Mon. Jan 24th, 2022


Only after seven In a matter of months, a huge team of scientists working with the Dark Energy Spectroscopic Instrument has already mapped out a larger portion of the universe than any other 3D survey. And since they are only 10 percent way through their five-year mission, much more needs to come.

DESI, pronounced as Desi Arnaz, has released a spectacular cosmic web of more than 7.5 million galaxies and will scan up to 40 million. The device is funded by the U.S. Department of Energy and is owned by Nicholas U. at the Kit Peak National Observatory near Tucson, Arizona. Mayal is installed in a 4-meter telescope. It measures the precise distances of galaxies from the Earth and the different wavelengths of light they emit, achieving quantity and quality at the same time. It will eventually cover about 8,000 square degrees, about 20 percent of the sky. The science gained from data parsing has not yet arrived, but it will especially help astrophysicists as they investigate how the universe is expanding.

“It simply came to our notice then. Despite the epidemic, we have been able to move forward. We had to shut down for a few months and then we adjusted, “said Julien Guy, a DESI project scientist at Lawrence Berkeley National Laboratory, the main organization for the collaboration. Now monitoring and data processing are mostly automated; Every morning, scientists get data on 100,000 galaxies collected overnight, he said.

“It’s amazing how well this device works and how well it is designed to detect the distances of these galaxies. It’s an incredibly efficient harvesting machine that would have been mind-boggling even two decades ago,” said Jason Rhodes, Pasadena Jet Propulsion. A laboratory research scientist working on a space telescope to map the galaxy.

A slice from the entire Sloan Digital Sky Survey (left) and a 3-D map of the galaxy from the first few months of the Dark Energy Spectroscopic Instrument (DESI; right). At the center of the Earth, the most distant galaxies are plotted 10 billion light-years away. Each point represents a galaxy. This initial version of the DESI map shows only 400,000 of the 35 million galaxies that will be on the final map. Using data from DESI courtesy of D. Schlegel / Berkeley Lab

The DESI consists of a number of instruments installed in the telescope’s 14-story dome. The circular focal plane is located near the top, and is made up of 10 wedge-shaped petals, each containing 500 tiny robots. These are what enable galactic cartography of instruments: these 5,000 pencil-sized robotic motor optical fibers must be accurately positioned within 10 microns – less than the thickness of human hair. This enables the device to collect accurate data on 5,000 galaxies at once. The telescope then points to another area of ​​the night sky and begins work on the next 5,000. In contrast, in one of DESI’s predecessors, Sloan Digital Sky Survey, Based on a telescope in southern New Mexico, scientists had to manually drill holes in a circular aluminum plate in the focus of the telescope for each set of measurements, and plugged small fibers for each single galaxy they wanted to observe.



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