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EA: Spiral galaxies with ring structures – Alonso S.

April 21 @ 10:15 am 10:30 am CMT

In this talk we will present a statistical analysis of different characteristics of ringed spiral galaxies with the aim of assessing the effects of rings on disk galaxy properties. We built a catalog of ringed galaxies from the Sloan Digital Sky Survey Data Release 14 (SDSS-DR14). We classified the face-on spirals into galaxies with: an inner ring, an outer ring, a nuclear ring, both an inner and an outer rings, and a pseudo-ring. We found 1868 ringed galaxies, accounting for 22% of the full sample of spiral galaxies. Moreover, 64% of the ringed galaxies present bars. We also found that ringed galaxies have both a lower efficiency of star formation activity and older stellar populations with respect to non-ringed disk objects. Moreover, there is a significant excess of ringed galaxies with red colors. These effects are more important for ringed galaxies that have inner rings and bars with respect to their counterparts that have some other types of rings and are non-barred. These findings seem to indicate that rings are peculiar structures that produce an accelerating galactic evolution, strongly altering the physical properties of their host galaxies.

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