Unveiling the chemistry of hot protostellar cores with ALMA |
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| Authors: | M Guélin N Brouillet J Cernicharo F Combes A Wooten |
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| Institution: | (1) IRAM, 300 rue de la piscine, 38406 St. Martin d’Hères, France;(2) L3AB, CNRS UMR5804, OASU, 2 rue de l’Observatoire, BP 89, 33270 Floirac, France;(3) Dept. Molecular and Infrared Astrophysics, Instituto de Estructura de la Materia, CSIC, Serrano 121, 28006 Madrid, Spain;(4) Observatoire de Paris, LERMA, 61 av. de l’Observatoire, 75014 Paris, France;(5) National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475, USA |
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| Abstract: | High angular resolution mm-wave observations of the Orion-KL region, made with the IRAM Plateau de Bure interferometer (PdBI),
reveal the presence of several cores of size 103 AU, which have distinct spectral signatures. Complex molecules such as ethanol, vinyl cyanide and dimethyl ether show different
distributions and their relative abundance varies from core to core by orders of magnitude. The molecular column densities
derived in the cores also differ widely from the beam-averaged column densities observed with large single-dish telescopes.
Obviously, the predictions of hot core chemistry models must be checked against high resolution observations. ALMA, which
allies sensitivity and high angular resolution, will be a key instrument for this type of studies.
The PdBI observations were part of a search for interstellar glycine, also carried out with the IRAM 30-m telescope and the
Green Bank Telescope. We derive a 3σ upper limit on the column density of glycine of 1×1015 cm−2 per 2″×3″ beam in the Orion Hot Core and Compact Ridge.
Based on observations made with the IRAM PdB Interferometer, the IRAM 30-m telescope and the NRAO Green-Bank telescope. IRAM
is supported by CNRS, MPG and IGN. |
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| Keywords: | Astrochemistry Astrobiology Line: identification Molecular processes Techniques: high angular resolution ISM: abundances |
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