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Astronomers have detected a first-of-its form compact but large, fast-spinning, disk-shaped galaxy that stopped making stars just a few billion years after the Huge Bang.
Discovering such a galaxy early within the historical past of the universe challenges the present understanding of how large galaxies type and evolve, the researchers mentioned.
The discovering, printed within the the journal Nature, was potential with the potential of NASA’s Hubble house telescope.
When Hubble photographed the galaxy, astronomers anticipated to see a chaotic ball of stars fashioned by way of galaxies merging collectively.
As an alternative, they noticed proof that the celebs have been born in a pancake-shaped disk.
This was the primary direct observational proof that a minimum of among the earliest so-called “lifeless” galaxies – the place star formation stopped – by some means evolve from a Milky Manner-shaped disk into the large elliptical galaxies we see immediately.
NASA’s Hubble Space Telescope Captures the Universe’s Brightest Galaxies
“This new perception might drive us to rethink the entire cosmological context of how galaxies burn out early on and evolve into native elliptical-shaped galaxies,” mentioned research chief Sune Toft from College of Copenhagen, Denmark.
“Maybe we’ve been blind to the truth that early ‘lifeless’ galaxies may in reality be disks, just because we have not been capable of resolve them,” Toft mentioned.
The distant galaxy was thrice as large because the Milky Manner however solely half the scale.
Rotational velocity measurements made with the European Southern Observatory’s Very Massive Telescope (VLT) confirmed that the disk galaxy was spinning greater than twice as quick because the Milky Manner.
Utilizing archival information from the Cluster Lensing And Supernova survey with Hubble (CLASH), Toft and his crew have been capable of decide the stellar mass, star-formation charge, and the ages of the celebs.
Why this galaxy stopped forming stars was nonetheless unknown. It is likely to be the results of an lively galactic nucleus, the place vitality was gushing from a supermassive black gap.
This vitality inhibits star formation by heating the gasoline or expelling it from the galaxy. Or it is likely to be the results of the chilly gasoline streaming onto the galaxy being quickly compressed and heated up, stopping it from cooling down into star-forming clouds within the galaxy’s centre.
However how do these younger, large, compact disks evolve into the elliptical galaxies we see within the present-day universe?
“In all probability by way of mergers,” Toft mentioned.
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