A Spectral Survey of CH3CCH in the Hot Molecular Core G331.512-0.103

Autores
Santos, Julia; Bronfman, Leonardo; Mendoza, Edgar; Lépine, Jacques R. D.; Duronea, Nicolas Urbano; Merello, Manuel; Finger, Ricardo
Año de publicación
2022
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
A spectral survey of methyl acetylene (CH3CCH) was conducted toward the hot molecular core/outflow G331.512-0.103. Our APEX observations allowed the detection of 41 uncontaminated rotational lines of CH3CCH in the frequency range between 172 and 356 GHz. Through an analysis under the local thermodynamic equilibrium assumption, by means of rotational diagrams, we determined T exc = 50 ? 1 K, N(CH3CCH) = (7.5 ? 0.4) ? 1015 cm2, X[CH3CCH/H2] ≈ (0.8-2.8) ? 10-8, and X[CH3CCH/CH3OH] ≈ 0.42 ? 0.05 for an extended emitting region (∼10″). The relative intensities of the K = 2 and K = 3 lines within a given K-ladder are strongly negatively correlated to the transitions' upper J quantum number (r = -0.84). Pure rotational spectra of CH3CCH were simulated at different temperatures, in order to interpret this observation. The results indicate that the emission is characterized by a nonnegligible temperature gradient with upper and lower limits of ∼45 and ∼60 K, respectively. Moreover, the line widths and peak velocities show an overall strong correlation with their rest frequencies, suggesting that the warmer gas is also associated with stronger turbulence effects. The K = 0 transitions present a slightly different kinematic signature than the remaining lines, indicating that they might be tracing a different gas component. We speculate that this component is characterized by lower temperatures and therefore larger sizes. Moreover, we predict and discuss the temporal evolution of the CH3CCH abundance using a two-stage zero-dimensional model of the source constructed with the three-phase Nautilus gas-grain code.
Fil: Santos, Julia. Universidade de Sao Paulo; Brasil
Fil: Bronfman, Leonardo. Universidad de Chile. Facultad de Ciencias Físicas y Matemáticas; Chile
Fil: Mendoza, Edgar. Universidade de Sao Paulo; Brasil. Universidade Federal do Rio de Janeiro; Brasil
Fil: Lépine, Jacques R. D.. Universidade de Sao Paulo; Brasil
Fil: Duronea, Nicolas Urbano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Merello, Manuel. Universidad de Chile; Chile
Fil: Finger, Ricardo. Universidad de Chile; Chile
Materia
Methyl acetylene
Molecular outflows
Hot Molecular Cores
Astrochemistry
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:11336/210900
Acceder
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network_acronym_str CONICETDig
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network_name_str CONICET Digital (CONICET)
spelling A Spectral Survey of CH3CCH in the Hot Molecular Core G331.512-0.103Santos, JuliaBronfman, LeonardoMendoza, EdgarLépine, Jacques R. D.Duronea, Nicolas UrbanoMerello, ManuelFinger, RicardoMethyl acetyleneMolecular outflowsHot Molecular CoresAstrochemistryhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1A spectral survey of methyl acetylene (CH3CCH) was conducted toward the hot molecular core/outflow G331.512-0.103. Our APEX observations allowed the detection of 41 uncontaminated rotational lines of CH3CCH in the frequency range between 172 and 356 GHz. Through an analysis under the local thermodynamic equilibrium assumption, by means of rotational diagrams, we determined T exc = 50 ? 1 K, N(CH3CCH) = (7.5 ? 0.4) ? 1015 cm2, X[CH3CCH/H2] ≈ (0.8-2.8) ? 10-8, and X[CH3CCH/CH3OH] ≈ 0.42 ? 0.05 for an extended emitting region (∼10″). The relative intensities of the K = 2 and K = 3 lines within a given K-ladder are strongly negatively correlated to the transitions' upper J quantum number (r = -0.84). Pure rotational spectra of CH3CCH were simulated at different temperatures, in order to interpret this observation. The results indicate that the emission is characterized by a nonnegligible temperature gradient with upper and lower limits of ∼45 and ∼60 K, respectively. Moreover, the line widths and peak velocities show an overall strong correlation with their rest frequencies, suggesting that the warmer gas is also associated with stronger turbulence effects. The K = 0 transitions present a slightly different kinematic signature than the remaining lines, indicating that they might be tracing a different gas component. We speculate that this component is characterized by lower temperatures and therefore larger sizes. Moreover, we predict and discuss the temporal evolution of the CH3CCH abundance using a two-stage zero-dimensional model of the source constructed with the three-phase Nautilus gas-grain code.Fil: Santos, Julia. Universidade de Sao Paulo; BrasilFil: Bronfman, Leonardo. Universidad de Chile. Facultad de Ciencias Físicas y Matemáticas; ChileFil: Mendoza, Edgar. Universidade de Sao Paulo; Brasil. Universidade Federal do Rio de Janeiro; BrasilFil: Lépine, Jacques R. D.. Universidade de Sao Paulo; BrasilFil: Duronea, Nicolas Urbano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Merello, Manuel. Universidad de Chile; ChileFil: Finger, Ricardo. Universidad de Chile; ChileIOP Publishing2022-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/210900Santos, Julia; Bronfman, Leonardo; Mendoza, Edgar; Lépine, Jacques R. D.; Duronea, Nicolas Urbano; et al.; A Spectral Survey of CH3CCH in the Hot Molecular Core G331.512-0.103; IOP Publishing; Astrophysical Journal; 925; 1; 3-2022; 1-180004-637XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-4357/ac36ccinfo:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4357/ac36ccinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:02:44Zoai:ri.conicet.gov.ar:11336/210900instacron: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 11:02:44.277CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv A Spectral Survey of CH3CCH in the Hot Molecular Core G331.512-0.103
title A Spectral Survey of CH3CCH in the Hot Molecular Core G331.512-0.103
spellingShingle A Spectral Survey of CH3CCH in the Hot Molecular Core G331.512-0.103
Santos, Julia
Methyl acetylene
Molecular outflows
Hot Molecular Cores
Astrochemistry
title_short A Spectral Survey of CH3CCH in the Hot Molecular Core G331.512-0.103
title_full A Spectral Survey of CH3CCH in the Hot Molecular Core G331.512-0.103
title_fullStr A Spectral Survey of CH3CCH in the Hot Molecular Core G331.512-0.103
title_full_unstemmed A Spectral Survey of CH3CCH in the Hot Molecular Core G331.512-0.103
title_sort A Spectral Survey of CH3CCH in the Hot Molecular Core G331.512-0.103
dc.creator.none.fl_str_mv Santos, Julia
Bronfman, Leonardo
Mendoza, Edgar
Lépine, Jacques R. D.
Duronea, Nicolas Urbano
Merello, Manuel
Finger, Ricardo
author Santos, Julia
author_facet Santos, Julia
Bronfman, Leonardo
Mendoza, Edgar
Lépine, Jacques R. D.
Duronea, Nicolas Urbano
Merello, Manuel
Finger, Ricardo
author_role author
author2 Bronfman, Leonardo
Mendoza, Edgar
Lépine, Jacques R. D.
Duronea, Nicolas Urbano
Merello, Manuel
Finger, Ricardo
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Methyl acetylene
Molecular outflows
Hot Molecular Cores
Astrochemistry
topic Methyl acetylene
Molecular outflows
Hot Molecular Cores
Astrochemistry
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv A spectral survey of methyl acetylene (CH3CCH) was conducted toward the hot molecular core/outflow G331.512-0.103. Our APEX observations allowed the detection of 41 uncontaminated rotational lines of CH3CCH in the frequency range between 172 and 356 GHz. Through an analysis under the local thermodynamic equilibrium assumption, by means of rotational diagrams, we determined T exc = 50 ? 1 K, N(CH3CCH) = (7.5 ? 0.4) ? 1015 cm2, X[CH3CCH/H2] ≈ (0.8-2.8) ? 10-8, and X[CH3CCH/CH3OH] ≈ 0.42 ? 0.05 for an extended emitting region (∼10″). The relative intensities of the K = 2 and K = 3 lines within a given K-ladder are strongly negatively correlated to the transitions' upper J quantum number (r = -0.84). Pure rotational spectra of CH3CCH were simulated at different temperatures, in order to interpret this observation. The results indicate that the emission is characterized by a nonnegligible temperature gradient with upper and lower limits of ∼45 and ∼60 K, respectively. Moreover, the line widths and peak velocities show an overall strong correlation with their rest frequencies, suggesting that the warmer gas is also associated with stronger turbulence effects. The K = 0 transitions present a slightly different kinematic signature than the remaining lines, indicating that they might be tracing a different gas component. We speculate that this component is characterized by lower temperatures and therefore larger sizes. Moreover, we predict and discuss the temporal evolution of the CH3CCH abundance using a two-stage zero-dimensional model of the source constructed with the three-phase Nautilus gas-grain code.
Fil: Santos, Julia. Universidade de Sao Paulo; Brasil
Fil: Bronfman, Leonardo. Universidad de Chile. Facultad de Ciencias Físicas y Matemáticas; Chile
Fil: Mendoza, Edgar. Universidade de Sao Paulo; Brasil. Universidade Federal do Rio de Janeiro; Brasil
Fil: Lépine, Jacques R. D.. Universidade de Sao Paulo; Brasil
Fil: Duronea, Nicolas Urbano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Merello, Manuel. Universidad de Chile; Chile
Fil: Finger, Ricardo. Universidad de Chile; Chile
description A spectral survey of methyl acetylene (CH3CCH) was conducted toward the hot molecular core/outflow G331.512-0.103. Our APEX observations allowed the detection of 41 uncontaminated rotational lines of CH3CCH in the frequency range between 172 and 356 GHz. Through an analysis under the local thermodynamic equilibrium assumption, by means of rotational diagrams, we determined T exc = 50 ? 1 K, N(CH3CCH) = (7.5 ? 0.4) ? 1015 cm2, X[CH3CCH/H2] ≈ (0.8-2.8) ? 10-8, and X[CH3CCH/CH3OH] ≈ 0.42 ? 0.05 for an extended emitting region (∼10″). The relative intensities of the K = 2 and K = 3 lines within a given K-ladder are strongly negatively correlated to the transitions' upper J quantum number (r = -0.84). Pure rotational spectra of CH3CCH were simulated at different temperatures, in order to interpret this observation. The results indicate that the emission is characterized by a nonnegligible temperature gradient with upper and lower limits of ∼45 and ∼60 K, respectively. Moreover, the line widths and peak velocities show an overall strong correlation with their rest frequencies, suggesting that the warmer gas is also associated with stronger turbulence effects. The K = 0 transitions present a slightly different kinematic signature than the remaining lines, indicating that they might be tracing a different gas component. We speculate that this component is characterized by lower temperatures and therefore larger sizes. Moreover, we predict and discuss the temporal evolution of the CH3CCH abundance using a two-stage zero-dimensional model of the source constructed with the three-phase Nautilus gas-grain code.
publishDate 2022
dc.date.none.fl_str_mv 2022-03
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/11336/210900
Santos, Julia; Bronfman, Leonardo; Mendoza, Edgar; Lépine, Jacques R. D.; Duronea, Nicolas Urbano; et al.; A Spectral Survey of CH3CCH in the Hot Molecular Core G331.512-0.103; IOP Publishing; Astrophysical Journal; 925; 1; 3-2022; 1-18
0004-637X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/210900
identifier_str_mv Santos, Julia; Bronfman, Leonardo; Mendoza, Edgar; Lépine, Jacques R. D.; Duronea, Nicolas Urbano; et al.; A Spectral Survey of CH3CCH in the Hot Molecular Core G331.512-0.103; IOP Publishing; Astrophysical Journal; 925; 1; 3-2022; 1-18
0004-637X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-4357/ac36cc
info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4357/ac36cc
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 IOP Publishing
publisher.none.fl_str_mv IOP Publishing
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 12.982451

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