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
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/26705

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network_name_str CONICET Digital (CONICET)
spelling 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 Técnicas2025-09-29T10:26:59Zoai: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:34982025-09-29 10:26:59.487CONICET 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
dc.date.none.fl_str_mv 2017-08
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/11336/26705
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
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201730879
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
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)
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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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