A team of researchers from Japan’s National Observatory and others, through observations by the “Sein” and the Keck telescope, has discovered a “quiet” galaxy that is halting star-forming activity. The galaxy is heavier than the Milky Way, and its core was formed 12 billion years ago. It is also the most distant such galaxy ever found in the universe.
There are many galaxies in the universe, which fall into two categories: “vibrant” galaxies and “silent” galaxies. Galaxies are star-making factors that form gas, and many are actively making stars and glowing brightly. The other galaxy, for some reason, stopped star-forming, known as the “silent” galaxy. The reason why galaxies have become quiet is still unknown. Scientists believe that understanding galaxies that are weakening their star-making activity and are becoming quiet is the key to solving the mystery of the galaxy.
Using the Pleiades telescope for a long time to observe the cosmic region known as subbaru XMM Newton’s deep field, the team discovered the “silent” galaxy and then made detailed observations using the Keck telescope’s near-infrared spectrometer, which found that the galaxy was located 12 billion light-years away, 12 billion years ago in the universe. It was also confirmed that the star-forming movement of the galaxy was weak. It is the longest and oldest silent galaxy ever discovered. It is generally believed that galaxies that initially stopped forming stars and became silent in the history of the universe are very heavy galaxies, and the discovery of galaxies is also very heavy, which is important for understanding silent galaxies.
It was also found that the “core” of the galaxy was formed 12 billion years ago. Observations reveal that the stars in this galaxy are moving at about the same rate as the stars of the heavy galaxies in the universe today, i.e. the central part of the galaxy 12 billion years ago (nuclear) is already in the same state as the heavy galaxies in the universe today. It also means that the galactic nucleus was formed at an early stage.
The findings are published in the recently published Astrophysical Newsletter.