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

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Bergin, E.A., Phillips , T.G., Comito, C., Crockett, N.R., Lis, D.C., Schilke, P., Wang, S., Bell, T.A., Blake, G.A., Bumble, B., Caux, E., Cabrit, S., Ceccarelli, C., Cernicharo, J., Daniel, F., de Graauw, Th., Dubernet, M.-L., Emprechtinger, M., Encrenaz, P., Falgarone, E., Gerin, M., Giesen, T.F., Goicoechea, J.R., Goldsmith, P.F., Gupta, H., Hartogh, P., Helmich, F.P., Herbst, E., Joblin, C., Johnstone, D., Kawamura, J.H., Langer, W.D., Latter, W.B., Lord, S.D., Maret, S., Martin, P.G., Melnick, G.J., Menten, K.M., Morris, P., Muller, H.S.P., Murphy, J.Anthony, Neufeld, D.A., Ossenkopf, V., Pagani, L., Pearson, J.C., Perault, M., Plume, R., Qin, S.-L., Roelfsema, P., Salez, M., Schlemmer, S., Stutzki, J., Tielens, A.G.G.M., Trappe, Neil, van der Tak, F.F.S., Vastel, C., Yorke, H.W., 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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Abstract

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
Related URLs:	http://www.aanda.org/ http://publications.edpsciences.org/
URI:	https://mural.maynoothuniversity.ie/id/eprint/4018
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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Herschel observations of EXtra-Ordinary Sources (HEXOS): The present and future of spectral surveys with Herschel/HIFI

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