Signatures of recent star formation in ring S0 galaxies

Details Signatures of recent star formation in ring S0 galaxies Signatures of recent star formation in ring S0 galaxies

2011-01-05

arxiv.org/abs/1101.0903v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Conference "UV Universe 2010" S. Petersburg 31 May 3 June 2010, Accepted for publication in Astrophysics & Space Science. The

Scientific paper

10.1007/s10509-010-0588-3

We present a study of the stellar populations of ring and/or arm-like structures in a sample of S0 galaxies using GALEX far- and near-ultraviolet imaging and SDSS optical data. Such structures are prominent in the UV and reveal recent star formation. We quantitatively characterize these rejuvenation events, estimating the average age and stellar mass of the ring structures, as well as of the entire galaxy. The mass fraction of the UV-bright rings is a few percent of the total galaxy mass, although the UV ring luminosity reaches 70% of the galaxy luminosity. The integrated colors of these S0s locates them in the red sequence (NGC 2962) and in the so-called green valley. We suggest that the star formation episodes may be induced by different triggering mechanisms, such as the inner secular evolution driven by bars, and interaction episodes.

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