Ring Galaxies?

[pickinduck]

Right now I'm watching Mike Rowe talk about Alien Galaxies on How the Universe Works on TV. He was saying about black holes at center of galaxies drawing in and feeding on stuff there. I have heard before that everything is expanding. To me it seems like there should be ring galaxies but I don't recall ever seeing or hearing about them. So are there ring galaxies?

[pickinduck]

I just heard someone on the show say ring galaxies so I guess they do exist.

[sherlew99]

Ah, just found a great article by Bob King.

One Small Order of Ring Galaxies, Please

By: Bob King | March 18, 2015

"One Ring to rule them all." Join me as we explore a unique class of galaxies forged in the chaos of collision.



As Orion tilts to the west, the approach of spring offers a wonderful diversity of galaxies for telescopic viewing. Spirals. Ellipticals. Irregulars. Here and there among them are representatives of a rare breed — the ring galaxies. Shaped like onion rings, their formation is rooted in catastrophe.

Click here for the rest of the article.

[sherlew99]

And here's another interesting article.

Giant Mystery Ring of Galaxies Should Not Exist

[pickinduck]

Apr 9, 2016 11:02:08 GMT -6 sherlew99 said:

Ah, just found a great article by Bob King.

One Small Order of Ring Galaxies, Please

By: Bob King | March 18, 2015

"One Ring to rule them all." Join me as we explore a unique class of galaxies forged in the chaos of collision.



As Orion tilts to the west, the approach of spring offers a wonderful diversity of galaxies for telescopic viewing. Spirals. Ellipticals. Irregulars. Here and there among them are representatives of a rare breed — the ring galaxies. Shaped like onion rings, their formation is rooted in catastrophe.

Click here for the rest of the article.

That Serpens galaxy is exactly what I thought one would look like.
They said on TV that the Sombrero galaxy is a ring galaxy but we view it edge on so how do they know?

[sherlew99]

Ah ha, I thought that they'd be using something other than the visable spectrum on this. I've never hear of a galaxy that is a combination of two forms before, though.


The infrared vision of NASA's Spitzer Space Telescope has revealed that the Sombrero galaxy -- named after its appearance in visible light to a wide-brimmed hat -- is in fact two galaxies in one.