NGC 6632 - Ring Galaxy in Hercules (astroeyes)

NGC 6632 - Ring Galaxy in Hercules

I have a special interest in 'Ring' galaxies. About one fifth of all spirals are ring galaxies and a further third have broken or partial ring patterns. These rings are formed as a direct consequence of the internal dynamics and evolution of spiral galaxies and are particularly associated with bars and other non-symmetrical pertubations within the galaxy disc. Also, rings are usually sites of current active star formation and in some galaxies star formation only takes place in the 'ring'. A small number of 'ring' galaxies are the result of galaxy collisions but the vast majority of 'rings' are formed by resonance between the motions of dust and gas in the disc and a rotating 'bar' within the galaxy.

Although 'ring' galaxies are, therefore, a natural phenonemon, there are some anomalies. For example, not all barred galaxies form 'rings' and there are also rings in some non-barred galaxies.

I have recently imaged a few 'Ring' galaxies and I'd like to show you what I've got. Unfortunately there doesn't seem to be very many near or bright examples, which is surprising if they are supposed to be quite common.

Probably the brightest is ngc 6632 in Hercules. This one has a mag. of 13.1 and measures 3' x 1.5'. It has a distinctive 'ring' and clearly shows evidence of an inner and an outer ring. It probably had a rotating bar which was responsible for the ring formation. There is star formation going on in the inner ring, as far as I can see. Distance 212 MLy.

Original
Final
B

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Status	Basic pending
Started	...
Astrometry.net job	8774930
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