Clues on the history of early-type galaxies from SDSS spectra and GALEX photometry
Abstract
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 α equivalent widths (WH α) and larger dust attenuation. Emission line ratios and WH α 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.
- Authors:
-
[1];
[3];
[4];
[5];
[4];
[4];
- INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, I-35122 Padova, Italy, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, R. do Matão 1226, 05508-090 São Paulo, SP, Brazil, Departamento de Física, CFM, Universidade Federal de Santa Catarina, PO Box 476, 88040-900 Florianopolis, SC, Brazil
- Departamento de Física, CFM, Universidade Federal de Santa Catarina, PO Box 476, 88040-900 Florianopolis, SC, Brazil
- Departamento de Física, CFM, Universidade Federal de Santa Catarina, PO Box 476, 88040-900 Florianopolis, SC, Brazil, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK
- Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, R. do Matão 1226, 05508-090 São Paulo, SP, Brazil
- Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, Morelia, Michoacán 58089, México
- Institut d’Astrophysique de Paris, Sorbonne Universités, UPMC-CNRS, UMR7095, F-75014,Paris, France
- NAT - Universidade Cruzeiro do Sul/Universidade Cidade de São Paulo, Rua Galvão Bueno, 868, 01506-000 São Paulo, SP, Brazil
- NAT - Universidade Cruzeiro do Sul/Universidade Cidade de São Paulo, Rua Galvão Bueno, 868, 01506-000 São Paulo, SP, Brazil, Instituto Nacional de Pesquisas Espaciais/MCT, Av. dos Astronautas 1758, 12227-010 São José dos Campos, SP, Brazil
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1647479
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 497 Journal Issue: 3; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Werle, A., Cid Fernandes, R., Vale Asari, N., Coelho, P. R. T., Bruzual, G., Charlot, S., de Carvalho, R. R., Herpich, F. R., Mendes de Oliveira, C., Sodré, Jr, L., Ruschel-Dutra, D., de Amorim, A., and Sampaio, V. M. Clues on the history of early-type galaxies from SDSS spectra and GALEX photometry. United Kingdom: N. p., 2020.
Web. doi:10.1093/mnras/staa2217.
Werle, A., Cid Fernandes, R., Vale Asari, N., Coelho, P. R. T., Bruzual, G., Charlot, S., de Carvalho, R. R., Herpich, F. R., Mendes de Oliveira, C., Sodré, Jr, L., Ruschel-Dutra, D., de Amorim, A., & Sampaio, V. M. Clues on the history of early-type galaxies from SDSS spectra and GALEX photometry. United Kingdom. https://doi.org/10.1093/mnras/staa2217
Werle, A., Cid Fernandes, R., Vale Asari, N., Coelho, P. R. T., Bruzual, G., Charlot, S., de Carvalho, R. R., Herpich, F. R., Mendes de Oliveira, C., Sodré, Jr, L., Ruschel-Dutra, D., de Amorim, A., and Sampaio, V. M. Thu .
"Clues on the history of early-type galaxies from SDSS spectra and GALEX photometry". United Kingdom. https://doi.org/10.1093/mnras/staa2217.
@article{osti_1647479,
title = {Clues on the history of early-type galaxies from SDSS spectra and GALEX photometry},
author = {Werle, A. and Cid Fernandes, R. and Vale Asari, N. and Coelho, P. R. T. and Bruzual, G. and Charlot, S. and de Carvalho, R. R. and Herpich, F. R. and Mendes de Oliveira, C. and Sodré, Jr, L. and Ruschel-Dutra, D. and de Amorim, A. and Sampaio, V. M.},
abstractNote = {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 α equivalent widths (WH α) and larger dust attenuation. Emission line ratios and WH α 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},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 497,
place = {United Kingdom},
year = {Thu Aug 06 00:00:00 EDT 2020},
month = {Thu Aug 06 00:00:00 EDT 2020}
}
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The SAURON project - XIII. SAURON-GALEX study of early-type galaxies: the ultraviolet colour-magnitude relations and Fundamental Planes
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Circumstellar dust, PAHs and stellar populations in early-type galaxies: insights from GALEX and WISE
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Semi-empirical analysis of Sloan Digital Sky Survey galaxies - III. How to distinguish AGN hosts
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parsec evolutionary tracks of massive stars up to 350 M ⊙ at metallicities 0.0001 ≤ Z ≤ 0.04
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Why do many early-type galaxies lack emission lines? I. Fossil clues
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A grid of synthetic ionizing spectra for very hot compact stars from NLTE model atmospheres
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New Strong-Line Abundance Diagnostics for h ii Regions: Effects of κ-Distributed Electron Energies and new Atomic data
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UV-BRIGHT NEARBY EARLY-TYPE GALAXIES OBSERVED IN THE MID-INFRARED: EVIDENCE FOR A MULTI-STAGE FORMATION HISTORY BY WAY OF WISE AND GALEX IMAGING
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Modeling the Panchromatic Spectral Energy Distributions of Galaxies
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The Galaxy Evolution Explorer : A Space Ultraviolet Survey Mission
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Evidence for Non-smooth Quenching in Massive Galaxies at z ∼ 1
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Fitting the integrated spectral energy distributions of galaxies
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UV bright red-sequence galaxies: how do UV upturn systems evolve in redshift and stellar mass?
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The Wide-Field Infrared Survey Explorer (Wise): Mission Description and Initial On-Orbit Performance
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Galaxy Zoo: morphologies derived from visual inspection of galaxies from the Sloan Digital Sky Survey ★
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Fake star Formation Bursts: blue Horizontal Branch Stars Masquerade as Young Massive Stars in Optical Integrated Light Spectroscopy
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Rejuvenation in z ∼ 0.8 Quiescent Galaxies in LEGA-C
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