ANDERSON, Julie K.; ZIURYS, Lucy M.; HERPIN, Fabrice

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ANDERSON, Julie K.

ZIURYS, Lucy M.

HERPIN, Fabrice
FORMATION STELLAIRE 2013

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Communication dans un congrès

Ce document a été publié dans

68th International Symposium on Molecular Spectroscopy, held 17-21 June, 2013 at Ohio State University. Abstract id. #ETI03, 2013, Ohio.

Résumé en anglais

The formation of CH^{+} in the interstellar medium has been an enigma for the past 70 years. Emission from the species is found in diffuse material, even though the major pathway leading to the species, C^{+} + H{_2}, is endothermic by 0.40 eV. The barrier for this reaction can be greatly reduced if the H{_2} is vibrationally excited. Using the Heterodyne Instrument for the Far Infrared (HIFI) on board the Herschel Space Observatory, we have mapped CH^{+} (J=1 → 0), CH^{+} (J=2 → 1), and C^{+} (J=3/2 → 1/2) across the face of the young planetary nebula, NGC 7027. Analysis of the spectra has shown that CH^{+}, C^{+}, and vibrationally excited H{_2} apparently trace the same outflow in NGC 7027. Therefore CH^{+} in this nebula likely forms from the activated C^{+} + H{_2} reaction. Spectral maps, temperatures, and abundances of CH^{+} will be presented along with spectral maps of C^{+}.< Réduire

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ASTRONOMICAL SPECIES AND PROCESSES

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Importé de hal

Unités de recherche

Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804