2010A&A...521L..20B

Query : 2010A&A...521L..20B

2010A&A...521L..20B - Astronomy and Astrophysics, volume 521, L20-20 (2010/10-1)

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

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 T., 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., MUELLER H.S.P., MURPHY J.A., NEUFELD D.A., OSSENKOPF V., PAGANI L., PEARSON J.C., PERAULT M., PLUME R., ROELFSEMA P., QIN S.-L., SALEZ M., SCHLEMMER S., STUTZKI J., TIELENS A.G.G.M., TRAPPE N., VAN DER TAK F.F.S., VASTEL C., YORKE H.W., YU S. and ZMUIDZINAS J.

Abstract (from CDS):

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 560GHz and from 1.06 to 1.115THz. 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 1THz 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.

Abstract Copyright: ∼

Journal keyword(s): ISM: abundances - ISM: molecules - submillimeter: ISM

Simbad objects: 8

Full paper

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Number of rows : 8

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Sp type	#ref 1850 - 2023	#notes
1	NAME Orion S	reg	05 35 12.9	-05 24 10	~	139	0
2	NAME OMC-1	MoC	05 35 14	-05 22.4	~	1148	2
3	NAME Orion-KL	SFR	05 35 14.16	-05 22 21.5	~	2251	1
4	NAME Orion Core	?	05 35 14.5	-05 22 30	~	196	0
5	NAME Orion Bright Bar	reg	05 35 22.30	-05 24 33.0	~	841	0
6	NAME Sgr B2 (North)	Rad	17 47 20.2	-28 22 21	~	646	1
7	NAME Sgr B2	MoC	17 47 20.4	-28 23 07	~	2198	1
8	NAME Sgr B2 Main	Rad	17 47 20.5	-28 23 06	~	390	1

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