Odin water mapping in the Orion KL region
Artikel i vetenskaplig tidskrift, 2003

New results from water mapping observations of the Orion KL region using the submm/mm wave satellite Odin (2.1′ beam size at 557 GHz), are presented. The ortho-H2O JK(+)K(-) = l1.0 → l0.1 ground state transition was observed in a 7′ × 7′ 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 ∼0.15 K and we here estimate an H2O abundance of (1-8) × 10-8.

ISM: abundances

ISM: individual objects: Orion KL

ISM: molecules

Submillimeter

Författare

Henrik Olofsson

Onsala rymdobservatorium

G. Olofsson

Stockholms observatorium

Åke Hjalmarson

Chalmers, Onsala Rymdobservatorium

Per Bergman

Chalmers, Onsala Rymdobservatorium

John H Black

Chalmers, Onsala Rymdobservatorium

Roy Booth

Chalmers, Onsala Rymdobservatorium

V. Buat

C.L. Curry

University of Waterloo

P. J. Encrenaz

Observatoire de Paris

E. Falgarone

Ecole Normale Superieure (ENS)

P. Feldman

M. Fich

University of Waterloo

H. G. Floren

Stockholms observatorium

U. Frisk

Swedish Space Corporation (SSC)

M. Gerin

Ecole Normale Superieure (ENS)

E.M. Gregersen

McMaster University

J. Harju

Helsingin Yliopisto

T. Hasegawa

University of Calgary

Lars E B Johansson

Chalmers, Onsala Rymdobservatorium

S. Kwok

University of Calgary

B. Larsson

Stockholms observatorium

A. Lecacheux

Observatoire de Paris-Meudon

T Liljeström

René Liseau

Stockholms observatorium

K. Mattila

Helsingin Yliopisto

G.F. Mitchell

Saint Mary's University

H. L. Nordh

Rymdstyrelsen

Michael Olberg

Chalmers, Onsala Rymdobservatorium

H. Olofsson

Stockholms observatorium

L. Pagani

Observatoire de Paris

R. Plume

University of Calgary

I. Ristorcelli

Gustaf Rydbeck

Chalmers, Onsala Rymdobservatorium

Aa. Sandqvist

Stockholms observatorium

F. von Scheele

Swedish Space Corporation (SSC)

G. Serra

N.F. Tothill

Saint Mary's University

K. Volk

University of Calgary

C. D. Wilson

McMaster University

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 402 3 L47-L54

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

Infrastruktur

Onsala rymdobservatorium

DOI

10.1051/0004-6361:20030339

Mer information

Senast uppdaterat

2022-03-18