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The largest in the world! Chinese Sky Eye found 41741 samples of neutral hydrogen galaxies in only 3 years.

2024-04-25 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > IT Information >


Shulou( Report--

Thanks to netizens for the delivery of clues about the past., December 12, China Sky Eye Neutral hydrogen Survey (FASHI) completed a survey of about 7600 square degrees in only three years (August 2020-July 2023) and discovered 41741 samples of neutral hydrogen galaxies.

The above picture shows the distribution of 41741 neutral hydrogen sources on the celestial sphere obtained by the FASHI survey, represented by blue dots. Samples of ALFALFA and HIPASS galaxies are represented by red dots and green dots respectively. Samples of ALFALFA and HIPASS galaxies are represented by red dots and green dots respectively. The number of samples of ALFALFA is more than 10,000 less than that of FASHI; HIPASS has a large-scale sky coverage, but only more than 5000 samples have been detected. Two black dotted lines mark the position of the galactic plane (silver latitude b = ±10 °). The Guizhou Radio Observatory of Guizhou University, the National Astronomical Observatory of the Chinese Academy of Sciences and Peking University recently used Chinese celestial eye survey data to construct and release the world's largest sample of neutral hydrogen galaxies, sharing high-quality large sample observations with galaxy and cosmological researchers around the world.

The relevant results were published in the English edition of the Chinese academic journal Chinese Science: physics, Mechanics and Astronomy, and published in the form of a cover article. Note: hydrogen is the first element in the periodic table, the most abundant element in the universe and an important part of galaxies, while neutral hydrogen (atomic hydrogen in the ground state) exists widely in different stages of galaxy evolution.

The Chinese Sky Eye is a sharp weapon to detect weak neutral hydrogen galaxies. Compared with the previous neutral hydrogen survey, the Chinese Sky Eye Neutral hydrogen Survey has higher spectral and spatial resolution, broader coverage, more reliable and more complete data quality.

The samples observed by China Sky Eye exceed other neutral hydrogen survey projects at home and abroad in terms of quantity and data quality, and it is estimated that more than 100,000 neutral hydrogen galaxies will be detected in the next five years.

The team shared to researchers in the field of galactic cosmology the world's largest sample of neutral hydrogen galaxies, neutral hydrogen gas distribution in neighboring galaxies and large-scale structural observations. The survey data are of great significance for studying the neutral hydrogen mass function at the low-mass end of galaxies, limiting the properties of dark matter, discovering unknown dark and weak galaxies, and studying the large-scale structure and evolution of the universe.

Two reviewers in the journal "Chinese Science: physical Mechanics and Astronomy" spoke highly of this work: FASHI large sample data is an excellent achievement, and the FASHI Sky Survey project has made an extremely important contribution to astronomical research, especially in the field of galactic evolution.

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