2010A&A...518L.110G


Query : 2010A&A...518L.110G

2010A&A...518L.110G - Astronomy and Astrophysics, volume 518, L110-110 (2010/7-2)

Interstellar OH+, H2O+ and H3O+ along the sight-line to G10.6-0.4.

GERIN M., DE LUCA M., BLACK J., GOICOECHEA J.R., HERBST E., NEUFELD D.A., FALGARONE E., GODARD B., PEARSON J.C., LIS D.C., PHILLIPS T.G., BELL T.A., SONNENTRUCKER P., BOULANGER F., CERNICHARO J., COUTENS A., DARTOIS E., ENCRENAZ P., GIESEN T., GOLDSMITH P.F., GUPTA H., GRY C., HENNEBELLE P., HILY-BLANT P., JOBLIN C., KAZMIERCZAK M., KOLOS R., KRELOWSKI J., MARTIN-PINTADO J., MONJE R., MOOKERJEA B., PERAULT M., PERSSON C., PLUME R., RIMMER P.B., SALEZ M., SCHMIDT M., STUTZKI J., TEYSSIER D., VASTEL C., YU S., CONTURSI A., MENTEN K., GEBALLE T., SCHLEMMER S., SHIPMAN R., TIELENS A.G.G.M., PHILIPP-MAY S., CROS A., ZMUIDZINAS J., SAMOSKA L.A., KLEIN K. and LORENZANI A.

Abstract (from CDS):

We report the detection of absorption lines by the reactive ions OH+, H2O+and H3O+ along the line of sight to the submillimeter continuum source G10.6-0.4 (W31C). We used the Herschel HIFI instrument in dual beam switch mode to observe the ground state rotational transitions of OH+ at 971GHz, H2O+ at 1115 and 607GHz, and H3O+ at 984GHz. The resultant spectra show deep absorption over a broad velocity range that originates in the interstellar matter along the line of sight to G10.6-0.4 as well as in the molecular gas directly associated with that source. The OH+ spectrum reaches saturation over most velocities corresponding to the foreground gas, while the opacity of the H2O+ lines remains lower than 1 in the same velocity range, and the H3O+line shows only weak absorption. For LSR velocities between 7 and 50km/s we estimate total column densities of N(OH+)≥2.5x1014cm–2, N(H2O+)∼6x1013cm–2 and N(H3O+)∼4.0x1013cm–2. These detections confirm the role of O+ and OH+ in initiating the oxygen chemistry in diffuse molecular gas and strengthen our understanding of the gas phase production of water. The high ratio of the OH+ by the H2O+ column density implies that these species predominantly trace low-density gas with a small fraction of hydrogen in molecular form.

Abstract Copyright:

Journal keyword(s): ISM: general - ISM: molecules - ISM: clouds

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 6334 HII 17 20 53 -36 07.9           ~ 646 0
2 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2122 1
3 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 374 1
4 W 31c HII 18 10 29.1 -19 56 05           ~ 322 0
5 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 1010 0

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2022.10.02-02:24:07

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