The O3N2 and N2 abundance indicators revisited: improved calibrations based on CALIFA and T_e-based literature data

The use of integral field spectroscopy is since recently allowing to measure the emission line fluxes of an increasingly large number of star-forming galaxies, both locally and at high redshift. Many studies have used these fluxes to derive the gas-phase metallicity of the galaxies by applying the s...

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Detalhes bibliográficos
Autores: Marino, Raffaella Anna, Gil De Paz, Armando, Castillo Morales, María África
Tipo de documento: artigo
Data de publicação:2013
País:España
Recursos:Universidad Complutense de Madrid (UCM)
Repositório:Docta Complutense
Idioma:inglês
OAI Identifier:oai:docta.ucm.es:20.500.14352/35014
Acesso em linha:https://hdl.handle.net/20.500.14352/35014
Access Level:Acceso aberto
Palavra-chave:52
H-II regions
Star-forming galaxies
Integral field spectroscopy
Mass-metallicity relation
Digital sky survey
Potsdam multiaperture spectrophotometer
Localized chemical pollution
Ionized-gas
Oxygen abundances
Astrofísica
Astronomía (Física)
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spelling The O3N2 and N2 abundance indicators revisited: improved calibrations based on CALIFA and T_e-based literature dataMarino, Raffaella AnnaGil De Paz, ArmandoCastillo Morales, María África52H-II regionsStar-forming galaxiesIntegral field spectroscopyMass-metallicity relationDigital sky surveyPotsdam multiaperture spectrophotometerLocalized chemical pollutionIonized-gasOxygen abundancesAstrofísicaAstronomía (Física)The use of integral field spectroscopy is since recently allowing to measure the emission line fluxes of an increasingly large number of star-forming galaxies, both locally and at high redshift. Many studies have used these fluxes to derive the gas-phase metallicity of the galaxies by applying the so-called strong-line methods. However, the metallicity indicators that these datasets use were empirically calibrated using few direct abundance data points (T_e-based measurements). Furthermore, a precise determination of the prediction intervals of these indicators is commonly lacking in these calibrations. Such limitations might lead to systematic errors in determining the gas-phase metallicity, especially at high redshift, which might have a strong impact on our understanding of the chemical evolution of the Universe. The main goal of this study is to review the most widely used empirical oxygen calibrations, O3N2 and N2, by using new direct abundance measurements. We pay special attention to (1) the expected uncertainty of these calibrations as a function of the index value or abundance derived and (2) the presence of possible systematic offsets. This is possible thanks to the analysis of the most ambitious compilation of T_e-based H II regions to date. This new dataset compiles the Te-based abundances of 603 H II regions extracted from the literature but also includes new measurements from the CALIFA survey. Besides providing new and improved empirical calibrations for the gas abundance, we also present a comparison between our revisited calibrations with a total of 3423 additional CALIFA H II complexes with abundances derived using the ONS calibration from the literature. The combined analysis of T_e-based and ONS abundances allows us to derive their most accurate calibration to date for both the O3N2 and N2 single-ratio indicators, in terms of all statistical significance, quality, and coverage of the parameters space. In particular, we infer that these indicators show shallower abundance dependencies and statistically significant offsets compared to others'. The O3N2 and N2 indicators can be empirically applied to derive oxygen abundances calibrations from either direct abundance determinations with random errors of 0.18 and 0.16, respectively, or from indirect ones (but based on a large amount of data), reaching an average precision of 0.08 and 0.09 dex (random) and 0.02 and 0.08 dex (systematic; compared to the direct estimations), respectively.EDP ScienciesUniversidad Complutense de Madrid20132013-11-0120132013-11-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/35014reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/350142026-06-02T12:44:21Z
dc.title.none.fl_str_mv The O3N2 and N2 abundance indicators revisited: improved calibrations based on CALIFA and T_e-based literature data
title The O3N2 and N2 abundance indicators revisited: improved calibrations based on CALIFA and T_e-based literature data
spellingShingle The O3N2 and N2 abundance indicators revisited: improved calibrations based on CALIFA and T_e-based literature data
Marino, Raffaella Anna
52
H-II regions
Star-forming galaxies
Integral field spectroscopy
Mass-metallicity relation
Digital sky survey
Potsdam multiaperture spectrophotometer
Localized chemical pollution
Ionized-gas
Oxygen abundances
Astrofísica
Astronomía (Física)
title_short The O3N2 and N2 abundance indicators revisited: improved calibrations based on CALIFA and T_e-based literature data
title_full The O3N2 and N2 abundance indicators revisited: improved calibrations based on CALIFA and T_e-based literature data
title_fullStr The O3N2 and N2 abundance indicators revisited: improved calibrations based on CALIFA and T_e-based literature data
title_full_unstemmed The O3N2 and N2 abundance indicators revisited: improved calibrations based on CALIFA and T_e-based literature data
title_sort The O3N2 and N2 abundance indicators revisited: improved calibrations based on CALIFA and T_e-based literature data
dc.creator.none.fl_str_mv Marino, Raffaella Anna
Gil De Paz, Armando
Castillo Morales, María África
author Marino, Raffaella Anna
author_facet Marino, Raffaella Anna
Gil De Paz, Armando
Castillo Morales, María África
author_role author
author2 Gil De Paz, Armando
Castillo Morales, María África
author2_role author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 52
H-II regions
Star-forming galaxies
Integral field spectroscopy
Mass-metallicity relation
Digital sky survey
Potsdam multiaperture spectrophotometer
Localized chemical pollution
Ionized-gas
Oxygen abundances
Astrofísica
Astronomía (Física)
topic 52
H-II regions
Star-forming galaxies
Integral field spectroscopy
Mass-metallicity relation
Digital sky survey
Potsdam multiaperture spectrophotometer
Localized chemical pollution
Ionized-gas
Oxygen abundances
Astrofísica
Astronomía (Física)
description The use of integral field spectroscopy is since recently allowing to measure the emission line fluxes of an increasingly large number of star-forming galaxies, both locally and at high redshift. Many studies have used these fluxes to derive the gas-phase metallicity of the galaxies by applying the so-called strong-line methods. However, the metallicity indicators that these datasets use were empirically calibrated using few direct abundance data points (T_e-based measurements). Furthermore, a precise determination of the prediction intervals of these indicators is commonly lacking in these calibrations. Such limitations might lead to systematic errors in determining the gas-phase metallicity, especially at high redshift, which might have a strong impact on our understanding of the chemical evolution of the Universe. The main goal of this study is to review the most widely used empirical oxygen calibrations, O3N2 and N2, by using new direct abundance measurements. We pay special attention to (1) the expected uncertainty of these calibrations as a function of the index value or abundance derived and (2) the presence of possible systematic offsets. This is possible thanks to the analysis of the most ambitious compilation of T_e-based H II regions to date. This new dataset compiles the Te-based abundances of 603 H II regions extracted from the literature but also includes new measurements from the CALIFA survey. Besides providing new and improved empirical calibrations for the gas abundance, we also present a comparison between our revisited calibrations with a total of 3423 additional CALIFA H II complexes with abundances derived using the ONS calibration from the literature. The combined analysis of T_e-based and ONS abundances allows us to derive their most accurate calibration to date for both the O3N2 and N2 single-ratio indicators, in terms of all statistical significance, quality, and coverage of the parameters space. In particular, we infer that these indicators show shallower abundance dependencies and statistically significant offsets compared to others'. The O3N2 and N2 indicators can be empirically applied to derive oxygen abundances calibrations from either direct abundance determinations with random errors of 0.18 and 0.16, respectively, or from indirect ones (but based on a large amount of data), reaching an average precision of 0.08 and 0.09 dex (random) and 0.02 and 0.08 dex (systematic; compared to the direct estimations), respectively.
publishDate 2013
dc.date.none.fl_str_mv 2013
2013-11-01
2013
2013-11-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/35014
url https://hdl.handle.net/20.500.14352/35014
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv EDP Sciencies
publisher.none.fl_str_mv EDP Sciencies
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.300724

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