期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 497, 期 3, 页码 3251-3263出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa2217
关键词
galaxies: elliptical and lenticular, cD; galaxies: evolution; galaxies: stellar content; ultraviolet: galaxies
资金
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2019/01768-6, 2018/05392-8]
- Conselho Nacional de Desenvolvimento Cientfico e Tecnolgico (CNPq) [302270/2018-3]
- Royal Society
- Newton Fund [NAF\R1\180403]
- Fundacao de Amparo a Pesquisa e Inovacao de Santa Catarina (FAPESC)
- Conselho Nacional de Desenvolvimento Cient'ifico e Tecnologico (CNPq)
- National Autonomous University of Mexico (UNAM) [DGAPA/PAPIIT IG100319]
- CONACyT [CB2015-252364]
- FAPESP [2012/00800-4, APR 2019/11910-4, 2014/111564]
- CNPq [PQ 309209/2019-6, 304819/2017-4]
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- American Museum of Natural History
- Astrophysical Institute Potsdam
- University of Basel
- University of Cambridge
- Case Western Reserve University
- University of Chicago
- Drexel University
- Fermilab
- Institute for Advanced Study
- Japan Participation Group
- Johns Hopkins University
- Joint Institute for Nuclear Astrophysics
- Kavli Institute for Particle Astrophysics and Cosmology
- Korean Scientist Group
- Chinese Academy of Sciences (LAMOST)
- Los Alamos National Laboratory
- MaxPlanck-Institute for Astronomy (MPIA)
- Max-Planck-Institute for Astrophysics (MPA)
- New Mexico State University
- Ohio State University
- University of Pittsburgh
- University of Portsmouth
- Princeton University
- United States Naval Observatory
- University ofWashington
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [310041/2018-0]
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.
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