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Date and Time of the Query: 2019-03-19 T13:08:26 PDT
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For refcode 2011ApJ...736..154M:
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2011ApJ...736..154M Tracing Rejuvenation Events in Nearby S0 Galaxies Marino, Antonietta; Bianchi, Luciana; Rampazzo, Roberto; Thilker, David A.; Annibali, Francesca; Bressan, Alessandro; Buson, Lucio Maria Abstract. With the aim of characterizing rejuvenation processes in early-type galaxies, we analyzed five barred S0 galaxies showing a prominent outer ring in ultraviolet (UV) imaging. We analyzed Galaxy Evolution Explorer far-UV (FUV) and near-UV (NUV), and optical data using stellar population models and estimated the age and the stellar mass of the entire galaxies and the UV-bright ring structures. Outer rings consist of young (<~200 Myr old) stellar populations, accounting for up to 70% of the FUV flux but containing only a few percent of the total stellar mass. Integrated photometry of the whole galaxies places four of these objects on the green valley, indicating a globally evolving nature. We suggest such galaxy evolution is likely driven by bar-induced instabilities, i.e., inner secular evolution, that conveys gas to the nucleus and the outer rings. At the same time, H I observations of NGC 1533 and NGC 2962 suggest external gas re-fueling can play a role in the rejuvenation processes of such galaxies. Key words: galaxies: elliptical and lenticular, cD, galaxies: evolution, galaxies: formation, galaxies: structure
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