https://www.legacysurvey.org//viewer/?ra=191.9676&dec=19.2754&layer=ls-dr10&zoom=16
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it’s not a ring galaxy
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A ring galaxy example: Interesting ringed galaxy
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The main difference with ringed galaxies is the core shape. As they are (likely) formed when a smaller galaxy passes through the centre of a larger one, you end up with a core that looks almost “detached” from the rest of the galaxy. In the example Chris posted, you can see it almost looks like there is a void around the core (this is certainly not the case, however). Equally, they can also end up looking like the core is a galaxy of its own (almost like another elliptical or spiral in the centre of the galaxy). 2 examples of this second variety is shown below.
Whilst this is not any official way/scientifically rigorous way of classifying whether a galaxy is a ring galaxy or not, it is a fairly good rule of thumb that has worked in the examples I have seen.
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My example is a Hoag-type galaxy. Other examples are connected by a bar.
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Yes, but both are ring galaxies.
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