1.5 billion years after the Big Bang: the oldest spiral galaxy has been found

11 months ago

The open galaxy DLA0817g was called “Wolf’s Disc” by scientists.

Scientists have discovered the oldest spiral galaxy “Wolf’s Disc”, formed 1.5 billion years after the Big Bang. This is reported by the National Radio Astronomy Observatory.

According to the astronomers, earlier it was believed that the universe could not have been such galaxies. The scientists named the open galaxy DLA0817g “Wolf’s Disc” after American astrophysicist Arthur Wolf, who was one of those who discovered it a few years ago.

The galaxy is believed to have formed 1.5 billion years after the Big Bang, 1 billion years earlier than galaxy A1689B11. The latter, until recently, was considered the oldest spiral galaxy.

The discovery made may affect the understanding of galaxies. It is believed that large galaxies in the early period of the Universe were formed by the fusion of smaller galaxies and hot gas accumulations. But the Wolf Drive was formed by the constant accumulation of cold gas.

Most models also assume that the galaxy’s disk is formed about 6 billion years after the Big Bang, which is 4.7 billion years later than the Wolf’s disk was formed.

Images of the galaxy show that its disk rotates at about the same speed as the Milky Way. But DLA0817g is smaller than our galaxy: its mass is estimated at 72 billion masses of the Sun, while the mass of the Milky Way is over a trillion solar masses. But the speed of star formation in it is higher.

Leave a Comment