2007A&A...476..791O


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET20:54:51

2007A&A...476..791O - Astronomy and Astrophysics, volume 476, 791-806 (2007/12-3)

A spectral line survey of Orion KL in the bands 486-492 and 541-577 GHz with the Odin satellite. I. The observational data.

OLOFSSON A.O.H., PERSSON C.M., KONING N., BERGMAN P., BERNATH P.F., BLACK J.H., FRISK U., GEPPERT W., HASEGAWA T.I., HJALMARSON A., KWOK S., LARSSON B., LECACHEUX A., NUMMELIN A., OLBERG M., SANDQVIST A. and WIRSTROEM E.S.

Abstract (from CDS):

Spectral line surveys are useful since they allow identification of new molecules and new lines in uniformly calibrated data sets. The subsequent multi-transition analysis will provide improved knowledge of molecular abundances, cloud temperatures and densities, and may also reveal previously unsuspected blends of molecular lines, which otherwise may lead to erroneous conclusions. Nonetheless, large portions of the sub-millimetre spectral regime remain unexplored due to severe absorptions by H2O and O2 in the terrestrial atmosphere. The purpose of the measurements presented here is to cover wavelength regions at and around 0.55mm - regions largely unobservable from the ground. Using the Odin astronomy/aeronomy satellite, we performed the first spectral survey of the Orion KL molecular cloud core in the bands 486-492 and 541-576GHz with rather uniform sensitivity (22-25mK baseline noise). Odin's 1.1m size telescope, equipped with four cryo-cooled tuneable mixers connected to broad band spectrometers, was used in a satellite position-switching mode. Two mixers simultaneously observed different 1.1GHz bands using frequency steps of 0.5GHz (25h each). An on-source integration time of 20h was achieved for most bands. The entire campaign consumed ∼1100 orbits, each containing one hour of serviceable astro-observation. We identified 280 spectral lines from 38 known interstellar molecules (including isotopologues) having intensities in the range 80 to 0.05K. An additional 64 weak lines remain unidentified. Apart from the ground state rotational 11,0-10,1 transitions of ortho-H2O, H218O and H217O, the high energy 62,4-71,7 line of para-H2O (Eu=867K) and the HDO(20,2-11,1) line have been observed, as well as the 10-01 lines from NH3 and its rare isotopologue 15NH3. We suggest assignments for some unidentified features, notably the new interstellar molecules ND and SH. Severe blends have been detected in the line wings of the H218O, H217O and 13CO lines changing the true linewidths of the outflow emission.

Abstract Copyright:

Journal keyword(s): ISM: individual objects: Orion KL - ISM: lines and bands - ISM: molecules - line: identification - submillimeter - surveys

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 - 2021
#notes
1 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2048 1
2 NAME Orion Core ? 05 35 14.5 -05 22 30           ~ 177 0
3 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 590 1
4 M 42 HII 05 35 17.3 -05 23 28           ~ 3774 0
5 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1978 1

    Equat.    Gal    SGal    Ecl

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