2021-01-13

ALMA has observed a distant colliding galaxy that is releasing gas from its stars

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ALMA has observed a distant colliding galaxy that is releasing gas from its stars

Scientists estimate that the gas emitted by the Milky Way galaxy each year is equivalent to the mass of nearly 10,000 suns. The injection of gas is rapidly removing the galaxy’s creation of new stars. The fuel needed. The ejection of gas is thought to be triggered when galaxies collide, and this event may cause astronomers to rethink how galaxies stop bringing in new stars. When galaxies run out of fuel and stop producing stars, they will gradually die out.

Principal researcher Annagrazia Puglisi said that this is the first time astronomers have observed a typical large-scale star-forming galaxy in the distant universe. This distant galaxy called ID2299 is about to become large-scale. The jet of cold gas perishes. It is far away from us. It takes 9 billion years for light to reach the earth.

From Earth, astronomers see galaxies as the universe was only 4.5 billion years ago. The speed at which the galaxy forms stars is also very fast, hundreds of times faster than the formation of stars in the Milky Way. Astronomers say this means that the remaining gas will be quickly consumed by the rate of star formation.

ID2299 will no longer form stars in tens of millions of years, according to the rate of gas ejection and star formation consumption rate. Scientists believe that the gas ejection is caused by the collision and merging of two galaxies, and that the ejected gas is associated with the “tidal tail”. The tidal tail is a stream-like appearance formed by the formation of stars and gas extending into the interstellar space. It is produced when two galaxies merge. Normally, the tidal tail is too weak to be seen in distant galaxies, however, it can be seen in ID2299.

Astronomers believe that the wind caused by star-forming wind and the activity of black holes in the center of massive galaxies are responsible for the emission of star-forming matter into space. However, new research suggests that the merger of galaxies may also be the cause of the ejection of gas into space.