Far-Infrared detection of methylene
| Autor: | S. Bruenken, J.-P. Baluteau, Gisbert Winnewisser, Karl M. Menten, E. T. Polehampton |
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| Přispěvatelé: | Laboratoire d'Astrophysique de Marseille (LAM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
individual objects
molecular data Analytical chemistry FOS: Physical sciences Astrophysics 01 natural sciences [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] chemistry.chemical_compound Far infrared 0103 physical sciences W49 Molecule Sagittarius B2 Methylene 010306 general physics Absorption (electromagnetic radiation) 010303 astronomy & astrophysics Physics infrared: ISM Spectrometer Molecular cloud Astrophysics (astro-ph) Sagittarius B2 -ISM Astronomy and Astrophysics molecules -molecular data -ISM ISM: molecules Interstellar medium chemistry 13. Climate action Space and Planetary Science ISM: individual objects: W49 ISM -ISM infrared ISM: individual objects: Sagittarius B2 |
| Zdroj: | Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, EDP Sciences, 2005, 431 (1), pp.203. ⟨10.1051/0004-6361:20041598⟩ Astronomy and Astrophysics-A&A, 2005, 431 (1), pp.203. ⟨10.1051/0004-6361:20041598⟩ |
| ISSN: | 0004-6361 |
| DOI: | 10.1051/0004-6361:20041598⟩ |
| Popis: | We present a clear detection of CH2 in absorption towards the molecular cloud complexes Sagittarius B2 and W49 N using the ISO Long Wavelength Spectrometer. These observations represent the first detection of its low excitation rotational lines in the interstellar medium. Towards Sagittarius B2, we detect both ortho and para transitions allowing a determination of the total CH2 column density of N(CH2)=(7.5+/-1.1)x10^14 cm^-2. We compare this with the related molecule, CH, to determine [CH/CH2]=2.7+/-0.5. Comparison with chemical models shows that the CH abundance along the line of sight is consistent with diffuse cloud conditions and that the high [CH/CH2] ratio can be explained by including the effect of grain-surface reactions. Comment: 11 pages, 4 figures, accepted for publication in A&A |
| Databáze: | OpenAIRE |
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