Chinese astronomers have discovered a new galaxy with an unusual mass distribution. Preprint article about it published at archive.org.
The galaxy was named FAST J0139+4328 in honor of China’s 500 m FAST radio telescope. This is the world’s largest radio telescope with a full aperture, allowing you to study compact objects filled with gas galaxies and interstellar medium.
Now, scientists from the Chinese Academy of Sciences have announced the discovery with the help of a new galaxy 94 million light-years from the Sun. A study of FAST J0139+4328 showed it to be a typical disk galaxy with extremely low absolute magnitude and a mass of less than 690,000 solar masses. The dynamic and baryonic masses of FAST J0139+4328 were calculated to be approximately 5.1 and 0.11 billion solar masses, respectively. This means that this galaxy has about 47 times more dark matter by mass than ordinary matter.
The concept of dark matter originated in the 20th century when analyzing the rotation of the arms of spiral galaxies, where serious anomalies were discovered. The stars in them do not rotate around the center as they should, as if affected by a large hidden mass. In this context, astronomers introduced the concept of dark matter, a variable that, when added to the equations of motion, makes the model look like real life. It is believed that this dark matter does not interact with electromagnetic radiation, including light, and therefore cannot be seen, but can be calculated from the influence of gravity.
Ancient Russian astronomers reported It’s about a large asteroid that will approach Earth on February 16.