Large-Scale Outer Rings of Early-type Disk Galaxies
Irina P. Kostiuk (Special Astrophysical Observatory of the Russian, Academy of Sciences, Nizhnij Arkhyz, Russia), Olga K. Sil'chenko (Sternberg, Astronomical Institute of the Lomonosov Moscow State University, Moscow,, Russia)
TL;DR
This study investigates star formation in outer rings of early-type disk galaxies, revealing that regular rings often host young stars, and pseudorings in spirals almost always have ongoing star formation.
Contribution
It provides the first large-scale analysis of star formation activity in outer rings of early-type disk galaxies using Spitzer data.
Findings
Regular rings show young stars less than 200 Myr old in about half the cases.
Pseudorings in spiral galaxies almost always have ongoing star formation.
Star formation activity varies between different types of outer rings.
Abstract
We have searched for presence of current star formation in outer stellar rings of early-type disk (S0-Sb) galaxies by inspecting a representative sample of nearby galaxies with rings from the recent Spitzer catalog ARRAKIS (Comeron et al. 2014). We have found that regular rings (of R-type) reveal young stellar population with the age of less than 200~Myr in about half of all the cases, while in the pseudorings (open rings, R'), which inhabit only spiral galaxies, current star formation proceeds almost always.
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