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Reversal of infall ...
Reversal of infall in SgrB2(M) revealed by Herschel/HIFI observations of HCN lines at THz frequencies
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- Rolffs, R. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),Universität zu Köln,University of Cologne,University of Michigan,Centro de Astrobiologia (CAB),University of Calgary,Observatorio de Yebes (IGN),Yebes Observatory
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- Schilke, P. (author)
- Universität zu Köln,University of Cologne,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Comito, C. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),California Institute of Technology (Caltech),Institut National des Sciences de l'Univers,Université de Toulouse,University of Toulouse,Observatorio de Yebes (IGN),Yebes Observatory
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- Bergin, E. A. (author)
- University of Michigan
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- van der Tak, F. F. S. (author)
- Netherlands Institute for Space Research (SRON),Universität zu Köln,University of Cologne
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- Lis, D. C. (author)
- California Institute of Technology (Caltech)
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- Qin, S. L. (author)
- Universität zu Köln,University of Cologne
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- Menten, K. M. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Güsten, R. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Bell, T. A. (author)
- California Institute of Technology (Caltech)
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- Blake, G. A. (author)
- California Institute of Technology (Caltech)
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- Caux, E. (author)
- Université de Toulouse,University of Toulouse,Institut National des Sciences de l'Univers
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Ceccarelli, C. (author)
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- Cernicharo, J. (author)
- Centro de Astrobiologia (CAB)
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- Crockett, N. R. (author)
- University of Michigan
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- Daniel, F. (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France,Centro de Astrobiologia (CAB)
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- Dubernet, M. L. (author)
- Observatoire de Paris-Meudon
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- Emprechtinger, M. (author)
- California Institute of Technology (Caltech)
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- Encrenaz, P. (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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- Gerin, M. (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France,Institut canadien d'astrophysique théorique,Canadian Institute for Theoretical Astrophysics,Harvard-Smithsonian Center for Astrophysics
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- Giesen, T. F. (author)
- Universität zu Köln,University of Cologne
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- Goicoechea, J. R. (author)
- Centro de Astrobiologia (CAB)
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Goldsmith, P. F. (author)
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Gupta, H. (author)
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- Herbst, E. (author)
- Ohio State University
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- Joblin, C. (author)
- Institut National des Sciences de l'Univers,Université de Toulouse,University of Toulouse
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- Johnstone, D. (author)
- National Research Council Canada
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- Langer, W. D. (author)
- California Institute of Technology (Caltech)
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- Latter, W. D. (author)
- California Institute of Technology (Caltech)
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- Lord, S. D. (author)
- California Institute of Technology (Caltech)
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Maret, S. (author)
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- Martin, P. G. (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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- Melnick, G. J. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Morris, P. (author)
- California Institute of Technology (Caltech)
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- Muller, Holger (author)
- Universität zu Köln,University of Cologne
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- Murphy, J. A. (author)
- Maynooth University
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- Ossenkopf, V. (author)
- Netherlands Institute for Space Research (SRON),Universität zu Köln,University of Cologne
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Pearson, J. C. (author)
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- Perault, M. (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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- Phillips, T. G. (author)
- California Institute of Technology (Caltech)
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- Plume, R. (author)
- University of Calgary
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- Schlemmer, S. (author)
- Universität zu Köln,University of Cologne,University of Michigan
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- Stutzki, J. (author)
- Universität zu Köln,University of Cologne
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- Trappe, N. (author)
- Maynooth University
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- Vastel, C. (author)
- Université de Toulouse,University of Toulouse,Institut National des Sciences de l'Univers
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- Wang, S. (author)
- University of Michigan
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Yorke, H. W. (author)
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Yu, S. (author)
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- Zmuidzinas, J. (author)
- California Institute of Technology (Caltech)
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- Diez-Gonzalez, M. C. (author)
- Observatorio de Yebes (IGN),Yebes Observatory
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- Bachiller, R. (author)
- Observatorio de Yebes (IGN),Yebes Observatory
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- Martin-Pintado, J. (author)
- CSIC - Instituto de Estructura de la Materia (IEM)
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- Baechtold, W. (author)
- Eidgenössische Technische Hochschule Zürich (ETH),Swiss Federal Institute of Technology in Zürich (ETH)
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- Olberg, Michael, 1956 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Nordh, Lennart H. (author)
- Stockholms universitet,Institutionen för astronomi,Stockholm University
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Gill, John (author)
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Chattopadhyay, Goutam (author)
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Max Planck Gesellschaft zur Förderung der Wissenschaften eV. (MPG) Universität zu Köln (creator_code:org_t)
- 2010-10-01
- 2010
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 521:1, s. Article Number: L46 -
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Abstract
Subject headings
Close
- Aims. To investigate the accretion and feedback processes in massive star formation, we analyze the shapes of emission lines from hot molecular cores, whose asymmetries trace infall and expansion motions. Methods. The high-mass star forming region SgrB2(M) was observed with Herschel/HIFI (HEXOS key project) in various lines of HCN and its isotopologues, complemented by APEX data. The observations are compared to spherically symmetric, centrally heated models with density power-law gradient and different velocity fields (infall or infall+expansion), using the radiative transfer code RATRAN. Results. The HCN line profiles are asymmetric, with the emission peak shifting from blue to red with increasing J and decreasing line opacity (HCN to (HCN)-C-13). This is most evident in the HCN 12-11 line at 1062 GHz. These line shapes are reproduced by a model whose velocity field changes from infall in the outer part to expansion in the inner part. Conclusions. The qualitative reproduction of the HCN lines suggests that infall dominates in the colder, outer regions, but expansion dominates in the warmer, inner regions. We are thus witnessing the onset of feedback in massive star formation, starting to reverse the infall and finally disrupting the whole molecular cloud. To obtain our result, the THz lines uniquely covered by HIFI were critically important.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- submillimeter: ISM
- ISM: structure
- cologne database
- facility
- ISM: kinematics and dynamics
- outflow
- b2
- star-formation
- ISM: individual objects: SgrB2(M)
- cdms
- stars: formation
- molecules
- molecular-spectroscopy
- ISM
- Astronomy and astrophysics
Publication and Content Type
- art (subject category)
- ref (subject category)
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To the university's database
- By the author/editor
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Rolffs, R.
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Schilke, P.
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Comito, C.
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Bergin, E. A.
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van der Tak, F. ...
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Lis, D. C.
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show more...
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Qin, S. L.
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Menten, K. M.
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Güsten, R.
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Bell, T. A.
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Blake, G. A.
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Caux, E.
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Ceccarelli, C.
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Cernicharo, J.
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Crockett, N. R.
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Daniel, F.
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Dubernet, M. L.
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Emprechtinger, M ...
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Encrenaz, P.
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Gerin, M.
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Giesen, T. F.
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Goicoechea, J. R ...
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Goldsmith, P. F.
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Gupta, H.
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Herbst, E.
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Joblin, C.
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Johnstone, D.
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Langer, W. D.
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Latter, W. D.
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Lord, S. D.
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Maret, S.
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Martin, P. G.
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Melnick, G. J.
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Morris, P.
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Muller, Holger
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Murphy, J. A.
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Ossenkopf, V.
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Pearson, J. C.
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Perault, M.
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Phillips, T. G.
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Plume, R.
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Schlemmer, S.
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Stutzki, J.
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Trappe, N.
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Vastel, C.
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Wang, S.
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Yorke, H. W.
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Yu, S.
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Zmuidzinas, J.
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Diez-Gonzalez, M ...
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Bachiller, R.
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Martin-Pintado, ...
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Baechtold, W.
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Olberg, Michael, ...
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Nordh, Lennart H ...
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Gill, John
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Chattopadhyay, G ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
- Articles in the publication
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Astronomy and As ...
- By the university
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Chalmers University of Technology
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Stockholm University