Xinhua News Agency, Washington, October 14 (Reporter Zhou Zhou) An international team led by American astronomers first used the X-ray gravitational lens effect produced by the 5.7 billion light-year alien cluster to observe the formation of a dwarf galaxies 9.4 billion light-years away. The star process provides a new means of observation for exploring the origin of galaxies.
The gravitational lens effect refers to the phenomenon that light bends when passing near a massive celestial body. It is like a “cosmic magnifying glass” that can help people study the earliest and farthest galaxies in the universe.
This is the first time that astronomers have used supermassive celestial bodies to observe X-ray radiation in distant universes. Previously, galaxies were only used to "magnify" celestial bodies in the optical band. Matthew Bellis, a researcher at the Massachusetts Institute of Technology, said that because the cluster itself radiates a lot of X-rays, it is difficult to observe the X-rays emitted by the celestial bodies behind the clusters. The difficulty is like seeing through the glare. Candle light.
Using the Chandra X-ray telescope and the Hubble Space Telescope and the Magellan Telescope in the optical section, the researchers observed the "Phoenix Galaxy Cluster" with a mass of 750 billion light-years and a solar mass of 1000 trillion times, accurately measuring the X of the cluster. The amount of radiation. Subsequently, they subtracted the X-ray radiation of the galaxy cluster itself from the total amount of radiation observed, leaving two X-rays that were bent by the gravitational lens, all from one of the 9.4 billion light-years of the Milky Way. Small dwarf galaxies.
Studies have shown that this dwarf galaxies are magnified 60 times, showing a blue plaque. There are two different clumps in the galaxy, one of which radiates more X-rays, indicating that it has just produced supermassive stars, while the darker The mass indicates that it contains more mature stars.
Belis said that the galaxy is similar to the galaxy that was formed in the earliest days of the universe. Astronomers have never observed this galaxy in the X-ray segment, and this new observation technique allows people to see distant galaxies and A more detailed analysis of the formation of the galaxy.
The research was recently published in the British journal Nature and Astronomy.