Reversal of infall in SgrB2(M) revealed by Herschel/HIFI observations of HCN lines at THz frequencies

[1007.5131] Reversal of infall in SgrB2(M) revealed by Herschel/HIFI observations of HCN lines at THz frequencies Skip to main content Search Submit Donate Log in Astrophysics > Astrophysics of Galaxies arXiv:1007.5131 (astro-ph) [Submitted on 29 Jul 2010] Title: Reversal of infall in SgrB2(M) revealed by Herschel/HIFI observations of HCN lines at THz frequencies Authors: Rainer Rolffs , Peter Schilke , Claudia Comito , E.A. Bergin , F.F.S. van der Tak , D.C. Lis , S.-L. Qin , K.M. Menten , R. Guesten , T.A. Bell , G.A. Blake , E. Caux , C. Ceccarelli , J. Cernicharo , N.R. Crockett , F. Daniel , M.-L. Dubernet , M. Emprechtinger , P. Encrenaz , M. Gerin , T.F. Giesen , J.R. Goicoechea , P.F. Goldsmith , H. Gupta , E. Herbst , C. Joblin , D. Johnstone , W.D. Langer , W.D. Latter , S.D. Lord , S. Maret , P.G. Martin , G.J. Melnick , P. Morris , H.S.P. Mueller , J.A. Murphy , V. Ossenkopf , J.C. Pearson , M. Perault , T.G. Phillips , R. Plume , S. Schlemmer , J. Stutzki , N. Trappe , C. Vastel , S. Wang , H.W. Yorke , S. Yu , J. Zmuidzinas , M.C. Diez-Gonzalez , R. Bachiller , J. Martin-Pintado , W. Baechtold , M. Olberg , L.H. Nordh , J.J. Gill , G. Chattopadhyay View PDF HTML (experimental) Abstract: 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. 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. The HCN line profiles are asymmetric, with the emission peak shifting from blue to red with increasing J and decreasing line opacity (HCN to H$^{13}$CN). 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. 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. Comments: A&A, HIFI special issue, accepted Subjects: Astrophysics of Galaxies (astro-ph.GA) Cite as: arXiv:1007.5131 [astro-ph.GA] (or arXiv:1007.5131v1 [astro-ph.GA] for this version) https://doi.org/10.48550/arXiv.1007.5131 Focus to learn more arXiv-issued DOI via DataCite Journal reference: Astron. Astrophys. 521 (2010) L46 Related DOI : https://doi.org/10.1051/0004-6361/201015106 Focus to learn more DOI(s) linking to related resources Submission history From: Peter Schilke [ view email ] [v1] Thu, 29 Jul 2010 07:32:03 UTC (2,916 KB) Full-text links: Access Paper: View PDF HTML (experimental) TeX Source view license Current browse context: astro-ph.GA < prev | next > new | recent | 2010-07 Change to browse by: astro-ph References & Citations SciX Google Scholar Semantic Scholar export BibTeX citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer ( What is the Explorer? ) Connected Papers Toggle Connected Papers ( What is Connected Papers? ) Litmaps Toggle Litmaps ( What is Litmaps? ) scite.ai Toggle scite Smart Citations ( What are Smart Citations? ) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv ( What is alphaXiv? ) Links to Code Toggle CatalyzeX Code Finder for Papers ( What is CatalyzeX? ) DagsHub Toggle DagsHub ( What is DagsHub? ) GotitPub Toggle Gotit.pub ( What is GotitPub? ) Huggingface Toggle Hugging Face ( What is Huggingface? ) ScienceCast Toggle ScienceCast ( What is ScienceCast? ) Demos Demos Replicate Toggle Replicate ( What is Replicate? ) Spaces Toggle Hugging Face Spaces ( What is Spaces? ) Spaces Toggle TXYZ.AI ( What is TXYZ.AI? ) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower ( What are Influence Flowers? ) Core recommender toggle CORE Recommender ( What is CORE? ) IArxiv recommender toggle IArxiv Recommender ( What is IArxiv? ) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. 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