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Excitation of methyl cyanide in the hot core of the Orion

1986; IOP Publishing; Volume: 311; Linguagem: Inglês

10.1086/164829

1538-4357

E. C. Sutton, Geoffrey A. Blake, R. Genzel, C. R. Masson, T. G. Phillips,

Astro and Planetary Science

view Abstract Citations (32) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Excitation of Methyl Cyanide in the Hot Core of Orion Sutton, E. C. ; Blake, Geoffrey A. ; Genzel, R. ; Masson, C. R. ; Phillips, T. G. Abstract The excitation of CH3CN in the hot core of Orion is examined using high-sensitivity observational data at 1.3 mm. Observed line fluxes are analyzed by means of multilevel statistical equilibrium calculations. The analysis is applied to both optically thin models of the hot core region and models with significant optical depths. Trapping is found to play a critical role in the excitation of CH3CN. An optically thin analysis yields a kinetic temperature of 275K and a cloud density of 2×106cm-3. However, significant optical depths are expected if the hot core source is as small as 10arcsec. In this case, the cloud density and temperature are lowered to 1.5×106cm-3 and 240K. Publication: The Astrophysical Journal Pub Date: December 1986 DOI: 10.1086/164829 Bibcode: 1986ApJ...311..921S Keywords: Acetonitrile; Astronomical Spectroscopy; Mass Distribution; Molecular Clouds; Orion Nebula; Astronomical Models; Collision Rates; Optical Thickness; Radiative Transfer; Statistical Distributions; Astrophysics; INTERSTELLAR: MOLECULES; NEBULAE: ORION NEBULA; RADIATIVE TRANSFER full text sources ADS | data products SIMBAD (2)