2010A&A...518L.111O


Query : 2010A&A...518L.111O

2010A&A...518L.111O - Astronomy and Astrophysics, volume 518, L111-111 (2010/7-2)

Detection of interstellar oxidaniumyl: abundant H2O+ towards the star-forming regions DR 21, Sgr B2, and NGC 6334.

OSSENKOPF V., MUELLER H.S.P., LIS D.C., SCHILKE P., BELL T.A., BRUDERER S., BERGIN E., CECCARELLI C., COMITO C., STUTZKI J., BACMANN A., BAUDRY A., BENZ A.O., BENEDETTINI M., BERNE O., BLAKE G., BOOGERT A., BOTTINELLI S., BOULANGER F., CABRIT S., CASELLI P., CAUX E., CERNICHARO J., CODELLA C., COUTENS A., CRIMIER N., CROCKETT N.R., DANIEL F., DEMYK K., DIELEMAN P., DOMINIK C., DUBERNET M.L., EMPRECHTINGER M., ENCRENAZ P., FALGARONE E., FRANCE K., FUENTE A., GERIN M., GIESEN T.F., DI GIORGIO A.M., GOICOECHEA J.R., GOLDSMITH P.F., GUESTEN R., HARRIS A., HELMICH F., HERBST E., HILY-BLANT P., JACOBS K., JACQ T., JOBLIN C., JOHNSTONE D., KAHANE C., KAMA M., KLEIN T., KLOTZ A., KRAMER C., LANGER W., LEFLOCH B., LEINZ C., LORENZANI A., LORD S.D., MARET S., MARTIN P.G., MARTIN-PINTADO J., McCOEY C., MELCHIOR M., MELNICK G.J., MENTEN K.M., MOOKERJEA B., MORRIS P., MURPHY J.A., NEUFELD D.A., NISINI B., PACHECO S., PAGANI L., PARISE B., PEARSON J.C., PERAULT M., PHILLIPS T.G., PLUME R., QUIN S.-L., RIZZO R., ROELLIG M., SALEZ M., SARACENO P., SCHLEMMER S., SIMON R., SCHUSTER K., VAN DER TAK F.F.S., TIELENS A.G.G.M., TEYSSIER D., TRAPPE N., VASTEL C., VITI S., WAKELAM V., WALTERS A., WANG S., WHYBORN N., VAN DER WIEL M., YORKE H.W., YU S. and ZMUIDZINAS J.

Abstract (from CDS):

We identify a prominent absorption feature at 1115 GHz, detected in first HIFI spectra towards high-mass star-forming regions, and interpret its astrophysical origin. The characteristic hyperfine pattern of the H2O+ ground-state rotational transition, and the lack of other known low-energy transitions in this frequency range, identifies the feature as H2O+ absorption against the dust continuum background and allows us to derive the velocity profile of the absorbing gas. By comparing this velocity profile with velocity profiles of other tracers in the DR21 star-forming region, we constrain the frequency of the transition and the conditions for its formation. In DR21, the velocity distribution of H2O+ matches that of the [CII] line at 158µm and of OH cm-wave absorption, both stemming from the hot and dense clump surfaces facing the HII-region and dynamically affected by the blister outflow. Diffuse foreground gas dominates the absorption towards Sgr B2. The integrated intensity of the absorption line allows us to derive lower limits to the H2O+ column density of 7.2x1012cm–2 in NGC 6334, 2.3x1013cm–2 in DR21, and 1.1x1015cm–2 in Sgr B2.

Abstract Copyright:

Journal keyword(s): astrochemistry - line: identification - molecular data - ISM: abundances - ISM: molecules - ISM: clouds

Simbad objects: 8

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Number of rows : 8
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 NAME W3 IRS 5 Y*O 02 25 40.54 +62 05 51.4           B1 342 0
2 NGC 6334 HII 17 20 53 -36 07.9           ~ 646 0
3 NAME NGC 6334-I Cl* 17 20 53.35 -35 47 01.5           ~ 311 0
4 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2122 1
5 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 374 1
6 W 31c HII 18 10 29.1 -19 56 05           ~ 322 0
7 RAFGL 2591 Y*O 20 29 24.8230 +40 11 19.590           ~ 601 0
8 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 1009 0

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2022.09.26-02:47:16

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