When the stars in the galaxy cease to form, the galaxy dies. For the first time, astronomers have observed this phenomenon in a distant galaxy.
According to CNN, scientists using the Atacama Large Millimeter / submillimeter Array telescope in Chile were able to capture images. It is a “rare observation” of the galaxy. “As it expels almost half of the gas used to make stars”
CNN reports that it takes almost nine billion years for the light from this galaxy, called ID2299, to reach Earth, which means that astronomers are basically “observing how it appeared when the universe was only 4.5 billion. Years (now estimated to be 14 billion years old) “
The ID2299 galaxy is losing the fuel it takes to make its stars – the value of 10,000 Suns a year, and so far have eliminated 46% of the galaxy’s total cold gas.
However, at a rate that is hundreds of times faster than our own Milky Way, ID2299 continues to rapidly generate stars, the report said.
These star formation will deplete the remaining gas in the galaxy and will “cause ID2299 to die in a few tens of millions of years”.
The study, cited by CNN, was published Monday in the journal Nature Astronomy.
CNN cited Annagrazia Puglisi, lead researcher and co-author of the study from Durham University in the UK and the Saclay Nuclear Research Center in France, who said in a statement: The body is a large star in general. The distant universe is dying by expelling a huge cold gas. ”
What could cause the galaxy to die?
According to reports, this galaxy’s cause of death could be a collision with other galaxies “which eventually came together to create ID2299”.
Is there any convincing evidence that gas loss could be a result of a crash? According to CNN, the study said there was – and it’s called a tidal tail – “a stream of gas and stars stretching out into space after two galaxies collided.”
These tidal tails are generally “too faint” to be seen in galaxies at this stage. But the study notes that in this case, astronomers were able to see a bright tail as it was expanding into space, CNN reported.
Astronomers may have to reconsider previous theories.
Previously, scientists believed that The “end of star formation” occurs when “The winds created by star formation, combined with black holes in the center of giant galaxies, send the materials needed to create stars out of space,” CNN cites.
However, the study notes that if the galaxy’s gas loss is due to convergence, “astronomers may need to consider new theories about the end of star formation in galaxies.”
CNN cited Emanuele Daddi, co-author and astronomer at the Saclay Nuclear Research Center in France, who said: “Our study suggests that ejection of gas can be caused by mergers and winds and tails may have. The characteristics are very similar, ”he added,“ this may require us to rethink our understanding of how galaxies die. ”
This observation was an unexpected discovery.
An interesting aspect of the discovery is that “it occurred while astronomers were conducting cold gas observations in distant galaxies.” But “this is enough to capture the tails of the waves,” CNN reports, and it remains possible to reveal more about galactic expulsion through future observations.
CNN cited co-author and researcher Chiara Circosta at University College London, who said in a statement: “ALMA has shed new light on a mechanism that could stop star formation in distant galaxies. Seeing such a massive disruption adds a significant part to the complex puzzle of galactic evolution. ”