Cyanoacetylene in the outflow/hot molecular core G331.512-0.103
Using APEX-1 and APEX-2 observations, we have detected and studied the rotational lines of the HC₃N molecule (cyanoacetylene) in the powerful outflow/hot molecular core G331.512−0.103. We identified 31 rotational lines at J levels between 24 and 39; 17 of them in the ground vibrational state v = 0 (...
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| Autores principales: | , , , , , , , , , , , , |
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| Formato: | Articulo Preprint |
| Lenguaje: | Inglés |
| Publicado: |
2019
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/125362 |
| Aporte de: |
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I19-R120-10915-125362 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Astronómicas Astrochemistry Stars: formation ISM: abundances ISM: jets and outflows |
| spellingShingle |
Ciencias Astronómicas Astrochemistry Stars: formation ISM: abundances ISM: jets and outflows Duronea, Nicolás Urbano Bronfman, Leonardo Mendoza, E. Merello, Manuel Finger, Ricardo Reyes, Nicolas Hervías-Caimapo, C. Faure, Alexandre Cappa, Cristina Elisabet Arnal, Edmundo Marcelo Lépine, Jacques Raymond Daniel Kleiner, I. Nyman, Lars-Åke Cyanoacetylene in the outflow/hot molecular core G331.512-0.103 |
| topic_facet |
Ciencias Astronómicas Astrochemistry Stars: formation ISM: abundances ISM: jets and outflows |
| description |
Using APEX-1 and APEX-2 observations, we have detected and studied the rotational lines of the HC₃N molecule (cyanoacetylene) in the powerful outflow/hot molecular core G331.512−0.103. We identified 31 rotational lines at J levels between 24 and 39; 17 of them in the ground vibrational state v = 0 (9 lines corresponding to the main C isotopologue and 8 lines corresponding to the ¹³C isotopologues), and 14 in the lowest vibrationally excited state v₇ = 1. Using local thermodynamic equilibrium (LTE)-based population diagrams for the beam-diluted v = 0 transitions, we determined T<sub>exc</sub> = 85 ± 4 K and N(HC₃N) = (6.9 ± 0.8) × 10¹⁴ cm⁻², while for the beam-diluted v₇ = 1 transitions we obtained T<sub>exc</sub>= 89 ± 10 K and N(HC₃N) = (2 ± 1) × 10¹⁵ cm⁻². Non-LTE calculations using H₂ collision rates indicate that the HC3N emission is in good agreement with LTE-based results. From the non-LTE method, we estimated T<sub>kin</sub> ≃90 K, n(H₂) ≃ 2 × 10⁷ cm⁻³ for a central core of 6 arcsec in size. A vibrational temperature in the range from 130 to 145 K was also determined, values which are very likely lower limits. Our results suggest that rotational transitions are thermalized, while infrared radiative pumping processes are probably more efficient than collisions in exciting the molecule to the vibrationally excited state v₇ = 1. Abundance ratios derived under LTE conditions for the ¹³C isotopologues suggest that the main formation pathway of HC₃N is C₂H₂ + CN → HC₃N + H. |
| format |
Articulo Preprint |
| author |
Duronea, Nicolás Urbano Bronfman, Leonardo Mendoza, E. Merello, Manuel Finger, Ricardo Reyes, Nicolas Hervías-Caimapo, C. Faure, Alexandre Cappa, Cristina Elisabet Arnal, Edmundo Marcelo Lépine, Jacques Raymond Daniel Kleiner, I. Nyman, Lars-Åke |
| author_facet |
Duronea, Nicolás Urbano Bronfman, Leonardo Mendoza, E. Merello, Manuel Finger, Ricardo Reyes, Nicolas Hervías-Caimapo, C. Faure, Alexandre Cappa, Cristina Elisabet Arnal, Edmundo Marcelo Lépine, Jacques Raymond Daniel Kleiner, I. Nyman, Lars-Åke |
| author_sort |
Duronea, Nicolás Urbano |
| title |
Cyanoacetylene in the outflow/hot molecular core G331.512-0.103 |
| title_short |
Cyanoacetylene in the outflow/hot molecular core G331.512-0.103 |
| title_full |
Cyanoacetylene in the outflow/hot molecular core G331.512-0.103 |
| title_fullStr |
Cyanoacetylene in the outflow/hot molecular core G331.512-0.103 |
| title_full_unstemmed |
Cyanoacetylene in the outflow/hot molecular core G331.512-0.103 |
| title_sort |
cyanoacetylene in the outflow/hot molecular core g331.512-0.103 |
| publishDate |
2019 |
| url |
http://sedici.unlp.edu.ar/handle/10915/125362 |
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