| HAL: hal-00520749, version 1 |
| arXiv: 1008.2513 |
| DOI: 10.1051/0004-6361/201015118 |
| Detailed view | Export this paper |
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| Astronomy and Astrophysics 521 (2010) id.L39 |
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| The methanol lines and hot core of OMC2-FIR4, an intermediate-mass protostar, with Herschel-HIFI |
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| M. Kama 1C. Dominik 2 |
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| (2010) |
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| In contrast with numerous studies on the physical and chemical structure of low- and high-mass protostars, much less is known about their intermediate-mass counterparts, a class of objects that could help to elucidate the mechanisms of star formation on both ends of the mass range. We present the first results from a rich HIFI spectral dataset on an intermediate-mass protostar, OMC2-FIR4, obtained in the CHESS (Chemical HErschel SurveyS of star forming regions) key programme. The more than 100 methanol lines detected between 554 and 961 GHz cover a range in upper level energy of 40 to 540 K. Our physical interpretation focusses on the hot core, but likely the cold envelope and shocked regions also play a role in reality, because an analysis of the line profiles suggests the presence of multiple emission components. An upper limit of 10^-6 is placed on the methanol abundance in the hot core, using a population diagram, large-scale source model and other considerations. This value is consistent with abundances previously seen in low-mass hot cores. Furthermore, the highest energy lines at the highest frequencies display asymmetric profiles, which may arise from infall around the hot core. |
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| 1: | Laboratoire d'Astrophysique de Grenoble (LAOG) |
| CNRS : UMR5571 – OSUG – INSU – Université Joseph Fourier - Grenoble I | |
| 2: | Astronomical Institute "Anton Pannekoek'' |
| University of Amsterdam | |
| 3: | Centre d'étude spatiale des rayonnements (CESR) |
| CNRS : UMR5187 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III | |
| 4: | Laboratoire d'Astrophysique de Bordeaux (LAB) |
| CNRS : UMR5804 – INSU – Université Sciences et Technologies - Bordeaux I | |
| 5: | Observatoire aquitain des sciences de l'univers (OASU) |
| CNRS : UMS2567 – INSU – Université Sciences et Technologies - Bordeaux I | |
| 6: | Université Sciences et Technologies - Bordeaux 1 |
| Université Sciences et Technologies - Bordeaux I | |
| 7: | Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux (L3AB) |
| CNRS : UMR5804 – INSU – Université Sciences et Technologies - Bordeaux I | |
| 8: | Civilisations atlantiques & Archéosciences (C2A) |
| CNRS : UMR6566 – Ministère de la culture – Université de Nantes – Université de Rennes 1 | |
| 9: | Harvard-Smithsonian Center for Astrophysics |
| Harvard-Smithsonian Center for Astrophysics | |
| 10: | Laboratoire Optimisation de la Conception et Ingénierie de l'Environnement (LOCIE) |
| Université de Savoie – CNRS : FRE3220 | |
| 11: | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA) |
| CNRS : UMR8112 – INSU – Observatoire de Paris – Université Pierre et Marie Curie [UPMC] - Paris VI – Université de Cergy Pontoise – Ecole normale supérieure de Paris - ENS Paris | |
| 12: | Osservatorio Astrofisico di Arcetri (INAF) |
| Osservatorio Astrofisico di Arcetri | |
| 13: | Osservatorio di arcetri (INAF) |
| INFN | |
| 14: | Osservatorio Astrofisico di Arcetri (INAF) |
| INFN | |
| 15: | Centro de Investigaciones Biológicas (CSIC) |
| Consejo Superior de Investigaciones Cientificas | |
| 16: | Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides (CASSIOPEE) |
| Université Nice Sophia Antipolis [UNS] – CNRS : UMR6202 – Observatoire de la Côte d'Azur – INSU | |
| 17: | Laboratoire de Radio Astronomie de l'ENS (LRA) |
| CNRS : FRE2460 – Observatoire de Paris | |
| 18: | Max-Planck-Institut für Astronomie (MPIA) |
| Max-Planck-Institut | |
| 19: | The Ohio State University (Department of Physics) |
| The Ohio State University | |
| 20: | Observatoire de Haute-Provence (OHP) |
| CNRS : USR2207 – INSU – Université de Provence - Aix-Marseille I | |
| 21: | Osservatorio Astrofisico di Arcetri |
| INAF | |
| 22: | Osservatorio di Astrofisica di Roma (OAR) |
| INAF | |
| 23: | Centre d'Etude Spatiale des Rayonnements |
| Aucune | |
| 24: | Interplanetary Space Physics Institute (IFSI) (IFSI-INAF) |
| Interplanetary Space Physics Institute | |
| 25: | Max-Planck-Institut für Radioastronomie (MPIFR) |
| Max-Planck-Institut | |
| 26: | Institute for Space Research Netherlands (SRON) |
| SRON Netherlands Institute for Space Research | |
| 27: | MPI f"ur Radioastronomie (MpIfR) |
| Max-Planck-Institut | |
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| Subject | : | Sciences of the Universe/Astrophysics/Solar and Stellar Astrophysics Physics/Astrophysics/Solar and Stellar Astrophysics |
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| Astrophysics - Galaxy Astrophysics |
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| Fulltext link: |
| hal-00520749, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00520749 | |
| oai:hal.archives-ouvertes.fr:hal-00520749 | |
| From: Marie-Paule Pomies | |
| Submitted on: Friday, 24 September 2010 10:38:33 | |
| Updated on: Wednesday, 1 December 2010 12:20:55 | |