Large-Scale Outer Rings of Early-type Disk Galaxies

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.

arXiv comment25 pages, 7 figures; slightly edited version of the paper published presently in the Astrophysical Bulletin v. 70, no.3, pp.280-291

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• Magnetic fields in ring galaxies
• Star formation in outer rings of S0 galaxies. II. NGC 4513 -- a multi-spin ringed S0 galaxy
• Star formation in outer rings of S0 galaxies. IV. NGC 254 -- a double-ringed S0 with gas counter-rotation
• Star Formation in Outer Rings of S0 galaxies. V. UGC 4599 -- an S0 with gas probably accreted from a filament
• Star formation in outer rings of S0 galaxies. III. UGC 5936 -- an S0 with currently accreted satellite matter
• Galaxies with 'Rows': A New Catalog
• Far-infrared - radio correlation and magnetic field strength in star-forming early-type galaxies
• Using the EAGLE simulations to elucidate the origin of disc surface brightness profile breaks as a function of mass and environment