Astronomers have observed many ‘dead’ galaxies but the method of the death itself hasn’t been observed before — so far .

Using the telescope Atacama Large Millimeter/submillimeter Array (ALMA), astronomers observed a galaxy, nine billion light years faraway from the world , ejecting nearly half its star-forming gas and losing fuel.

Galaxies begin to ‘die’ when star formation stops inside them or they begin losing material that forms stars.

The ID2299 galaxy is currently ejecting material worth about 10,000 suns per annum within the sort of cold gas ejection. it’s estimated that the galaxy is currently removing 46 per cent of the entire cold gas it contains.

The galaxy remains forming new stars very rapidly, but since it’s also quickly running out of fuel, the remaining gas are going to be consumed and therefore the galaxy is probably going to be dead within a couple of million years.

“This is that the first time we’ve observed a typical massive star-forming galaxy within the distant Universe close to ‘die’ due to a huge cold gas ejection,” said Annagrazia Puglisi, lead researcher of the new study from UK’s Durham University and therefore the Saclay Nuclear Research Centre (CEA-Saclay), France, during a statement.

The findings were published within the journal Nature Astronomy Monday.

Why ID2299 is ejecting gas

The research team behind the findings believes that the ID2299 galaxy is ejecting monumental amounts of cold gas due to a collision between two galaxies, which eventually merged to make ID2299.

Colliding galaxies are identifiable by their ‘tidal tail’ — elongated streams of gas and stars traced call at region behind the galaxies.

These tails are harder to identify in distant galaxies but since the researchers caught the brilliant feature even as it had been launching into space, they were ready to identify that the gas ejection was a neighborhood of the trail.

It was previously believed that region activity also as winds caused by star formation ejected the gases out of galaxies.

“Our study suggests that gas ejections are often produced by mergers which winds and tidal tails can appear very similar,” said study co-author Emanuele Daddi of CEA-Saclay within the statement.

Daddi believes that retrospective analysis of gas ejections captured could confirm if a number of them are actually tidal tails.

“This might lead us to revise our understanding of how galaxies ‘die’,” he added.

The discovery was a serendipitous accident and occurred when the team was inspecting data from a galaxy survey conducted by ALMA to review the properties of cold gas in distant galaxies.

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