2003A&A...402L..47O


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST23:58:34

2003A&A...402L..47O - Astronomy and Astrophysics, volume 402, L47-54 (2003/5-2)

Odin water mapping in the Orion KL region.

OLOFSSON A.O.H., OLOFSSON G., HJALMARSON A., BERGMAN P., BLACK J.H., BOOTH R.S., BUAT V., CURRY C.L., ENCRENAZ P.J., FALGARONE E., FELDMAN P., FICH M., FLOREN H.-G., FRISK U., GERIN M., GREGERSEN E.M., HARJU J., HASEGAWA T., JOHANSSON L.E.B., KWOK S., LARSSON B., LECACHEUX A., LILJESTROEM T., LISEAU R., MATTILA K., MITCHELL G.F., NORDH H.L., OLBERG M., OLOFSSON H., PAGANI L., PLUME R., RISTORCELLI I., RYDBECK G., SANDQVIST A., VON SCHEELE F., SERRA G., TOTHILL N.F.H., VOLK K. and WILSON C.D.

Abstract (from CDS):

New results from water mapping observations of the Orion KL region using the submm/mm wave satellite Odin (2.1' beam size at 557GHz), are presented. The ortho-H2O J(K+K-)=1(1,0)->1(0,1) ground state transition was observed in a 7'x7' rectangular grid with a spacing of 1', while the same line of H218O was measured in two positions, Orion KL itself and 2' south of Orion KL. In the main water species, the KL molecular outflow is largely resolved from the ambient cloud and it is found to have an extension of 60"-110". The H2O outflow profile exhibits a rather striking absorption-like asymmetry at the line centre. Self-absorption in the near (or ``blue'') part of the outflow (and possibly in foreground quiescent halo gas) is tentatively suggested to play a role here. We argue that the dominant part of the KL H218O outflow emission emanates from the compact (size ∼15") low-velocity flow and here estimate an H2O abundance of circa 10–5 compared to all H2 in the flow - an order of magnitude below earlier estimates of the H2O abundance in the shocked gas of the high-velocity flow. The narrow ambient cloud lines show weak velocity trends, both in the N-S and E-W directions. H218O is detected for the first time in the southern position at a level of ∼0.15K and we here estimate an H2O abundance of (1-8)x10–8.

Abstract Copyright:

Journal keyword(s): ISM: abundances - ISM: individual objects: Orion KL - ISM: molecules - submillimeter

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 - 2020
#notes
1 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1015 2
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2001 1
3 M 42 HII 05 35 17.3 -05 23 28           ~ 3724 0
4 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 716 0
5 NAME Ori A MoC 05 38 -07.1           ~ 2675 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-23:58:34

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