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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 Lis, D. C. and Bell, T. A. and Blake, G. A. and Emprechtinger, M. and Latter, W. B. and Morris, P. and Lord, S. D. and Zmuidzinas, J. (2010) Herschel observations of EXtra-Ordinary Sources (HEXOS): The present and future of spectral surveys with Herschel/HIFI. Astronomy and Astrophysics, 521 . Art. No. L20. ISSN 0004-6361. doi:10.1051/0004-6361/201015071.

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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 HD^(18)O 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/H_2O ~ 0.02. We discuss the implications of this detection for the water D/H ratio in hot cores.

Item Type:Article
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Bergin, E. A.0000-0003-4179-6394
Lis, D. C.0000-0002-0500-4700
Blake, G. A.0000-0003-0787-1610
Additional Information:© 2010 ESO. Received 28 May 2010, Accepted 30 June 2010, Published online 01 October 2010. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. Figure 2 (page 6) is also available in electronic form at HIFI has been designed and built by a consortium of institutes and university departments from across Europe, Canada, and the United States under the leadership of SRON Netherlands Institute for Space Research, Groningen, The Netherlands, and with major contributions from Germany, France, and the US. Consortium members are: Canada: CSA, U. Waterloo; France: CESR, LAB, LERMA, IRAM; Germany: KOSMA, MPIfR, MPS; Ireland, NUI Maynooth; Italy: ASI, IFSI-INAF, Osservatorio Astrofisico di Arcetri – INAF; Netherlands: SRON, TUD; Poland: CAMK, CBK; Spain: Observatorio AstronŮmico Nacional (IGN), Centro de AstrobiologŠa (CSIC-INTA). Sweden: Chalmers University of Technology – MC2, RSS & GARD; Onsala Space Observatory; Swedish National Space Board, Stockholm University – Stockholm Observatory; Switzerland: ETH Zurich, FHNW; USA: Caltech, JPL, NHSC. The HEXOS team also is grateful to the HIFI instrument team for building a fantastic instrument. Support for this work was provided by NASA through an award issued by JPL/Caltech.
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Subject Keywords:ISM: abundances – ISM: molecules – submillimeter: ISM
Record Number:CaltechAUTHORS:20101220-151918853
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Official Citation:Herschel observations of EXtra-Ordinary Sources (HEXOS): The present and future of spectral surveys with Herschel/HIFI E. A. Bergin, T. G. Phillips, C. Comito, N. R. Crockett, D. C. Lis, P. Schilke, S. Wang, T. A. Bell, G. A. Blake, B. Bumble, E. Caux, S. Cabrit, C. Ceccarelli, J. Cernicharo, F. Daniel, Th. de Graauw, M.-L. Dubernet, M. Emprechtinger, P. Encrenaz, E. Falgarone, M. Gerin, T. F. Giesen, J. R. Goicoechea, P. F. Goldsmith, H. Gupta, P. Hartogh, F. P. Helmich, E. Herbst, C. Joblin, D. Johnstone, J. H. Kawamura, W. D. Langer, W. B. Latter, S. D. Lord, S. Maret, P. G. Martin, G. J. Melnick, K. M. Menten, P. Morris, H. S. P. Müller, J. A. Murphy, D. A. Neufeld, V. Ossenkopf, L. Pagani, J. C. Pearson, M. Pérault, R. Plume, P. Roelfsema, S.-L. Qin, M. Salez, S. Schlemmer, J. Stutzki, A. G. G. M. Tielens, N. Trappe, F. F. S. van der Tak, C. Vastel, H. W. Yorke, S. Yu and J. Zmuidzinas A&A 521 L20 (2010) DOI: 10.1051/0004-6361/201015071
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21457
Deposited By: Benjamin Perez
Deposited On:20 Dec 2010 23:47
Last Modified:09 Nov 2021 15:57

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