Observations of neutral atomic carbon at 809 GHz.
Astrophys J
; 307(2 Pt 2): L75-9, 1986 Aug 15.
Article
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| MEDLINE
| ID: mdl-11542217
ABSTRACT
We have detected the 809 GHz 3P2-3P1 fine-structure line of neutral atomic carbon in four dense molecular clouds M17, W51, W3, and DR 21(OH). These observations complement the published observations of the 492 GHz 3P1-3P0 line and allow the excitation temperature of the 3P levels along with the line optical depths to be determined. The results indicate excitation temperatures Tx approximately 30-60 K and optical depths of tau 10 < or approximately 1. This implies that the approximately 10(18) cm-2 lower limit to the C I abundance derived from 492 GHz observations is probably the actual abundance, which gives C I/CO approximately 0.1 in dense molecular clouds.
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Bases de datos:
MEDLINE
Asunto principal:
Carbono
/
Medio Ambiente Extraterrestre
Idioma:
En
Revista:
Astrophys J
Año:
1986
Tipo del documento:
Article
País de afiliación:
Estados Unidos