A spectral survey of CH3CCH in the hot molecular core G331.512-0.103
Author
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Santos, Julia C.
Author
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Bronfman Aguiló, Leonardo Jaime
Author
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Mendoza, Edgar
Author
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Lépine, Jacques R. D.
Author
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Duronea, Nicolas U.
Author
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Merello Ferrada, Manuel Antonio
Author
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Finger Camus, Ricardo Alberto
Admission date
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2022-12-07T15:23:19Z
Available date
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2022-12-07T15:23:19Z
Publication date
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2022
Cita de ítem
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The Astrophysical Journal, 925:3 (13pp), 2022 January 20
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Identifier
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10.3847/1538-4357/ac36cc
Identifier
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https://repositorio.uchile.cl/handle/2250/189664
Abstract
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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) x 10(15) cm(2), X[CH3CCH/H-2] approximate to (0.8-2.8) x 10(-8), and X[CH3CCH/CH3OH] approximate to 0.42 +/- 0.05 for an extended emitting region (similar to 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 similar to 45 and similar to 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.
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Patrocinador
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Atacama Pathfinder Experiment (APEX) C-094.F-9709B-2014
C-097.F-9710A-2016
C-099.F-9702A-2017
C-0102.F-9702B-2018
ANID BASAL project FB210003
Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) 2014/22095-6
Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ) 150465/2019-0
ANID, Programa de Astronomia Fondo ALMA-CONICYT, project 3119AS0001
ANID through the ALMA-CONICYT 31180005
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Lenguage
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en
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Publisher
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IOP
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Type of license
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Attribution-NonCommercial-NoDerivs 3.0 United States