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The Bridge: Discuss an Astronomy Picture of the Day • APOD: Regulus and the Dwarf Galaxy (2024 Apr 26)

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Well I was going to ask at what point we differentiate between a star cluster and dwarf spheroidal galaxy, but thanks to the color commentary I am guessing the black hole at the center may be a factor. :idea:
Some globular clusters have central black holes.

I think there are at least two differences. A globular cluster has a different radial density gradient than a galaxy. And a globular cluster has a very different HR diagram than a galaxy, indicating a different formation process.




Galaxies and globular clusters contain different types of stars.

Ann
Exactly. Which reasonably suggests that they have entirely different formation processes.

Statistics: Posted by Chris Peterson — Fri Apr 26, 2024 2:13 pm — Replies 9 — Views 206



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