Hubble Finds Spiraling Stars (NGC 346)

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bystander
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Hubble Finds Spiraling Stars (NGC 346)

Post by bystander » Thu Sep 08, 2022 3:12 pm

Spiraling Stars Provide a Window into the Early Universe
ESA Hubble Science Release | 2022 Sep 08
heic2211b[1].jpg
heic2211a[1].jpg
Click to view full size image 1 or image 2
Credit: NASA, ESA, Andi James (STScI)
Astronomers have been bemused to find young stars spiralling into the centre of a massive cluster of stars in the Small Magellanic Cloud, a satellite galaxy of the Milky Way. The outer arm of the spiral in this huge, oddly shaped stellar nursery — called NGC 346 — may be feeding star formation in a river-like motion of gas and stars. This is an efficient way to fuel star birth, researchers say.

The Small Magellanic Cloud has a simpler chemical composition than the Milky Way, making it similar to the galaxies found in the younger Universe, when heavier elements were more scarce. Because of this, the stars in the Small Magellanic Cloud burn hotter and so run out of their fuel faster than in our Milky Way. Though a proxy for the early universe, at 200 000 light-years away the Small Magellanic Cloud is also one of our closest galactic neighbours.

Learning how stars form in the Small Magellanic Cloud offers a new twist on how a firestorm of star birth may have occurred early in the history of the Universe, when it was undergoing a 'baby boom' about two to three billion years after the Big Bang (the Universe is now 13.8 billion years old).

The new results show that the process of star formation there is similar to that in our own Milky Way. ...

NASA's Hubble Finds Spiraling Stars,
Providing Window into Early Universe

NASA | GSFC | STScI | HubbleSite | 2022 Sep 08

The Internal Proper Motion Kinematics of NGC 346:
Past Formation and Future Evolution
~ E. Sabbi et al The Internal Line-of-Sight Kinematics of NGC 346:
The Rotation of the Core Region
~ Peter Zeidler et al
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Ann
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Re: Hubble Finds Spiraling Stars (NGC 346)

Post by Ann » Sat Sep 10, 2022 5:41 am

I couldn't quite picture the spiraling stars, because this part had me stumped:
The outer arm of the spiral in this huge, oddly shaped stellar nursery — called NGC 346 — may be feeding star formation in a river-like motion of gas and stars.
The outer arm of what spiral? The spiral of the Small Magellanic Cloud itself? But the SMC isn't a spiral!


And what is the outer arm of a spiral? This?

Spiral and arrow.png
Is this the outer arm of a spiral?


But, okay! I sort of missed the fact that bystander had provided an "image 2", which actually showed the spiraling motion of the stars. :oops: So, even though I was lazy, this is apparently how the spiraling stars spiral in NGC 346! :D

heic2211b[1].jpg

Ann
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