Local luminous infrared galaxies. I. Spatially resolved observations with the Spitzer infrared spectrograph
We present results from the Spitzer Infrared Spectrograph spectral mapping observations of 15 local luminous infrared galaxies (LIRGs). In this paper, we investigate the spatial variations of the mid-IR emission which includes fine structure lines, molecular hydrogen lines, polycyclic aromatic featu...
| Autores: | , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2010 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/45111 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/45111 |
| Access Level: | acceso abierto |
| Palabra clave: | 52 Star-forming regions Polycyclic aromatic-hydrocarbon High-resolution spectroscopy Integral field spectroscopy Emission-line diagnostics Warm molecular-hydrogen Fine-structure lines Starburst galaxies Midinfrared spectroscopy Space-telescope Astrofísica Astronomía (Física) |
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Local luminous infrared galaxies. I. Spatially resolved observations with the Spitzer infrared spectrographPereira Santaella, MiguelAlonso Herrero, AlmudenaRieke, George H.Colina, LuisDíaz Santos, TanioSmith, J. D. T.Pérez González, Pablo GuillermoEngelbracht, Charles W.52Star-forming regionsPolycyclic aromatic-hydrocarbonHigh-resolution spectroscopyIntegral field spectroscopyEmission-line diagnosticsWarm molecular-hydrogenFine-structure linesStarburst galaxiesMidinfrared spectroscopySpace-telescopeAstrofísicaAstronomía (Física)We present results from the Spitzer Infrared Spectrograph spectral mapping observations of 15 local luminous infrared galaxies (LIRGs). In this paper, we investigate the spatial variations of the mid-IR emission which includes fine structure lines, molecular hydrogen lines, polycyclic aromatic features (PAHs), continuum emission, and the 9.7 μm silicate feature. We also compare the nuclear and integrated spectra. We find that the star formation takes place in extended regions (several kpc) as probed by the PAH emission, as well as the [Ne II]12.81 μm and [Ne III]15.56 μm emissions. The behavior of the integrated PAH emission and 9.7 μm silicate feature is similar to that of local starburst galaxies. We also find that the minima of the [Ne III]15.56 μm/[Ne II]12.81 μm ratio tends to be located at the nuclei and its value is lower than that of H II regions in our LIRGs and nearby galaxies. It is likely that increased densities in the nuclei of LIRGs are responsible for the smaller nuclear [Ne III]15.56 μm/[Ne II]12.81 μm ratios. This includes the possibility that some of the most massive stars in the nuclei are still embedded in ultracompact H II regions. In a large fraction of our sample, the 11.3 μm PAH emission appears more extended than the dust 5.5 μm continuum emission. We find a dependency of the 11.3 μm PAH/7.7 μm PAH and [Ne II]12.81 μm/11.3 μm PAH ratios with the age of the stellar populations. Smaller and larger ratios, respectively, indicate recent star formation. The estimated warm (300 K <T< 1000 K) molecular hydrogen masses are of the order of 10^8 M_☉, which are similar to those found in ULIRGs, local starbursts, and Seyfert galaxies. Finally we find that the [Ne II]12.81 μm velocity fields for most of the LIRGs in our sample are compatible with a rotating disk at ~kpc scales, and they are in a good agreement with Hα velocity fields.University Chicago PressUniversidad Complutense de Madrid20102010-06-0120102010-06-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/45111reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/451112026-06-02T12:44:21Z |
| dc.title.none.fl_str_mv |
Local luminous infrared galaxies. I. Spatially resolved observations with the Spitzer infrared spectrograph |
| title |
Local luminous infrared galaxies. I. Spatially resolved observations with the Spitzer infrared spectrograph |
| spellingShingle |
Local luminous infrared galaxies. I. Spatially resolved observations with the Spitzer infrared spectrograph Pereira Santaella, Miguel 52 Star-forming regions Polycyclic aromatic-hydrocarbon High-resolution spectroscopy Integral field spectroscopy Emission-line diagnostics Warm molecular-hydrogen Fine-structure lines Starburst galaxies Midinfrared spectroscopy Space-telescope Astrofísica Astronomía (Física) |
| title_short |
Local luminous infrared galaxies. I. Spatially resolved observations with the Spitzer infrared spectrograph |
| title_full |
Local luminous infrared galaxies. I. Spatially resolved observations with the Spitzer infrared spectrograph |
| title_fullStr |
Local luminous infrared galaxies. I. Spatially resolved observations with the Spitzer infrared spectrograph |
| title_full_unstemmed |
Local luminous infrared galaxies. I. Spatially resolved observations with the Spitzer infrared spectrograph |
| title_sort |
Local luminous infrared galaxies. I. Spatially resolved observations with the Spitzer infrared spectrograph |
| dc.creator.none.fl_str_mv |
Pereira Santaella, Miguel Alonso Herrero, Almudena Rieke, George H. Colina, Luis Díaz Santos, Tanio Smith, J. D. T. Pérez González, Pablo Guillermo Engelbracht, Charles W. |
| author |
Pereira Santaella, Miguel |
| author_facet |
Pereira Santaella, Miguel Alonso Herrero, Almudena Rieke, George H. Colina, Luis Díaz Santos, Tanio Smith, J. D. T. Pérez González, Pablo Guillermo Engelbracht, Charles W. |
| author_role |
author |
| author2 |
Alonso Herrero, Almudena Rieke, George H. Colina, Luis Díaz Santos, Tanio Smith, J. D. T. Pérez González, Pablo Guillermo Engelbracht, Charles W. |
| author2_role |
author author author author author author author |
| dc.contributor.none.fl_str_mv |
Universidad Complutense de Madrid |
| dc.subject.none.fl_str_mv |
52 Star-forming regions Polycyclic aromatic-hydrocarbon High-resolution spectroscopy Integral field spectroscopy Emission-line diagnostics Warm molecular-hydrogen Fine-structure lines Starburst galaxies Midinfrared spectroscopy Space-telescope Astrofísica Astronomía (Física) |
| topic |
52 Star-forming regions Polycyclic aromatic-hydrocarbon High-resolution spectroscopy Integral field spectroscopy Emission-line diagnostics Warm molecular-hydrogen Fine-structure lines Starburst galaxies Midinfrared spectroscopy Space-telescope Astrofísica Astronomía (Física) |
| description |
We present results from the Spitzer Infrared Spectrograph spectral mapping observations of 15 local luminous infrared galaxies (LIRGs). In this paper, we investigate the spatial variations of the mid-IR emission which includes fine structure lines, molecular hydrogen lines, polycyclic aromatic features (PAHs), continuum emission, and the 9.7 μm silicate feature. We also compare the nuclear and integrated spectra. We find that the star formation takes place in extended regions (several kpc) as probed by the PAH emission, as well as the [Ne II]12.81 μm and [Ne III]15.56 μm emissions. The behavior of the integrated PAH emission and 9.7 μm silicate feature is similar to that of local starburst galaxies. We also find that the minima of the [Ne III]15.56 μm/[Ne II]12.81 μm ratio tends to be located at the nuclei and its value is lower than that of H II regions in our LIRGs and nearby galaxies. It is likely that increased densities in the nuclei of LIRGs are responsible for the smaller nuclear [Ne III]15.56 μm/[Ne II]12.81 μm ratios. This includes the possibility that some of the most massive stars in the nuclei are still embedded in ultracompact H II regions. In a large fraction of our sample, the 11.3 μm PAH emission appears more extended than the dust 5.5 μm continuum emission. We find a dependency of the 11.3 μm PAH/7.7 μm PAH and [Ne II]12.81 μm/11.3 μm PAH ratios with the age of the stellar populations. Smaller and larger ratios, respectively, indicate recent star formation. The estimated warm (300 K <T< 1000 K) molecular hydrogen masses are of the order of 10^8 M_☉, which are similar to those found in ULIRGs, local starbursts, and Seyfert galaxies. Finally we find that the [Ne II]12.81 μm velocity fields for most of the LIRGs in our sample are compatible with a rotating disk at ~kpc scales, and they are in a good agreement with Hα velocity fields. |
| publishDate |
2010 |
| dc.date.none.fl_str_mv |
2010 2010-06-01 2010 2010-06-01 |
| 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/20.500.14352/45111 |
| url |
https://hdl.handle.net/20.500.14352/45111 |
| 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 |
University Chicago Press |
| publisher.none.fl_str_mv |
University Chicago Press |
| 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 |
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| repository.mail.fl_str_mv |
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1869406482712231936 |
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15.301603 |