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The internal structure of molecular clouds. III : Evidence for molecular depletion in the NGC 2024 condensations

R. Mauersberger, Thomas L. Wilson, P. G. Mezger, Ralph A. Gaume, K. J. Johnston

Open publisher page 13 citations

Abstract

Maps of the star forming region NGC2024 in the mm-wave transitions of C 34 S, C 17 O and C 18 O, obtained at the IRAM 30-m telescope, with angular resolutions of 21″ to 12″ are presented. Using the Very Large Array, NGC2024 has been imaged in the (J,K)=(1,1) and (2,2) inversion lines of NH 3 and the λ=1.3 cm continuum with a resolution of 3″. The mm-wave dust emission peaks NGC2024: FIR 1 to 7 reported by Mezger et al. (1988, 1992) to be candidates for protostellar objects are not seen in C 18 O. The contrast in the C 34 S maps is similar to that found in dust emission, but positions and angular sizes of the maxima do not agree very well

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What this paper is about

Maps of the star forming region NGC2024 in the mm-wave transitions of C 34 S, C 17 O and C 18 O, obtained at the IRAM 30-m telescope, with angular resolutions of 21″ to 12″ are presented. Using the Very Large Array, NGC2024 has been imaged in the (J,K)=(1,1) and (2,2) inversion lines of NH 3 and the λ=1.3 cm continuum with a resolution of 3″. The mm-wave dust emission peaks NGC2024: FIR 1 to 7 reported by Mezger et al. (1988, 1992) to be candidates for protostellar objects are not seen in C 18 O. The contrast in the C 34 S maps is similar to that found in dust emission, but positions and angular sizes of the maxima do not agree very well

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Available abstract

Maps of the star forming region NGC2024 in the mm-wave transitions of C 34 S, C 17 O and C 18 O, obtained at the IRAM 30-m telescope, with angular resolutions of 21″ to 12″ are presented. Using the Very Large Array, NGC2024 has been imaged in the (J,K)=(1,1) and (2,2) inversion lines of NH 3 and the λ=1.3 cm continuum with a resolution of 3″. The mm-wave dust emission peaks NGC2024: FIR 1 to 7 reported by Mezger et al. (1988, 1992) to be candidates for protostellar objects are not seen in C 18 O. The contrast in the C 34 S maps is similar to that found in dust emission, but positions and angular sizes of the maxima do not agree very well

Key concepts: Physics, Astrophysics, Molecular cloud, Angular resolution (graph drawing), Astronomy, Telescope, Protostar, Star formation

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