Implications of the kinematical structure of circumnuclear star-forming regions on their derived properties

Autores
Hägele, Guillermo Federico; Díaz, Angeles; Terlevich, Roberto; Terlevich, Elena; Bosch, Guillermo Luis; Cardaci, Monica Viviana
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We review the results of high dispersion spectroscopy of 17 circumnuclear star forming regions (CNSFRs) in 3 nearby early spiral galaxies, NGC 2903, NGC 3310 and NGC 3351.We find that single Gaussian fitting to the Hβ and [Oiii]λ5007 ˚A line profiles results in velocity dispersions around 32 km s−1 and 52 km s−1, respectively, while the IR Caii triplet cross-correlation technique provides stellar velocity dispersion values close to 50 km s−1. Even though multiple kinematical components are present, the relation between gas velocity dispersion and Balmer emission line luminosity (L-σ relation) reproduces the correlation for disk giant Hii regions albeit with a larger scatter. The scatter in the L-σ relation is considerably reduced when theoretical evolutionary corrections are applied suggesting that an age range is present in the sample of CNSFRs. To analyse the observed complex profiles, we performed multiple Gaussian component fits to the Hβ and [Oiii]λ5007 ˚A lines obtaining optimal fits with two Gaussians of different width. These best fits indicate that the narrower component has average velocity dispersion close to 23 km s−1 while the broader component shows average values in the range 50-60 km s−1 for both lines, close to the observed stellar velocity dispersions. The fluxes of the broad and narrow Hβ components are similar. This is not the case for [Oiii]λ5007 ˚A for which the broad components have higher fluxes than the narrow ones, thus producing a clear segregation in their [Oiii]/Hβ ratios. We suggest a possible scenario for understanding the behaviour of CNSFRs in the L-σ and σgas-σ∗ diagrams involving an inner gaseous disk responsible for the narrow component of the emission lines. Our main conclusion is that the presence of different kinematical components with similar total fluxes in the emission line spectrum of CNSFRs raises important doubts regarding properties of the ionized gas derived from global line ratios obtained with low resolution spectroscopy in star-forming regions in the central regions of early type galaxies. Given the ubiquity of these star-forming systems, ionized gas analyses should be done preferably from high dispersion spectra with high spatial resolution.
Fil: Hägele, Guillermo Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Universidad Autónoma de Madrid; España
Fil: Díaz, Angeles. Universidad Autónoma de Madrid. Facultad de Ciencias; España
Fil: Terlevich, Roberto. Instituto Nacional de Astronomía, Óptica y Electrónica; México. University of Cambridge; Reino Unido
Fil: Terlevich, Elena. Instituto Nacional de Astronomía, Óptica y Electrónica; México
Fil: Bosch, Guillermo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Cardaci, Monica Viviana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Universidad Autónoma de Madrid; España
Materia
HII regions
Kinematics (galaxias)
Starbursts
Star clusters
Dynamics (galaxias)
Nivel de accesibilidad
acceso abierto
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https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
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Consejo Nacional de Investigaciones Científicas y Técnicas
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oai:ri.conicet.gov.ar:11336/10966
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/10966
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Implications of the kinematical structure of circumnuclear star-forming regions on their derived propertiesHägele, Guillermo FedericoDíaz, AngelesTerlevich, RobertoTerlevich, ElenaBosch, Guillermo LuisCardaci, Monica VivianaHII regionsKinematics (galaxias)StarburstsStar clustersDynamics (galaxias)https://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We review the results of high dispersion spectroscopy of 17 circumnuclear star forming regions (CNSFRs) in 3 nearby early spiral galaxies, NGC 2903, NGC 3310 and NGC 3351.We find that single Gaussian fitting to the Hβ and [Oiii]λ5007 ˚A line profiles results in velocity dispersions around 32 km s−1 and 52 km s−1, respectively, while the IR Caii triplet cross-correlation technique provides stellar velocity dispersion values close to 50 km s−1. Even though multiple kinematical components are present, the relation between gas velocity dispersion and Balmer emission line luminosity (L-σ relation) reproduces the correlation for disk giant Hii regions albeit with a larger scatter. The scatter in the L-σ relation is considerably reduced when theoretical evolutionary corrections are applied suggesting that an age range is present in the sample of CNSFRs. To analyse the observed complex profiles, we performed multiple Gaussian component fits to the Hβ and [Oiii]λ5007 ˚A lines obtaining optimal fits with two Gaussians of different width. These best fits indicate that the narrower component has average velocity dispersion close to 23 km s−1 while the broader component shows average values in the range 50-60 km s−1 for both lines, close to the observed stellar velocity dispersions. The fluxes of the broad and narrow Hβ components are similar. This is not the case for [Oiii]λ5007 ˚A for which the broad components have higher fluxes than the narrow ones, thus producing a clear segregation in their [Oiii]/Hβ ratios. We suggest a possible scenario for understanding the behaviour of CNSFRs in the L-σ and σgas-σ∗ diagrams involving an inner gaseous disk responsible for the narrow component of the emission lines. Our main conclusion is that the presence of different kinematical components with similar total fluxes in the emission line spectrum of CNSFRs raises important doubts regarding properties of the ionized gas derived from global line ratios obtained with low resolution spectroscopy in star-forming regions in the central regions of early type galaxies. Given the ubiquity of these star-forming systems, ionized gas analyses should be done preferably from high dispersion spectra with high spatial resolution.Fil: Hägele, Guillermo Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Universidad Autónoma de Madrid; EspañaFil: Díaz, Angeles. Universidad Autónoma de Madrid. Facultad de Ciencias; EspañaFil: Terlevich, Roberto. Instituto Nacional de Astronomía, Óptica y Electrónica; México. University of Cambridge; Reino UnidoFil: Terlevich, Elena. Instituto Nacional de Astronomía, Óptica y Electrónica; MéxicoFil: Bosch, Guillermo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaFil: Cardaci, Monica Viviana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Universidad Autónoma de Madrid; EspañaOxford University Press2013-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/10966Hägele, Guillermo Federico; Díaz, Angeles; Terlevich, Roberto; Terlevich, Elena; Bosch, Guillermo Luis; et al.; Implications of the kinematical structure of circumnuclear star-forming regions on their derived properties; Oxford University Press; Monthly Notices Of The Royal Astronomical Society; 432; 1; 5-2013; 810-8210035-8711enginfo:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stt491info:eu-repo/semantics/altIdentifier/url/http://mnras.oxfordjournals.org/content/432/1/810info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:09:10Zoai:ri.conicet.gov.ar:11336/10966instacron: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:34982025-09-10 13:09:10.594CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Implications of the kinematical structure of circumnuclear star-forming regions on their derived properties
title Implications of the kinematical structure of circumnuclear star-forming regions on their derived properties
spellingShingle Implications of the kinematical structure of circumnuclear star-forming regions on their derived properties
Hägele, Guillermo Federico
HII regions
Kinematics (galaxias)
Starbursts
Star clusters
Dynamics (galaxias)
title_short Implications of the kinematical structure of circumnuclear star-forming regions on their derived properties
title_full Implications of the kinematical structure of circumnuclear star-forming regions on their derived properties
title_fullStr Implications of the kinematical structure of circumnuclear star-forming regions on their derived properties
title_full_unstemmed Implications of the kinematical structure of circumnuclear star-forming regions on their derived properties
title_sort Implications of the kinematical structure of circumnuclear star-forming regions on their derived properties
dc.creator.none.fl_str_mv Hägele, Guillermo Federico
Díaz, Angeles
Terlevich, Roberto
Terlevich, Elena
Bosch, Guillermo Luis
Cardaci, Monica Viviana
author Hägele, Guillermo Federico
author_facet Hägele, Guillermo Federico
Díaz, Angeles
Terlevich, Roberto
Terlevich, Elena
Bosch, Guillermo Luis
Cardaci, Monica Viviana
author_role author
author2 Díaz, Angeles
Terlevich, Roberto
Terlevich, Elena
Bosch, Guillermo Luis
Cardaci, Monica Viviana
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv HII regions
Kinematics (galaxias)
Starbursts
Star clusters
Dynamics (galaxias)
topic HII regions
Kinematics (galaxias)
Starbursts
Star clusters
Dynamics (galaxias)
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We review the results of high dispersion spectroscopy of 17 circumnuclear star forming regions (CNSFRs) in 3 nearby early spiral galaxies, NGC 2903, NGC 3310 and NGC 3351.We find that single Gaussian fitting to the Hβ and [Oiii]λ5007 ˚A line profiles results in velocity dispersions around 32 km s−1 and 52 km s−1, respectively, while the IR Caii triplet cross-correlation technique provides stellar velocity dispersion values close to 50 km s−1. Even though multiple kinematical components are present, the relation between gas velocity dispersion and Balmer emission line luminosity (L-σ relation) reproduces the correlation for disk giant Hii regions albeit with a larger scatter. The scatter in the L-σ relation is considerably reduced when theoretical evolutionary corrections are applied suggesting that an age range is present in the sample of CNSFRs. To analyse the observed complex profiles, we performed multiple Gaussian component fits to the Hβ and [Oiii]λ5007 ˚A lines obtaining optimal fits with two Gaussians of different width. These best fits indicate that the narrower component has average velocity dispersion close to 23 km s−1 while the broader component shows average values in the range 50-60 km s−1 for both lines, close to the observed stellar velocity dispersions. The fluxes of the broad and narrow Hβ components are similar. This is not the case for [Oiii]λ5007 ˚A for which the broad components have higher fluxes than the narrow ones, thus producing a clear segregation in their [Oiii]/Hβ ratios. We suggest a possible scenario for understanding the behaviour of CNSFRs in the L-σ and σgas-σ∗ diagrams involving an inner gaseous disk responsible for the narrow component of the emission lines. Our main conclusion is that the presence of different kinematical components with similar total fluxes in the emission line spectrum of CNSFRs raises important doubts regarding properties of the ionized gas derived from global line ratios obtained with low resolution spectroscopy in star-forming regions in the central regions of early type galaxies. Given the ubiquity of these star-forming systems, ionized gas analyses should be done preferably from high dispersion spectra with high spatial resolution.
Fil: Hägele, Guillermo Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Universidad Autónoma de Madrid; España
Fil: Díaz, Angeles. Universidad Autónoma de Madrid. Facultad de Ciencias; España
Fil: Terlevich, Roberto. Instituto Nacional de Astronomía, Óptica y Electrónica; México. University of Cambridge; Reino Unido
Fil: Terlevich, Elena. Instituto Nacional de Astronomía, Óptica y Electrónica; México
Fil: Bosch, Guillermo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Cardaci, Monica Viviana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Universidad Autónoma de Madrid; España
description We review the results of high dispersion spectroscopy of 17 circumnuclear star forming regions (CNSFRs) in 3 nearby early spiral galaxies, NGC 2903, NGC 3310 and NGC 3351.We find that single Gaussian fitting to the Hβ and [Oiii]λ5007 ˚A line profiles results in velocity dispersions around 32 km s−1 and 52 km s−1, respectively, while the IR Caii triplet cross-correlation technique provides stellar velocity dispersion values close to 50 km s−1. Even though multiple kinematical components are present, the relation between gas velocity dispersion and Balmer emission line luminosity (L-σ relation) reproduces the correlation for disk giant Hii regions albeit with a larger scatter. The scatter in the L-σ relation is considerably reduced when theoretical evolutionary corrections are applied suggesting that an age range is present in the sample of CNSFRs. To analyse the observed complex profiles, we performed multiple Gaussian component fits to the Hβ and [Oiii]λ5007 ˚A lines obtaining optimal fits with two Gaussians of different width. These best fits indicate that the narrower component has average velocity dispersion close to 23 km s−1 while the broader component shows average values in the range 50-60 km s−1 for both lines, close to the observed stellar velocity dispersions. The fluxes of the broad and narrow Hβ components are similar. This is not the case for [Oiii]λ5007 ˚A for which the broad components have higher fluxes than the narrow ones, thus producing a clear segregation in their [Oiii]/Hβ ratios. We suggest a possible scenario for understanding the behaviour of CNSFRs in the L-σ and σgas-σ∗ diagrams involving an inner gaseous disk responsible for the narrow component of the emission lines. Our main conclusion is that the presence of different kinematical components with similar total fluxes in the emission line spectrum of CNSFRs raises important doubts regarding properties of the ionized gas derived from global line ratios obtained with low resolution spectroscopy in star-forming regions in the central regions of early type galaxies. Given the ubiquity of these star-forming systems, ionized gas analyses should be done preferably from high dispersion spectra with high spatial resolution.
publishDate 2013
dc.date.none.fl_str_mv 2013-05
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/11336/10966
Hägele, Guillermo Federico; Díaz, Angeles; Terlevich, Roberto; Terlevich, Elena; Bosch, Guillermo Luis; et al.; Implications of the kinematical structure of circumnuclear star-forming regions on their derived properties; Oxford University Press; Monthly Notices Of The Royal Astronomical Society; 432; 1; 5-2013; 810-821
0035-8711
url http://hdl.handle.net/11336/10966
identifier_str_mv Hägele, Guillermo Federico; Díaz, Angeles; Terlevich, Roberto; Terlevich, Elena; Bosch, Guillermo Luis; et al.; Implications of the kinematical structure of circumnuclear star-forming regions on their derived properties; Oxford University Press; Monthly Notices Of The Royal Astronomical Society; 432; 1; 5-2013; 810-821
0035-8711
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stt491
info:eu-repo/semantics/altIdentifier/url/http://mnras.oxfordjournals.org/content/432/1/810
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
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
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 13.004268

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