Simultaneous spectroscopic and photometric analysis of galaxies with STARLIGHT: CALIFA+GALEX
We present an extended version of the spectral synthesis code STARLIGHT designed to incorporate both λ-by-λ spectra and photometric fluxes in the estimation of stellar population properties of galaxies. The code is tested with simulations and data for 260 galaxies culled from the Calar Alto Legacy I...
| Autores: | , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:dnet:digitalcsic_::80171c46ad6a260eeaa75c0956aad8cb |
| Acceso en línea: | http://hdl.handle.net/10261/150393 |
| Access Level: | acceso abierto |
| Palabra clave: | Galaxies: evolution Techniques: spectroscopic Techniques: photometric |
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Simultaneous spectroscopic and photometric analysis of galaxies with STARLIGHT: CALIFA+GALEX López Fernández, R. Cid Fernandes, Roberto González Delgado, Rosa M. Vale Asari, N. Pérez Jiménez, Enrique García-Benito, Rubén de Amorim, A.L. Lacerda, E. Cortijo Ferrero, Clara Sánchez, S.F. Galaxies: evolution Techniques: spectroscopic Techniques: photometric We present an extended version of the spectral synthesis code STARLIGHT designed to incorporate both λ-by-λ spectra and photometric fluxes in the estimation of stellar population properties of galaxies. The code is tested with simulations and data for 260 galaxies culled from the Calar Alto Legacy Integral Field Area (CALIFA) survey, spatially matching the 3700-7000 Å optical data cubes to Galaxy Evolution Explorer (GALEX) near-ultraviolet (NUV) and farultraviolet (FUV) images. The sample spans E-Sd galaxies with masses from 10 to 10M⊙ and stellar populations all the way from star-forming to old, passive systems. Comparing results derived from purely optical fits with those which also consider the NUV and FUV data we find that the following. (1) The new code is capable of matching the input ultraviolet (UV) data within the errors while keeping the quality of the optical fit essentially unchanged. (2) Despite being unreliable predictors of the UV fluxes, purely optical fits yield stellar population properties which agree well with those obtained in optical+UV fits for nearly 90 per cent of our sample. (3) The addition of UV constraints has little impact on properties such as stellar mass and dust optical depth. Mean stellar ages and metallicities also remain nearly the same for most galaxies, the exception being low-mass, late-type galaxies, which become older and less enriched due to rearrangements of their youngest populations. (4) The revised ages are better correlated with observables such as the 4000 Å break index, and the NUV - r and u - r colours, an empirical indication that the addition of UV constraints helps mitigating the effects of age-metallicity-extinction degeneracies. © 2016 The Authors. Support from the Spanish Ministerio de Econom´ıa y Competitividad, through projects AYA2014-57490-P, AYA2010-15081 (PI RGD), Junta de Andaluc´ıa FQ1580 (PI RGD), AYA2010-22111-C03-03, AYA2010-10904E (SFS), and short-term research FPI program grants EEBB-I-2013-07071 and EEBB-I-2014-08601. SFS thanks the CONACYT-125180 and DGAPA-IA100815 projects for providing him support in this study. We also thank the Viabilidad, Diseno, ˜ Acceso y Mejora funding program, ICTS-2009-10, for funding the data acquisition of this project. Support from the Brazilian Science Galaxy spectrophotometry with STARLIGHT 199 without borders program, as well as CNPq and CAPES is duly acknowledged. This research made use of Montage. It is funded by the National Science Foundation under Grant Number ACI- 1440620, and was previously funded by the National Aeronautics and Space Administration’s Earth Science Technology Office, Computation Technologies Project, under Cooperative Agreement Number NCC5-626 between NASA and the California Institute of Technology Peer Reviewed Oxford University Press http://hdl.handle.net/10261/150393 |
| title |
Simultaneous spectroscopic and photometric analysis of galaxies with STARLIGHT: CALIFA+GALEX |
| spellingShingle |
Simultaneous spectroscopic and photometric analysis of galaxies with STARLIGHT: CALIFA+GALEX López Fernández, R. Galaxies: evolution Techniques: spectroscopic Techniques: photometric |
| title_short |
Simultaneous spectroscopic and photometric analysis of galaxies with STARLIGHT: CALIFA+GALEX |
| title_full |
Simultaneous spectroscopic and photometric analysis of galaxies with STARLIGHT: CALIFA+GALEX |
| title_fullStr |
Simultaneous spectroscopic and photometric analysis of galaxies with STARLIGHT: CALIFA+GALEX |
| title_full_unstemmed |
Simultaneous spectroscopic and photometric analysis of galaxies with STARLIGHT: CALIFA+GALEX |
| title_sort |
Simultaneous spectroscopic and photometric analysis of galaxies with STARLIGHT: CALIFA+GALEX |
| author |
López Fernández, R. |
| author_facet |
López Fernández, R. Cid Fernandes, Roberto González Delgado, Rosa M. Vale Asari, N. Pérez Jiménez, Enrique García-Benito, Rubén de Amorim, A.L. Lacerda, E. Cortijo Ferrero, Clara Sánchez, S.F. |
| author_role |
author |
| author2 |
Cid Fernandes, Roberto González Delgado, Rosa M. Vale Asari, N. Pérez Jiménez, Enrique García-Benito, Rubén de Amorim, A.L. Lacerda, E. Cortijo Ferrero, Clara Sánchez, S.F. |
| author2_role |
author author author author author author author author author |
| topic |
Galaxies: evolution Techniques: spectroscopic Techniques: photometric |
| topic_facet |
Galaxies: evolution Techniques: spectroscopic Techniques: photometric |
| description |
We present an extended version of the spectral synthesis code STARLIGHT designed to incorporate both λ-by-λ spectra and photometric fluxes in the estimation of stellar population properties of galaxies. The code is tested with simulations and data for 260 galaxies culled from the Calar Alto Legacy Integral Field Area (CALIFA) survey, spatially matching the 3700-7000 Å optical data cubes to Galaxy Evolution Explorer (GALEX) near-ultraviolet (NUV) and farultraviolet (FUV) images. The sample spans E-Sd galaxies with masses from 10 to 10M⊙ and stellar populations all the way from star-forming to old, passive systems. Comparing results derived from purely optical fits with those which also consider the NUV and FUV data we find that the following. (1) The new code is capable of matching the input ultraviolet (UV) data within the errors while keeping the quality of the optical fit essentially unchanged. (2) Despite being unreliable predictors of the UV fluxes, purely optical fits yield stellar population properties which agree well with those obtained in optical+UV fits for nearly 90 per cent of our sample. (3) The addition of UV constraints has little impact on properties such as stellar mass and dust optical depth. Mean stellar ages and metallicities also remain nearly the same for most galaxies, the exception being low-mass, late-type galaxies, which become older and less enriched due to rearrangements of their youngest populations. (4) The revised ages are better correlated with observables such as the 4000 Å break index, and the NUV - r and u - r colours, an empirical indication that the addition of UV constraints helps mitigating the effects of age-metallicity-extinction degeneracies. © 2016 The Authors. |
| publishDate |
2016 |
| format |
article |
| status_str |
publishedVersion |
| url |
http://hdl.handle.net/10261/150393 |
| eu_rights_str_mv |
openAccess |
| publisher |
Oxford University Press |
| institution |
Consejo Superior de Investigaciones Científicas (CSIC) |
| collection |
DIGITAL.CSIC. Repositorio Institucional del CSIC |
| reponame_str |
DIGITAL.CSIC. Repositorio Institucional del CSIC |
| instname_str |
Consejo Superior de Investigaciones Científicas (CSIC) |
| _version_ |
1878436835956359168 |
| publishDateSort |
2016 |
| author_browse |
Cid Fernandes, Roberto Cortijo Ferrero, Clara García-Benito, Rubén González Delgado, Rosa M. Lacerda, E. López Fernández, R. Pérez Jiménez, Enrique Sánchez, S.F. Vale Asari, N. de Amorim, A.L. |
| publisherStr |
Oxford University Press |
| score |
6.924472 |