ever built.

The DESI mission only took seven months, and we already have a standard 3D image of the surrounding galaxy cracking its jaw, demonstrating DESI’s ability to map the universe.

DESI has already cataloged and mapped more than 7.5 million galaxies, with over 1 million new galaxies being added every month. By the time the surveys are completed in 2026, more than 35 million galaxies are expected to be mapped, providing astronomers with an extensive library of data.

“There is so much beauty in it,” Astrophysicist Julian Gay says From Lawrence Berkeley National Laboratory in California.

“There are huge clusters, filaments and cavities in the distribution of galaxies on the 3D map. They are the largest structures in the universe. But in them you will get an impression of a very early universe and its history since then.”

DESI consists of 5,000 optical fibers, each of which is individually controlled and distributed by its own small robot. These fibers must be positioned as precisely 10 microns or less the thickness of a human hair, and then capture flashes of light as they filter from space to Earth.

Through this network of fibers, the device takes pictures of millions of galaxies covering more than a third of the entire sky, and then calculates how much light appeared. red scroll – That is, the amount of its shift towards the red end of the spectrum due to the expansion of the universe.

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Since this light can take billions of years to reach Earth, it is possible to use redshift data to search deeper into space: the greater the redshift, the farther away. Furthermore, structures mapped by DESI can be reverse-engineered to visualize the initial configuration they initiated.

(Data D. Schlegel / Berkeley Lab / DESI)

higher: Cut through a 3D map of galaxies from the first satellites, the Sloan Digital Sky Survey (left) and the Dark Energy Spectroscopic Instrument (right).

DESI’s main goal is to discover more about dark energy, which is believed to make up 70% of the universe, as well as to speed up its expansion. This dark energy can push galaxies to infinite expansion, causing them to collapse on their own or something in between — and cosmologists are trying to narrow down the possibilities.

And[DESI] “This will help us find traces of the nature of dark energy,” said Carlos Frank, a cosmologist at the University of Durham in the United Kingdom. BBC saidAnd

We will find out more dark matter And it plays a role in how galaxies like the Milky Way form and how the universe evolves.”

The already published 3D map shows that scientists do not have to wait for DESI to complete its work in order to benefit from its deepening in space. Further research has been refined by DESI to see if smaller galaxies have galaxies of their own black holes Just like the big galaxies.

The best way to detect a black hole is to see if it contains gas, dust and other matter, but in smaller galaxies it’s not so easy to see – something helped by the high-resolution spectra collected by DESI.

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Then there is the study KaiserIn particular, the glowing galaxies backed by supermassive black holes that have served as landmarks for billions of years of space history. DESI is used to test the hypothesis surrounding quasars that they are surrounded by an envelope of dust that disappears over time.

The amount of dust around the quasar is thought to affect the color of the light emitted by it, making it an ideal task for DESI. By the time the survey is complete, the instrument should be able to gather information about 2.4 million quasars.

“DESI is really cool because it picks up a lot of the muted and reddish elements,” astronomer Victoria Fawcett says: from Durham University.

“We found many exotic systems, including large samples of rare elements that we could not study in detail before.”

You can keep up with the latest news from the dark energy spectrophotometer Official home pageAnd