G331.512-0.103: An interstellar laboratory for molecular synthesis. I. the ortho-to-para ratios for CH3OH and CH3CN
Author
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Mendoza, Edgar
Author
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Bronfman Aguiló, Leonardo
Author
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Duronea, Nicolas U.
Author
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Lepine, Jacques R. D.
Author
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Finger Camus, Ricardo
Author
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Merello, Manuel
Author
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Hervías-Caimapo, Carlos
Author
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Gama, Diana R. G.
Author
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Reyes, Nicolás
Author
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Ake Nyman, Lars
Admission date
dc.date.accessioned
2018-07-27T20:03:04Z
Available date
dc.date.available
2018-07-27T20:03:04Z
Publication date
dc.date.issued
2018
Cita de ítem
dc.identifier.citation
Astrophysical Journal Volumen: 853 Número: 2 Número de artículo: 152
es_ES
Identifier
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10.3847/1538-4357/aaa1ec
Identifier
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https://repositorio.uchile.cl/handle/2250/150406
Abstract
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Spectral line surveys reveal rich molecular reservoirs in G331.512-0.103, a compact radio source in the center of an energetic molecular outflow. In this first work, we analyze the physical conditions of the source by means of CH3OH and CH3CN. The observations were performed with the APEX Telescope. Six different system configurations were defined to cover most of the band within (292-356). GHz; as a consequence, we detected a forest of lines toward the central core. A total of 70 lines of A/E-CH3OH and A/E-CH3CN were analyzed, including torsionally excited transitions of CH3OH (nu(t) = 1). In a search for all the isotopologues, we identified transitions of (CH3OH)-C-13. The physical conditions were derived considering collisional and radiative processes. We found common temperatures for each A and E symmetry of CH3OH and CH3CN; the derived column densities indicate an A/E equilibrated ratio for both tracers. The results reveal that CH3CN and CH3OH trace a hot and cold component with T-k similar to 141. K and T-k similar to 74. K, respectively. In agreement with previous ALMA observations, the models show that the emission region is compact (<= 5 ''. 5) with gas density n(H-2) = (0.7-1)x10(7) cm(-3). The (CHOH)-O-3/(CHCN)-C-3 abundance ratio and the evidences for prebiotic and complex organic molecules suggest a rich and active chemistry toward G331.512-0.103.
es_ES
Patrocinador
dc.description.sponsorship
CONICET
PIP 00356
UNLP
11G/120
PPID/G002
CONICYT
BASAL PFB-06
Sao Paulo Research Foundation (FAPESP)
2014/22095-6