When the stars in a galaxy stop forming, the galaxy will die. For the first time ever, astronomers have observed this phenomenon in a distant galaxy.
According to a report by CNN, scientists using the “Atacama” large millimeter/submillimeter telescope array in Chile were able to capture “rare observations of the Milky Way” because it ejected and formed stars. Almost half of the gas used.”
According to CNN, it has taken nearly 9 billion years for the light from this galaxy named ID2299 to reach Earth-which means that astronomers “observed the universe for only 4.5 billion years (it is now estimated to be 1
The report explains that the ID2299 galaxy is losing the fuel needed to form stars-gas worth 10,000 suns per year-so far it has cleared 46% of the galaxy’s total cold gas.
However, the report pointed out that ID2299 is still rapidly forming stars “hundreds of times faster than our own Milky Way.”
The report explains that the formation of these stars will exhaust the remaining gas in the Milky Way and effectively “cause the death of ID2299 within tens of millions of years.”
CNN cited the research, which was published in the journal Nature Astronomy on Monday.
CNN quoted the postdoctoral researcher Annagrazia Puglisi, the lead researcher of the University of Durham in the United Kingdom and the Thackeray Nuclear Research Center in France: The distant universe was “dead” due to a massive jet of cold gas. “
What caused the demise of the galaxy?
According to this report, the cause of this galaxy’s death may be a collision with another galaxy, “the latter eventually merged into ID2299.”
Is there convincing evidence that the gas loss may be the result of a collision? According to the CNN report, the study says that there is one-known as the tidal tail-“a long string of gas and stars extending into space after two galaxies collide.”
Although these tidal tails are usually “too faint” in galaxies at this distance, studies have shown that in this case, astronomers can see their bright tails when they extend into space.
Astronomers may need to reconsider previous theories.
Previously, scientists believed that the “end of star formation” occurred when “the wind generated by star formation, coupled with the active black hole in the center of a huge galaxy, sent the material needed to form a star into space.” CNN is cited.
However, the study pointed out that if the gas loss in this galaxy is caused by mergers, “astronomers may need to reconsider the theory of the end of star formation in the galaxy.”
CNN quoted research co-author and astronomer Emanuele Daddy from the French Sacré Nuclear Research Center, saying: “Our research shows that the merger can produce gas jets, and the wind and tidal tails look very similar. “He added: “This may change our understanding of the “death” of galaxies.”
This discovery was an accidental discovery.
An interesting aspect of this discovery is that “it was made while astronomers were conducting another survey of the air-conditioning in a distant galaxy”, although their observation of ID2299 lasted only a few minutes, “it was enough to capture At the end of the tide,” CNN reported. Moreover, it is still possible to reveal more information about the gas jets in the Milky Way through future observations.
CNN quoted research co-author and researcher Chiara Circosta of University College London as saying: “ALMA provides new ideas for the mechanism of preventing star formation in distant galaxies. Witnessing such a large-scale destruction event adds important importance to the complex problems of galaxy evolution One ring.”