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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/74074
Ver los metadatos del registro completo
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oai:ri.conicet.gov.ar:11336/74074 |
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3498 |
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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 |
_version_ |
1844613747488849920 |
score |
13.070432 |