Ultramassive dead galaxy found

The find is rare not only because of its size but also because of its age. It existed when the universe was 1.8 billion years old.
An international team of astronomers has found an ancient dead galaxy of enormous size. The Phys.org website writes about it.

A team of astronomers observed a rare galaxy, identified as XMM-2599, using the MOSFIRE spectrograph at the Kek Observatory in Hawaii.

The find turned out to be of gigantic size – about 300 billion Suns. This makes the galaxy ultramassive. In addition, according to the data collected, it existed 12 billion years ago. At that time, the universe was 1.8 billion years old, and such supermassive galaxies were an incredible rarity
Previously, XMM-2599 demonstrated a high rate of star formation – a thousand solar masses per year. For unknown reasons, this process has completely stopped. Modern mathematical models suggest that the process of star formation in such galaxies should last longer.
Ultramassive dead galaxy found
Among the possible options, astronomers call the activation of a black hole in the center of the galaxy or the lack of matter for star formation.

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The day before, a mysterious recurring cosmic signal was discovered. The Correspondent also wrote that astronomers recorded an explosion of a space laser.