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    Herschel observations of EXtra-Ordinary Sources (HEXOS): The present and future of spectral surveys with Herschel/HIFI

    Bergin, E.A. and Phillips , T.G. and Comito, C. and Crockett, N.R. and Lis, D.C. and Schilke, P. and Wang, S. and Bell, T.A. and Blake, G.A. and Bumble, B. and Caux, E. and Cabrit, S. and Ceccarelli, C. and Cernicharo, J. and Daniel, F. and de Graauw, Th. and Dubernet, M.-L. and Emprechtinger, M. and Encrenaz, P. and Falgarone, E. and Gerin, M. and Giesen, T.F. and Goicoechea, J.R. and Goldsmith, P.F. and Gupta, H. and Hartogh, P. and Helmich, F.P. and Herbst, E. and Joblin, C. and Johnstone, D. and Kawamura, J.H. and Langer, W.D. and Latter, W.B. and Lord, S.D. and Maret, S. and Martin, P.G. and Melnick, G.J. and Menten, K.M. and Morris, P. and Muller, H.S.P. and Murphy, J.Anthony and Neufeld, D.A. and Ossenkopf, V. and Pagani, L. and Pearson, J.C. and Perault, M. and Plume, R. and Qin, S.-L. and Roelfsema, P. and Salez, M. and Schlemmer, S. and Stutzki, J. and Tielens, A.G.G.M. and Trappe, Neil and van der Tak, F.F.S. and Vastel, C. and Yorke, H.W. and Yu, S. and Zmuidzinas, J. (2010) Herschel observations of EXtra-Ordinary Sources (HEXOS): The present and future of spectral surveys with Herschel/HIFI. Astronomy & Astrophysics, 521 (L20). pp. 1-6. ISSN 0004-6361

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    We present initial results from the Herschel GT key program: Herschel observations of EXtra-Ordinary Sources (HEXOS) and outline the promise and potential of spectral surveys with Herschel/HIFI. The HIFI instrument offers unprecedented sensitivity, as well as continuous spectral coverage across the gaps imposed by the atmosphere, opening up a largely unexplored wavelength regime to high-resolution spectroscopy. We show the spectrum of Orion KL between 480 and 560 GHz and from 1.06 to 1.115 THz. From these data, we confirm that HIFI separately measures the dust continuum and spectrally resolves emission lines in Orion KL. Based on this capability we demonstrate that the line contribution to the broad-band continuum in this molecule-rich source is ∼20−40% below 1 THz and declines to a few percent at higher frequencies. We also tentatively identify multiple transitions of HD18O in the spectra. The first detection of this rare isotopologue in the interstellar medium suggests that HDO emission is optically thick in the Orion hot core with HDO/H2O ∼ 0.02. We discuss the implications of this detection for the water D/H ratio in hot cores.

    Item Type: Article
    Additional Information: © ESO 2010 The original publication is available at DOI: 10.1051/0004-6361/201015071
    Keywords: ISM; abundances; molecules; submillimeter; Herschel observations; EXtra-Ordinary Sources; HEXOS; spectral surveys; Herschel/HIFI;
    Academic Unit: Faculty of Science and Engineering > Experimental Physics
    Item ID: 4018
    Depositing User: Dr. Anthony Murphy
    Date Deposited: 04 Dec 2012 16:19
    Journal or Publication Title: Astronomy & Astrophysics
    Publisher: EDP Sciences
    Refereed: Yes
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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