@Article{WerleFACBCCHOSRAS:2020:ClHiEa,
               author = "Werle, Ariel and Fernandes, R. Cid and Asari, Natalia Vale and 
                         Coelho, Paula R. T. and Bruzual Alfonso, Gustavo and Charlot, S. 
                         and Carvalho, R. R. de and Herpich, F{\'a}bio R. and Oliveira, C. 
                         Mendes de and Sodr{\'e} J{\'u}nior, Laerte and Ruschel Dutra, D. 
                         and Amorim, A. de and Sampaio, Vitor Medeiros",
          affiliation = "{Osservatorio Astronomico di Padova} and {Universidade Federal de 
                         Santa Catarina (UFSC)} and {Universidade Federal de Santa Catarina 
                         (UFSC)} and {Universidade de S{\~a}o Paulo (USP)} and 
                         {Universidad Nacional Autonoma de M{\'e}xico} and {Sorbonne 
                         Universites} and {Universidade Cidade de S{\~a}o Paulo} and 
                         {Universidade de S{\~a}o Paulo (USP)} and {Universidade de 
                         S{\~a}o Paulo (USP)} and {Universidade de S{\~a}o Paulo (USP)} 
                         and {Universidade Federal de Santa Catarina (UFSC)} and 
                         {Universidade Federal de Santa Catarina (UFSC)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Clues on the history of early-type galaxies from SDSS spectra and 
                         GALEX photometry",
              journal = "Monthly Notices of the Royal Astronomical Society",
                 year = "2020",
               volume = "497",
               number = "3",
                pages = "3251--3263",
                month = "Sept.",
             keywords = "galaxies: elliptical and lenticular, cD, galaxies: evolution, 
                         galaxies: stellar content, ultraviolet: galaxies.",
             abstract = "Stellar population studies of early-type galaxies (ETGs) based on 
                         their optical stellar continuum suggest that these are quiescent 
                         systems. However, emission lines and ultraviolet photometry reveal 
                         a diverse population. We use a new version of the STARLIGHT 
                         spectral synthesis code and state-of-the-art stellar population 
                         models to simultaneously fit Sloan Digital Sky Survey spectra and 
                         Galaxy Evolution Explorer photometry for a sample of 3453 galaxies 
                         at z < 0.1 with near ultraviolet (NUV) - r > 5 that are classified 
                         as elliptical by Galaxy Zoo. We reproduce far ultraviolet (FUV) 
                         magnitudes for 80 per cent of UV upturn galaxies selected using 
                         criteria from the literature, suggesting that additional stellar 
                         population ingredients such as binaries and extreme horizontal 
                         branch stars may have a limited contribution to the UV upturn. The 
                         addition of ultraviolet data leads to a broadening of the 
                         distributions of mean stellar ages, metallicities, and 
                         attenuation. Stellar populations younger than 1 Gyr are required 
                         to reproduce the ultraviolet emission in 17 per cent of our 
                         sample. These systems represent 43 per cent of the sample at 5 < 
                         NUV - r < 5.5 and span the same stellar mass range as other ETGs 
                         in our sample. ETGs with young stellar components have larger 
                         H-alpha equivalent widths (W-H alpha) and larger dust attenuation. 
                         Emission line ratios and W-H alpha indicate that the ionizing 
                         source in these systems is a mixture of young and old stellar 
                         populations. Their young stellar populations are metal-poor, 
                         especially for high-mass galaxies, indicating recent star 
                         formation associated with rejuvenation events triggered by 
                         external processes, such as minor mergers.",
                  doi = "10.1093/mnras/staa2217",
                  url = "http://dx.doi.org/10.1093/mnras/staa2217",
                 issn = "0035-8711 and 1365-2966",
             language = "en",
           targetfile = "werle_clues.pdf",
        urlaccessdate = "09 maio 2024"
}