Abundance determination from global emission-line SDSS spectra: Exploring objects with high N/O ratios

We have compared the oxygen and nitrogen abundances derived from global emission-line Sloan Digital Sky Survey (SDSS) spectra of galaxies using (1) the T e method and (2) two recent strong-line calibrations: the ON and NS calibrations. Using the T e method, anomalously high N/O abundance ratios have...

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Detalles Bibliográficos
Autores: Pilyugin, L.S., Vílchez Medina, José Manuel, Mattsson, L., Thuan, T. X.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2012
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/423972
Acceso en línea:http://hdl.handle.net/10261/423972
Access Level:acceso abierto
Palabra clave:ISM: abundances
H II regions
Galaxies: abundances
id ES_becf583f85e02fd76ff221f3c81eff7b
oai_identifier_str oai:digital.csic.es:10261/423972
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv Abundance determination from global emission-line SDSS spectra: Exploring objects with high N/O ratios
title Abundance determination from global emission-line SDSS spectra: Exploring objects with high N/O ratios
spellingShingle Abundance determination from global emission-line SDSS spectra: Exploring objects with high N/O ratios
Pilyugin, L.S.
ISM: abundances
H II regions
Galaxies: abundances
title_short Abundance determination from global emission-line SDSS spectra: Exploring objects with high N/O ratios
title_full Abundance determination from global emission-line SDSS spectra: Exploring objects with high N/O ratios
title_fullStr Abundance determination from global emission-line SDSS spectra: Exploring objects with high N/O ratios
title_full_unstemmed Abundance determination from global emission-line SDSS spectra: Exploring objects with high N/O ratios
title_sort Abundance determination from global emission-line SDSS spectra: Exploring objects with high N/O ratios
dc.creator.none.fl_str_mv Pilyugin, L.S.
Vílchez Medina, José Manuel
Mattsson, L.
Thuan, T. X.
author Pilyugin, L.S.
author_facet Pilyugin, L.S.
Vílchez Medina, José Manuel
Mattsson, L.
Thuan, T. X.
author_role author
author2 Vílchez Medina, José Manuel
Mattsson, L.
Thuan, T. X.
author2_role author
author
author
dc.contributor.none.fl_str_mv Ministerio de Educación y Ciencia (España)
Ministerio de Ciencia e Innovación (España)
Alfred P. Sloan Foundation
National Science Foundation (US)
NASA
Japanese Government
Max Planck Society
Higher Education Funding Council for England
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv ISM: abundances
H II regions
Galaxies: abundances
topic ISM: abundances
H II regions
Galaxies: abundances
description We have compared the oxygen and nitrogen abundances derived from global emission-line Sloan Digital Sky Survey (SDSS) spectra of galaxies using (1) the T e method and (2) two recent strong-line calibrations: the ON and NS calibrations. Using the T e method, anomalously high N/O abundance ratios have been found in some SDSS galaxies. To investigate this, we have Monte Carlo simulated the global spectra of composite nebulae by a mix of spectra of individual components, based on spectra of well-studied Hii regions in nearby galaxies. We found that the T e method results in an underestimated oxygen abundance (and hence in an overestimated nitrogen-to-oxygen ratio) if Hii regions with different physical properties contribute to the global spectrum of composite nebulae. This effect is somewhat similar to the small-scale temperature fluctuations in Hii regions discussed by Peimbert. Our work thus suggests that the high T e-based N/O abundance ratios found in SDSS galaxies may not be real. However, such an effect is not expected to be present in dwarf galaxies since they generally have a uniform chemical composition. The ON and NS calibrations give O and N abundances in composite nebulae which agree with the mean luminosity-weighted abundances of their components to within ~0.2dex. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.
publishDate 2012
dc.date.none.fl_str_mv 2012
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/423972
url http://hdl.handle.net/10261/423972
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
AYA2010-21887-C04-01/ES/ESTALLIDOS Y SU HUELLA EN LA EVOLUCION COSMICA DE LAS GALAXIAS/
info:eu-repo/grantAgreement/MICINN//CSD2006-00070
http://dx.doi.org/10.1111/j.1365-2966.2012.20420.x
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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spelling Abundance determination from global emission-line SDSS spectra: Exploring objects with high N/O ratiosPilyugin, L.S.Vílchez Medina, José ManuelMattsson, L.Thuan, T. X.ISM: abundancesH II regionsGalaxies: abundancesWe have compared the oxygen and nitrogen abundances derived from global emission-line Sloan Digital Sky Survey (SDSS) spectra of galaxies using (1) the T e method and (2) two recent strong-line calibrations: the ON and NS calibrations. Using the T e method, anomalously high N/O abundance ratios have been found in some SDSS galaxies. To investigate this, we have Monte Carlo simulated the global spectra of composite nebulae by a mix of spectra of individual components, based on spectra of well-studied Hii regions in nearby galaxies. We found that the T e method results in an underestimated oxygen abundance (and hence in an overestimated nitrogen-to-oxygen ratio) if Hii regions with different physical properties contribute to the global spectrum of composite nebulae. This effect is somewhat similar to the small-scale temperature fluctuations in Hii regions discussed by Peimbert. Our work thus suggests that the high T e-based N/O abundance ratios found in SDSS galaxies may not be real. However, such an effect is not expected to be present in dwarf galaxies since they generally have a uniform chemical composition. The ON and NS calibrations give O and N abundances in composite nebulae which agree with the mean luminosity-weighted abundances of their components to within ~0.2dex. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.We are grateful to the referee for his/her constructive com- ments. LSP acknowledges partial funding from the sabbatical grant SAB2010-0054 of the Ministerio de Education of Spain and sup- port from the Cosmomicrophysics project of the National Academy of Sciences of Ukraine. JMV and LSP acknowledge the partial support of AYA2010-21887-C04-01 from the Spanish PNAYA and CSD2006-00070 from CONSOLIDER 2010 programme of MICINN. LSP thanks the hospitality of the Instituto de Astrof´ısica de Andaluc´ıa where this investigation was carried out. The Dark Cosmology Centre is funded by the Danish National Research Foundation. Funding for the SDSS and SDSS-II has been provided by the Al- fred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the US Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbuka- gakusho, the Max Planck Society, and the Higher Education Fund- ing Council for England. The SDSS website is http://www.sdss.org/. The SDSS is managed by the Astrophysical Research Consor- tium for the Participating Institutions. The Participating Institutions are the American Museum of Natural History, Astrophysical Insti- tute Potsdam, University of Basel, University of Cambridge, Case Western Reserve University, University of Chicago, Drexel Univer- sity, Fermilab, the Institute for Advanced Study, the Japan Partic- ipation Group, The Johns Hopkins University, the Joint Institute for Nuclear Astrophysics, the Kavli Institute for Particle Astro- physics and Cosmology, the Korean Scientist Group, the Chinese Academy of Sciences (LAMOST), Los Alamos National Labora- tory, the Max-Planck-Institute for Astronomy (MPIA), the Max- Planck-Institute for Astrophysics (MPA), New Mexico State Uni- versity, Ohio State University, University of Pittsburgh, University of Portsmouth, Princeton University, the United States Naval Ob- servatory and the University of Washington.Peer reviewedOxford University PressMinisterio de Educación y Ciencia (España)Ministerio de Ciencia e Innovación (España)Alfred P. Sloan FoundationNational Science Foundation (US)NASAJapanese GovernmentMax Planck SocietyHigher Education Funding Council for EnglandConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202620262012info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/423972reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#AYA2010-21887-C04-01/ES/ESTALLIDOS Y SU HUELLA EN LA EVOLUCION COSMICA DE LAS GALAXIAS/info:eu-repo/grantAgreement/MICINN//CSD2006-00070http://dx.doi.org/10.1111/j.1365-2966.2012.20420.xSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4239722026-05-22T06:33:51Z
score 15,81155

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