Photoionization models of the CALIFA H II regions: I. Hybrid models

Autores
Morisset, C.; Delgado-Inglada, G.; Sánchez, S. F.; Galbany, L.; Garciá-Benito, R.; Husemann, B.; Marino, R. A.; Mast, Damian; Roth, M. M.
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Photoionization models of H II regions require as input a description of the ionizing spectral energy distribution (SED) and of the gas distribution, in terms of ionization parameter U and chemical abundances (e.g., O/H and N/O).A strong degeneracy exists between the hardness of the SED and U, which in turn leads to high uncertainties in the determination of the other parameters, including abundances. One way to resolve the degeneracy is to fix one of the parameters using additional information. For each of the ~20 000 sources of the CALIFA H II regions catalog, a grid of photoionization models is computed assuming the ionizing SED to be described by the underlying stellar population obtained from spectral synthesis modeling. The ionizing SED is then defined as the sum of various stellar bursts of different ages and metallicities. This solves the degeneracy between the shape of the ionizing SED and U. The nebular metallicity (associated with O/H) is defined using the classical strong line method O3N2 (which gives our models the status of “hybrids”). The remaining free parameters are the abundance ratio N/O and the ionization parameter U, which are determined by looking for the model fitting [N II]/Hα and [O III]/Hβ. The models are also selected to fit [O II]/Hβ. This process leads to a set of ~3200 models that reproduce the three observations simultaneously. We find that the regions associated with young stellar bursts (i.e., ionized by OB stars) are affected by leaking of ionizing photons,the proportion of escaping photons having a median of 80%. The set of photoionization models satisfactorily reproduces the electron temperature derived from the [O III]λ4363/5007 line ratio. We determine new relations between the nebular parameters, like the ionization parameter U and the [O II]/[O III] or [S II]/[S III] line ratios. A new relation between N/O and O/H is obtained, mostly compatible with previous empirical determinations (and not with previous results obtained using photoionization models). A new relation between U and O/H is also determined. All the models are publicly available on the Mexican Million Models database 3MdB.
Fil: Morisset, C.. Universidad Nacional Autónoma de México; México
Fil: Delgado-Inglada, G.. Universidad Nacional Autónoma de México; México
Fil: Sánchez, S. F.. Universidad Nacional Autónoma de México; México
Fil: Galbany, L.. Millennium Institute Of Astrophysics; Chile. Universidad de Chile; Chile
Fil: Garciá-Benito, R.. Instituto de Astrofísica de Andalucía; España
Fil: Husemann, B.. European Southern Observatory; Alemania
Fil: Marino, R. A.. Universidad Complutense de Madrid; España. Institute for Astronomy; Suiza
Fil: Mast, Damian. Instituto de Astrofísica de Andalucía; España. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
Fil: Roth, M. M.. Astrophysikalisches Institut Potsdam; Alemania
Materia
HII REGIONS
ISM: ABUNDANCES
ISM: GENERAL
LOCAL INSTERSTELLAR MATTER
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/74074

id CONICETDig_2d883b54800cb80c10c270fb0278d09f
oai_identifier_str oai:ri.conicet.gov.ar:11336/74074
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Photoionization models of the CALIFA H II regions: I. Hybrid modelsMorisset, C.Delgado-Inglada, G.Sánchez, S. F.Galbany, L.Garciá-Benito, R.Husemann, B.Marino, R. A.Mast, DamianRoth, M. M.HII REGIONSISM: ABUNDANCESISM: GENERALLOCAL INSTERSTELLAR MATTERhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Photoionization models of H II regions require as input a description of the ionizing spectral energy distribution (SED) and of the gas distribution, in terms of ionization parameter U and chemical abundances (e.g., O/H and N/O).A strong degeneracy exists between the hardness of the SED and U, which in turn leads to high uncertainties in the determination of the other parameters, including abundances. One way to resolve the degeneracy is to fix one of the parameters using additional information. For each of the ~20 000 sources of the CALIFA H II regions catalog, a grid of photoionization models is computed assuming the ionizing SED to be described by the underlying stellar population obtained from spectral synthesis modeling. The ionizing SED is then defined as the sum of various stellar bursts of different ages and metallicities. This solves the degeneracy between the shape of the ionizing SED and U. The nebular metallicity (associated with O/H) is defined using the classical strong line method O3N2 (which gives our models the status of “hybrids”). The remaining free parameters are the abundance ratio N/O and the ionization parameter U, which are determined by looking for the model fitting [N II]/Hα and [O III]/Hβ. The models are also selected to fit [O II]/Hβ. This process leads to a set of ~3200 models that reproduce the three observations simultaneously. We find that the regions associated with young stellar bursts (i.e., ionized by OB stars) are affected by leaking of ionizing photons,the proportion of escaping photons having a median of 80%. The set of photoionization models satisfactorily reproduces the electron temperature derived from the [O III]λ4363/5007 line ratio. We determine new relations between the nebular parameters, like the ionization parameter U and the [O II]/[O III] or [S II]/[S III] line ratios. A new relation between N/O and O/H is obtained, mostly compatible with previous empirical determinations (and not with previous results obtained using photoionization models). A new relation between U and O/H is also determined. All the models are publicly available on the Mexican Million Models database 3MdB.Fil: Morisset, C.. Universidad Nacional Autónoma de México; MéxicoFil: Delgado-Inglada, G.. Universidad Nacional Autónoma de México; MéxicoFil: Sánchez, S. F.. Universidad Nacional Autónoma de México; MéxicoFil: Galbany, L.. Millennium Institute Of Astrophysics; Chile. Universidad de Chile; ChileFil: Garciá-Benito, R.. Instituto de Astrofísica de Andalucía; EspañaFil: Husemann, B.. European Southern Observatory; AlemaniaFil: Marino, R. A.. Universidad Complutense de Madrid; España. Institute for Astronomy; SuizaFil: Mast, Damian. Instituto de Astrofísica de Andalucía; España. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Roth, M. M.. Astrophysikalisches Institut Potsdam; AlemaniaEDP Sciences2016-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/74074Morisset, C.; Delgado-Inglada, G.; Sánchez, S. F.; Galbany, L.; Garciá-Benito, R.; et al.; Photoionization models of the CALIFA H II regions: I. Hybrid models; EDP Sciences; Astronomy and Astrophysics; 594; 6-20160004-63611432-0746CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201628559info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2016/10/aa28559-16/aa28559-16.htmlinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:58:40Zoai:ri.conicet.gov.ar:11336/74074instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:58:41.248CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Photoionization models of the CALIFA H II regions: I. Hybrid models
title Photoionization models of the CALIFA H II regions: I. Hybrid models
spellingShingle Photoionization models of the CALIFA H II regions: I. Hybrid models
Morisset, C.
HII REGIONS
ISM: ABUNDANCES
ISM: GENERAL
LOCAL INSTERSTELLAR MATTER
title_short Photoionization models of the CALIFA H II regions: I. Hybrid models
title_full Photoionization models of the CALIFA H II regions: I. Hybrid models
title_fullStr Photoionization models of the CALIFA H II regions: I. Hybrid models
title_full_unstemmed Photoionization models of the CALIFA H II regions: I. Hybrid models
title_sort Photoionization models of the CALIFA H II regions: I. Hybrid models
dc.creator.none.fl_str_mv Morisset, C.
Delgado-Inglada, G.
Sánchez, S. F.
Galbany, L.
Garciá-Benito, R.
Husemann, B.
Marino, R. A.
Mast, Damian
Roth, M. M.
author Morisset, C.
author_facet Morisset, C.
Delgado-Inglada, G.
Sánchez, S. F.
Galbany, L.
Garciá-Benito, R.
Husemann, B.
Marino, R. A.
Mast, Damian
Roth, M. M.
author_role author
author2 Delgado-Inglada, G.
Sánchez, S. F.
Galbany, L.
Garciá-Benito, R.
Husemann, B.
Marino, R. A.
Mast, Damian
Roth, M. M.
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv HII REGIONS
ISM: ABUNDANCES
ISM: GENERAL
LOCAL INSTERSTELLAR MATTER
topic HII REGIONS
ISM: ABUNDANCES
ISM: GENERAL
LOCAL INSTERSTELLAR MATTER
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Photoionization models of H II regions require as input a description of the ionizing spectral energy distribution (SED) and of the gas distribution, in terms of ionization parameter U and chemical abundances (e.g., O/H and N/O).A strong degeneracy exists between the hardness of the SED and U, which in turn leads to high uncertainties in the determination of the other parameters, including abundances. One way to resolve the degeneracy is to fix one of the parameters using additional information. For each of the ~20 000 sources of the CALIFA H II regions catalog, a grid of photoionization models is computed assuming the ionizing SED to be described by the underlying stellar population obtained from spectral synthesis modeling. The ionizing SED is then defined as the sum of various stellar bursts of different ages and metallicities. This solves the degeneracy between the shape of the ionizing SED and U. The nebular metallicity (associated with O/H) is defined using the classical strong line method O3N2 (which gives our models the status of “hybrids”). The remaining free parameters are the abundance ratio N/O and the ionization parameter U, which are determined by looking for the model fitting [N II]/Hα and [O III]/Hβ. The models are also selected to fit [O II]/Hβ. This process leads to a set of ~3200 models that reproduce the three observations simultaneously. We find that the regions associated with young stellar bursts (i.e., ionized by OB stars) are affected by leaking of ionizing photons,the proportion of escaping photons having a median of 80%. The set of photoionization models satisfactorily reproduces the electron temperature derived from the [O III]λ4363/5007 line ratio. We determine new relations between the nebular parameters, like the ionization parameter U and the [O II]/[O III] or [S II]/[S III] line ratios. A new relation between N/O and O/H is obtained, mostly compatible with previous empirical determinations (and not with previous results obtained using photoionization models). A new relation between U and O/H is also determined. All the models are publicly available on the Mexican Million Models database 3MdB.
Fil: Morisset, C.. Universidad Nacional Autónoma de México; México
Fil: Delgado-Inglada, G.. Universidad Nacional Autónoma de México; México
Fil: Sánchez, S. F.. Universidad Nacional Autónoma de México; México
Fil: Galbany, L.. Millennium Institute Of Astrophysics; Chile. Universidad de Chile; Chile
Fil: Garciá-Benito, R.. Instituto de Astrofísica de Andalucía; España
Fil: Husemann, B.. European Southern Observatory; Alemania
Fil: Marino, R. A.. Universidad Complutense de Madrid; España. Institute for Astronomy; Suiza
Fil: Mast, Damian. Instituto de Astrofísica de Andalucía; España. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
Fil: Roth, M. M.. Astrophysikalisches Institut Potsdam; Alemania
description Photoionization models of H II regions require as input a description of the ionizing spectral energy distribution (SED) and of the gas distribution, in terms of ionization parameter U and chemical abundances (e.g., O/H and N/O).A strong degeneracy exists between the hardness of the SED and U, which in turn leads to high uncertainties in the determination of the other parameters, including abundances. One way to resolve the degeneracy is to fix one of the parameters using additional information. For each of the ~20 000 sources of the CALIFA H II regions catalog, a grid of photoionization models is computed assuming the ionizing SED to be described by the underlying stellar population obtained from spectral synthesis modeling. The ionizing SED is then defined as the sum of various stellar bursts of different ages and metallicities. This solves the degeneracy between the shape of the ionizing SED and U. The nebular metallicity (associated with O/H) is defined using the classical strong line method O3N2 (which gives our models the status of “hybrids”). The remaining free parameters are the abundance ratio N/O and the ionization parameter U, which are determined by looking for the model fitting [N II]/Hα and [O III]/Hβ. The models are also selected to fit [O II]/Hβ. This process leads to a set of ~3200 models that reproduce the three observations simultaneously. We find that the regions associated with young stellar bursts (i.e., ionized by OB stars) are affected by leaking of ionizing photons,the proportion of escaping photons having a median of 80%. The set of photoionization models satisfactorily reproduces the electron temperature derived from the [O III]λ4363/5007 line ratio. We determine new relations between the nebular parameters, like the ionization parameter U and the [O II]/[O III] or [S II]/[S III] line ratios. A new relation between N/O and O/H is obtained, mostly compatible with previous empirical determinations (and not with previous results obtained using photoionization models). A new relation between U and O/H is also determined. All the models are publicly available on the Mexican Million Models database 3MdB.
publishDate 2016
dc.date.none.fl_str_mv 2016-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/74074
Morisset, C.; Delgado-Inglada, G.; Sánchez, S. F.; Galbany, L.; Garciá-Benito, R.; et al.; Photoionization models of the CALIFA H II regions: I. Hybrid models; EDP Sciences; Astronomy and Astrophysics; 594; 6-2016
0004-6361
1432-0746
CONICET Digital
CONICET
url http://hdl.handle.net/11336/74074
identifier_str_mv Morisset, C.; Delgado-Inglada, G.; Sánchez, S. F.; Galbany, L.; Garciá-Benito, R.; et al.; Photoionization models of the CALIFA H II regions: I. Hybrid models; EDP Sciences; Astronomy and Astrophysics; 594; 6-2016
0004-6361
1432-0746
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201628559
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2016/10/aa28559-16/aa28559-16.html
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432