Science & Technology

NAOC helps to create the largest 3D map of the universe. – Science Inquirer

The Dark Energy Spectroscopic Instrument (DESI) team, including the Beijing-Arizona Sky Survey (BASS) research team at the National Astronomical Observatory of China (NAOC), has announced that the DESI project has created the largest and most detailed 3. .. -D map of the universe so far.

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Still, it’s only about 10% of the five-year mission. When completed, DESI will help us better understand the expansion of the universe and the formation and evolution of galaxies.

DESI is an international scientific cooperation project involving researchers from the United States, China, Spain, the United Kingdom, France and other countries. Upgrade the 4 m Mayor telescope at Kitt Peak, Arizona with a large observable perimeter. 5,000 galaxies per exposure. It aims to measure the redshift of tens of millions of galaxies, build a 3D matter distribution throughout the universe, and reveal the nature of dark energy.

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To create such a 3D map, NAOC’s BASS team, in collaboration with the DESI Imaging team, released a huge 2D map of the universe in January 2021. This paves the way for spectroscopic investigations.

DESI was originally proposed over 10 years ago. There was a long way to go to this point. DESI started construction in 2015. This device gave its first light in late 2019. In December 2020, DESI tested the hardware and software and turned to the sky again after a few months of shutdown. By May 2021, we are ready to start scientific research.

The survey already catalogs more than 7.5 million galaxies, breaking all previous records of galaxy surveys. The largest galaxy survey to date is the Sloan Digital Sky Survey (SDSS). In November 2021 alone, DESI cataloged 2.5 million galaxy redshifts. By the end of the 2026 run, DESI is expected to have over 35 million galaxies. During the verification and formal execution phase of the survey, the NAOC team will contribute to the observation and data analysis of the survey.

DESI has a lot of data and is now collaborating on its scientific analysis. The BASS team is funded by the National Foundation for Natural Sciences (NSFC) and provides scientific achievements in galaxy formation and evolution, including exploration of rare celestial bodies in extremely low-metal galaxies, dwarf galaxies, and Greenpeace galaxies. I want to produce it. These galaxies are very important for galaxy formation and cosmic reionization in the early universe.

Image Credit: DESI Collaboration Team

NAOC helps to create the largest 3D map of the universe. – Science Inquirer NAOC helps to create the largest 3D map of the universe. – Science Inquirer

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