Galaxy Mergers May Play Important Role in Quenching of Star Formation in Massive Galaxies | Astronomy

An artist’s impression of the ID2299 galaxy. Image credit: M. Kornmesser / ESO.

Astronomers utilizing the Atacama Massive Millimeter/submillimeter Array (ALMA) have found an enormous starburst galaxy with a tail of star-forming fuel within the distant Universe. Named ID2299, the galaxy is ejecting 46% of its star-forming fuel at a startling fee of 10,000 photo voltaic lots per 12 months. The researchers imagine that this spectacular occasion was triggered by a collision with one other galaxy.

An artist’s impression of the ID2299 galaxy. Picture credit score: M. Kornmesser / ESO.

ID2299 is situated roughly 9 billion light-years away from Earth; we see it when the Universe was simply 4.5 billion years previous.

The fuel ejection within the galaxy is going on at a fee equal to 10,000 photo voltaic lots per 12 months.

As a result of ID2299 can be forming stars very quickly, a whole lot of occasions sooner than our Milky Manner, the remaining fuel might be shortly consumed, shutting down the galaxy in only a few tens of million years.

The occasion accountable for the spectacular fuel loss is a collision between two galaxies, which finally merged to kind ID2299.

“That is the primary time now we have noticed a typical large star-forming galaxy within the distant Universe about to ‘die’ due to an enormous chilly fuel ejection,” stated lead creator Dr. Annagrazia Puglisi, an astronomer at Durham College and the Saclay Nuclear Analysis Centre.

Most astronomers imagine that winds attributable to star formation and the exercise of black holes on the facilities of large galaxies are accountable for launching star-forming materials into area, thus ending galaxies’ means to make new stars.

Nonetheless, the invention of ID2299 means that galactic mergers may also be accountable for ejecting star-forming gasoline into area.

“Our research means that fuel ejections may be produced by mergers and that winds and tidal tails can seem very comparable,” stated co-author Dr. Emanuele Daddi, an astronomer at CEA-Saclay.

“I used to be thrilled to find such an distinctive galaxy,” Dr. Puglisi stated.

“I used to be desirous to be taught extra about this bizarre object as a result of I used to be satisfied that there was some vital lesson to be realized about how distant galaxies evolve.”

ID2299 had been noticed by ALMA for just a few minutes, however the highly effective observatory allowed the group to gather sufficient knowledge to detect the galaxy and its ejection tail.

“ALMA has shed new mild on the mechanisms that may halt the formation of stars in distant galaxies,” stated co-author Dr. Chiara Circosta, an astronomer at College Faculty London.

“Witnessing such an enormous disruption occasion provides an vital piece to the advanced puzzle of galaxy evolution.”

The invention of ID2299 is described in a paper printed this week within the journal Nature Astronomy.


A. Puglisi et al. A titanic interstellar medium ejection from an enormous starburst galaxy at redshift 1.4. Nat Astron, printed on-line January 11, 2021; doi: 10.1038/s41550-020-01268-x


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