Study of the molecular and ionized gas in a possible precursor of an ultra-compact HII region
- Autores
- Ortega, Martin Eduardo; Paron, Sergio Ariel; Giacani, Elsa Beatriz; Celis Peña, Mariela Fernanda; Rubio, M.; Petriella, Alberto
- Año de publicación
- 2017
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Aims. We study the molecular and the ionized gas in a possible precursor of an ultra-compact H ii region to contribute to the understanding of how high-mass stars build-up their masses once they have reached the zero-age main secuence. Methods. We carried out molecular observations towards the position of the Red MSX source G052.9221−00.4892, using the Atacama Submillimeter Telescope Experiment (ASTE; Chile) in the 12CO J=3−2, 13CO J=3−2, C18O J=3−2, and HCO+ J=4−3 lines with an angular resolution of about 22′′. We also present radio continuum observations at 6 GHz carried out with the Jansky Very Large Array (JVLA; USA) interferometer with a synthesized beam of 4 ′′.8× 4′′.1. The molecular data were used to study the distribution and kinematics of the molecular gas, while the radio continuum data were used to characterize the ionized gas in the region. Combining these observations with public infrared data allowed us to inquire about the nature of the source. Results. The analysis of the molecular observations reveals the presence of a kinetic temperature and H2 column density gradients across the molecular clump in which the Red MSX source G052.9221−00.4892 is embedded, with the hotter and less dense gas in the inner region. The 12CO J=3−2 emission shows evidence of misaligned massive molecular outflows, with the blue lobe in positional coincidence with a jet-like feature seen at 8 µm. The radio continuum emission shows a slightly elongated compact radio source, with a flux density of about 0.9 mJy, in positional coincidence with the Red MSX source. The polar-like morphology of this compact radio source perfectly matches the hourglass-like morphology exhibited by the source in the Ks−band. Moreover, the axes of symmetry of the radio source and the near-infrared nebula are perfectly aligned. Thus, based on the presence of molecular outflows, the slightly elongated morphology of the compact radio source matching the hourglass-like morphology of the source at the Ks−band, and the lack of evidence of collimated jets in the near-infrared spectrum, one interpretation for the nature of the source, is that the Red MSX source G052.9221−00.4892 could be transiting a hyper-compact H ii region phase, in which the young central star emits winds and ionizing radiation through the poles. By the other hand, according to a comparison between the Brγ intensity and the radio flux density at 6 GHz, the source would be in a more evolved evolutionary stage of an optically thin UC H ii region in photoionization equilibrium. If this is the case, from the radio continuum emission, we can conjecture upon the spectral type of its exciting star which would be a B0.5V.
Fil: Ortega, Martin Eduardo. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Paron, Sergio Ariel. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Giacani, Elsa Beatriz. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Celis Peña, Mariela Fernanda. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Rubio, M.. Universidad de Chile; Chile
Fil: Petriella, Alberto. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina - Materia
-
ISM: CLOUDS
STARS: FORMATION
STARS: WINDS, OUTFLOWS - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
.jpg)
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/26705
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Study of the molecular and ionized gas in a possible precursor of an ultra-compact HII regionOrtega, Martin EduardoParon, Sergio ArielGiacani, Elsa BeatrizCelis Peña, Mariela FernandaRubio, M.Petriella, AlbertoISM: CLOUDSSTARS: FORMATIONSTARS: WINDS, OUTFLOWShttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Aims. We study the molecular and the ionized gas in a possible precursor of an ultra-compact H ii region to contribute to the understanding of how high-mass stars build-up their masses once they have reached the zero-age main secuence. Methods. We carried out molecular observations towards the position of the Red MSX source G052.9221−00.4892, using the Atacama Submillimeter Telescope Experiment (ASTE; Chile) in the 12CO J=3−2, 13CO J=3−2, C18O J=3−2, and HCO+ J=4−3 lines with an angular resolution of about 22′′. We also present radio continuum observations at 6 GHz carried out with the Jansky Very Large Array (JVLA; USA) interferometer with a synthesized beam of 4 ′′.8× 4′′.1. The molecular data were used to study the distribution and kinematics of the molecular gas, while the radio continuum data were used to characterize the ionized gas in the region. Combining these observations with public infrared data allowed us to inquire about the nature of the source. Results. The analysis of the molecular observations reveals the presence of a kinetic temperature and H2 column density gradients across the molecular clump in which the Red MSX source G052.9221−00.4892 is embedded, with the hotter and less dense gas in the inner region. The 12CO J=3−2 emission shows evidence of misaligned massive molecular outflows, with the blue lobe in positional coincidence with a jet-like feature seen at 8 µm. The radio continuum emission shows a slightly elongated compact radio source, with a flux density of about 0.9 mJy, in positional coincidence with the Red MSX source. The polar-like morphology of this compact radio source perfectly matches the hourglass-like morphology exhibited by the source in the Ks−band. Moreover, the axes of symmetry of the radio source and the near-infrared nebula are perfectly aligned. Thus, based on the presence of molecular outflows, the slightly elongated morphology of the compact radio source matching the hourglass-like morphology of the source at the Ks−band, and the lack of evidence of collimated jets in the near-infrared spectrum, one interpretation for the nature of the source, is that the Red MSX source G052.9221−00.4892 could be transiting a hyper-compact H ii region phase, in which the young central star emits winds and ionizing radiation through the poles. By the other hand, according to a comparison between the Brγ intensity and the radio flux density at 6 GHz, the source would be in a more evolved evolutionary stage of an optically thin UC H ii region in photoionization equilibrium. If this is the case, from the radio continuum emission, we can conjecture upon the spectral type of its exciting star which would be a B0.5V.Fil: Ortega, Martin Eduardo. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Paron, Sergio Ariel. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Giacani, Elsa Beatriz. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Celis Peña, Mariela Fernanda. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Rubio, M.. Universidad de Chile; ChileFil: Petriella, Alberto. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaEDP Sciences2017-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/26705Ortega, Martin Eduardo; Paron, Sergio Ariel; Giacani, Elsa Beatriz; Celis Peña, Mariela Fernanda; Rubio, M.; et al.; Study of the molecular and ionized gas in a possible precursor of an ultra-compact HII region; EDP Sciences; Astronomy and Astrophysics; 606; A61; 8-2017; 1-70004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201730879info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2017/10/aa30879-17/aa30879-17.htmlinfo:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1708.06591info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:59:34Zoai:ri.conicet.gov.ar:11336/26705instacron: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:34982025-10-22 11:59:34.49CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
| dc.title.none.fl_str_mv |
Study of the molecular and ionized gas in a possible precursor of an ultra-compact HII region |
| title |
Study of the molecular and ionized gas in a possible precursor of an ultra-compact HII region |
| spellingShingle |
Study of the molecular and ionized gas in a possible precursor of an ultra-compact HII region Ortega, Martin Eduardo ISM: CLOUDS STARS: FORMATION STARS: WINDS, OUTFLOWS |
| title_short |
Study of the molecular and ionized gas in a possible precursor of an ultra-compact HII region |
| title_full |
Study of the molecular and ionized gas in a possible precursor of an ultra-compact HII region |
| title_fullStr |
Study of the molecular and ionized gas in a possible precursor of an ultra-compact HII region |
| title_full_unstemmed |
Study of the molecular and ionized gas in a possible precursor of an ultra-compact HII region |
| title_sort |
Study of the molecular and ionized gas in a possible precursor of an ultra-compact HII region |
| dc.creator.none.fl_str_mv |
Ortega, Martin Eduardo Paron, Sergio Ariel Giacani, Elsa Beatriz Celis Peña, Mariela Fernanda Rubio, M. Petriella, Alberto |
| author |
Ortega, Martin Eduardo |
| author_facet |
Ortega, Martin Eduardo Paron, Sergio Ariel Giacani, Elsa Beatriz Celis Peña, Mariela Fernanda Rubio, M. Petriella, Alberto |
| author_role |
author |
| author2 |
Paron, Sergio Ariel Giacani, Elsa Beatriz Celis Peña, Mariela Fernanda Rubio, M. Petriella, Alberto |
| author2_role |
author author author author author |
| dc.subject.none.fl_str_mv |
ISM: CLOUDS STARS: FORMATION STARS: WINDS, OUTFLOWS |
| topic |
ISM: CLOUDS STARS: FORMATION STARS: WINDS, OUTFLOWS |
| purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| dc.description.none.fl_txt_mv |
Aims. We study the molecular and the ionized gas in a possible precursor of an ultra-compact H ii region to contribute to the understanding of how high-mass stars build-up their masses once they have reached the zero-age main secuence. Methods. We carried out molecular observations towards the position of the Red MSX source G052.9221−00.4892, using the Atacama Submillimeter Telescope Experiment (ASTE; Chile) in the 12CO J=3−2, 13CO J=3−2, C18O J=3−2, and HCO+ J=4−3 lines with an angular resolution of about 22′′. We also present radio continuum observations at 6 GHz carried out with the Jansky Very Large Array (JVLA; USA) interferometer with a synthesized beam of 4 ′′.8× 4′′.1. The molecular data were used to study the distribution and kinematics of the molecular gas, while the radio continuum data were used to characterize the ionized gas in the region. Combining these observations with public infrared data allowed us to inquire about the nature of the source. Results. The analysis of the molecular observations reveals the presence of a kinetic temperature and H2 column density gradients across the molecular clump in which the Red MSX source G052.9221−00.4892 is embedded, with the hotter and less dense gas in the inner region. The 12CO J=3−2 emission shows evidence of misaligned massive molecular outflows, with the blue lobe in positional coincidence with a jet-like feature seen at 8 µm. The radio continuum emission shows a slightly elongated compact radio source, with a flux density of about 0.9 mJy, in positional coincidence with the Red MSX source. The polar-like morphology of this compact radio source perfectly matches the hourglass-like morphology exhibited by the source in the Ks−band. Moreover, the axes of symmetry of the radio source and the near-infrared nebula are perfectly aligned. Thus, based on the presence of molecular outflows, the slightly elongated morphology of the compact radio source matching the hourglass-like morphology of the source at the Ks−band, and the lack of evidence of collimated jets in the near-infrared spectrum, one interpretation for the nature of the source, is that the Red MSX source G052.9221−00.4892 could be transiting a hyper-compact H ii region phase, in which the young central star emits winds and ionizing radiation through the poles. By the other hand, according to a comparison between the Brγ intensity and the radio flux density at 6 GHz, the source would be in a more evolved evolutionary stage of an optically thin UC H ii region in photoionization equilibrium. If this is the case, from the radio continuum emission, we can conjecture upon the spectral type of its exciting star which would be a B0.5V. Fil: Ortega, Martin Eduardo. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina Fil: Paron, Sergio Ariel. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina Fil: Giacani, Elsa Beatriz. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina Fil: Celis Peña, Mariela Fernanda. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina Fil: Rubio, M.. Universidad de Chile; Chile Fil: Petriella, Alberto. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina |
| description |
Aims. We study the molecular and the ionized gas in a possible precursor of an ultra-compact H ii region to contribute to the understanding of how high-mass stars build-up their masses once they have reached the zero-age main secuence. Methods. We carried out molecular observations towards the position of the Red MSX source G052.9221−00.4892, using the Atacama Submillimeter Telescope Experiment (ASTE; Chile) in the 12CO J=3−2, 13CO J=3−2, C18O J=3−2, and HCO+ J=4−3 lines with an angular resolution of about 22′′. We also present radio continuum observations at 6 GHz carried out with the Jansky Very Large Array (JVLA; USA) interferometer with a synthesized beam of 4 ′′.8× 4′′.1. The molecular data were used to study the distribution and kinematics of the molecular gas, while the radio continuum data were used to characterize the ionized gas in the region. Combining these observations with public infrared data allowed us to inquire about the nature of the source. Results. The analysis of the molecular observations reveals the presence of a kinetic temperature and H2 column density gradients across the molecular clump in which the Red MSX source G052.9221−00.4892 is embedded, with the hotter and less dense gas in the inner region. The 12CO J=3−2 emission shows evidence of misaligned massive molecular outflows, with the blue lobe in positional coincidence with a jet-like feature seen at 8 µm. The radio continuum emission shows a slightly elongated compact radio source, with a flux density of about 0.9 mJy, in positional coincidence with the Red MSX source. The polar-like morphology of this compact radio source perfectly matches the hourglass-like morphology exhibited by the source in the Ks−band. Moreover, the axes of symmetry of the radio source and the near-infrared nebula are perfectly aligned. Thus, based on the presence of molecular outflows, the slightly elongated morphology of the compact radio source matching the hourglass-like morphology of the source at the Ks−band, and the lack of evidence of collimated jets in the near-infrared spectrum, one interpretation for the nature of the source, is that the Red MSX source G052.9221−00.4892 could be transiting a hyper-compact H ii region phase, in which the young central star emits winds and ionizing radiation through the poles. By the other hand, according to a comparison between the Brγ intensity and the radio flux density at 6 GHz, the source would be in a more evolved evolutionary stage of an optically thin UC H ii region in photoionization equilibrium. If this is the case, from the radio continuum emission, we can conjecture upon the spectral type of its exciting star which would be a B0.5V. |
| publishDate |
2017 |
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2017-08 |
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info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
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article |
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publishedVersion |
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http://hdl.handle.net/11336/26705 Ortega, Martin Eduardo; Paron, Sergio Ariel; Giacani, Elsa Beatriz; Celis Peña, Mariela Fernanda; Rubio, M.; et al.; Study of the molecular and ionized gas in a possible precursor of an ultra-compact HII region; EDP Sciences; Astronomy and Astrophysics; 606; A61; 8-2017; 1-7 0004-6361 CONICET Digital CONICET |
| url |
http://hdl.handle.net/11336/26705 |
| identifier_str_mv |
Ortega, Martin Eduardo; Paron, Sergio Ariel; Giacani, Elsa Beatriz; Celis Peña, Mariela Fernanda; Rubio, M.; et al.; Study of the molecular and ionized gas in a possible precursor of an ultra-compact HII region; EDP Sciences; Astronomy and Astrophysics; 606; A61; 8-2017; 1-7 0004-6361 CONICET Digital CONICET |
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eng |
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eng |
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info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201730879 info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2017/10/aa30879-17/aa30879-17.html info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1708.06591 |
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info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
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openAccess |
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