CDS

2010A&A...521L..47G

Query : 2010A&A...521L..47G

2010A&A...521L..47G - Astronomy and Astrophysics, volume 521, L47-47 (2010/10-1)

Detection of OH+ and H2O+ towards Orion KL.

GUPTA H., RIMMER P., PEARSON J.C., YU S., HERBST E., HARADA N., BERGIN E.A., NEUFELD D.A., MELNICK G.J., BACHILLER R., BAECHTOLD W., BELL T.A., BLAKE G.A., CAUX E., CECCARELLI C., CERNICHARO J., CHATTOPADHYAY G., COMITO C., CABRIT S., CROCKETT N.R., DANIEL F., FALGARONE E., DIEZ-GONZALEZ M.C., DUBERNET M.-L., ERICKSON N., EMPRECHTINGER M., ENCRENAZ P., GERIN M., GILL J.J., GIESEN T.F., GOICOECHEA J.R., GOLDSMITH P.F., JOBLIN C., JOHNSTONE D., LANGER W.D., LARSSON B., LATTER W.B., LIN R.H., LIS D.C., LISEAU R., LORD S.D., MAIWALD F.W., MARET S., MARTIN P.G., MARTIN-PINTADO J., MENTEN K.M., MORRIS P., MUELLER H.S.P., MURPHY J.A., NORDH L.H., OLBERG M., OSSENKOPF V., PAGANI L., PERAULT M., PHILLIPS T.G., PLUME R., QIN S.-L., SALEZ M., SAMOSKA L.A., SCHILKE P., SCHLECHT E., SCHLEMMER S., SZCZERBA R., STUTZKI J., TRAPPE N., VAN DER TAK F.F.S., VASTEL C., WANG S., YORKE H.W., ZMUIDZINAS J., BOOGERT A., GUESTEN R., HARTOGH P., HONINGH N., KARPOV A., KOOI J., KRIEG J.-M., SCHIEDER R. and ZAAL P.

Abstract (from CDS):

We report observations of the reactive molecular ions OH+, H2O+, and H3O+ towards Orion KL with Herschel/HIFI. All three N=1-0 fine-structure transitions of OH+ at 909, 971, and 1033GHz and both fine-structure components of the doublet ortho-H2O+ 111-000 transition at 1115 and 1139GHz were detected; an upper limit was obtained for H3O+. OH+ and H2O+ are observed purely in absorption, showing a narrow component at the source velocity of 9km/s, and a broad blueshifted absorption similar to that reported recently for HF and para-H218O, and attributed to the low velocity outflow of Orion KL. We estimate column densities of OH+ and H2O+ for the 9km/s component of 9±3x1012cm–2 and 7±2x1012cm–2, and those in the outflow of 1.9±0.7x1013cm–2 and 1.0±0.3x1013cm–2. Upper limits of 2.4x1012cm–2 and 8.7x1012cm–2 were derived for the column densities of ortho and para-H3O+ from transitions near 985 and 1657GHz. The column densities of the three ions are up to an order of magnitude lower than those obtained from recent observations of W31C and W49N. The comparatively low column densities may be explained by a higher gas density despite the assumption of a very high ionization rate.

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Journal keyword(s): astrochemistry - molecular processes - line: identification - ISM: abundances - submillimeter: ISM - stars: winds, outflows

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023 		#notes
1 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2251 1
2 M 42 HII 05 35 17 -05 23.4           ~ 4024 0
3 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 841 0
4 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 390 1
5 W 31c HII 18 10 29.1 -19 56 05           ~ 336 0
6 W 49n HII 19 10 13.2 +09 06 12           ~ 461 3
7 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1036 0

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2023.09.24-12:08:58

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