Chinese astronomers have discovered 591 high-velocity stars with LAMOST and Gaia.

A research team led by the National Astronomical Observatories of the Chinese Academy of Sciences (NAOC) discovered the Large Sky Area Multi-Ject Object Fiber Spectroscopic Telescope (LAMOST) and also from Gayana Waycat.

The study was published in online Astrophysical Journal Supplement December 17 series.

Since the discovery of the first high-velocity star in 2005, more than 550 people have been detected by multiple telescopes in 15 years. “The 1,591 high-velocity stars found at this time have doubled the total number previously discovered, exceeding the current total of 1,000,” said the study’s lead author. Lee Yinbi said.

High-velocity stars are a type of fast-moving star, and can even escape from a galaxy. “Although rare in the Milky Way, high-velocity stars with unique kinetics, in a wide range of galactic sciences, can provide deep insights from the central supermassive black hole to the distant galactic halo,” said Prof. L.U. Co-author of this paper.

Lamost, the largest optical telescope in China, has the highest spectral acquisition rate in the world and can observe about 4,000 celestial targets in a single exposure. It began regular surveys in 2012, and established the world’s largest spectra database.

Gaia is a space-based mission in the European Space Agency’s (ESA) science program launched in 2013. It provides astrometric parameters for more than 1.3 billion sources, the largest database of astrometric parameters. The co-author of this research, Prof. of NAOC. “Two large databases provide us with an unprecedented opportunity to find more high-velocity stars, and we did,” Luoli said.

From the Ministries of Kinetics and Chemistry, the research team found that 591 high-velocity stars were inner halo stars. “Their low metals indicate that a large portion of the stellar halo is formed as a result of the excitation and tidal disturbances of the dwarf galaxies,” said Zhao Gang, pro-author of MAOOC.

The discovery of these high-velocity stars tells us that a combination of multiple large surveys in the future will help us discover higher-velocity stars and other rare stars, which will be used to study the unsolved mystery about our galaxy.