J/ApJS/156/127 350µm molecular line survey of Orion KL (Comito+, 2005)
A molecular line survey of Orion KL in the 350 micron band.
Comito C., Schilke P., Phillips T.G., Lis D.C., Motte F., Mehringer D.
<Astrophys. J. Suppl. Ser., 156, 127-167 (2005)>
=2005ApJS..156..127C 2005ApJS..156..127C
ADC_Keywords: Interstellar medium ; Molecular clouds ;
Spectra, millimetric/submm
Keywords: ISM: abundances - ISM: individual (Orion) - ISM: molecules -
line: formation - line: identification - submillimeter
Abstract:
With the Caltech Submillimeter Observatory, we have carried out an
unbiased spectral line survey of Orion KL throughout the 350µm band
(from 795 to 903GHz). This is the first systematic study of molecular
radiation in this frequency range. A total of 541 features, resulting
from 929 transitions from a total of 26 species, have been detected.
High-excitation transitions from CH3OH, CH3CN, H2CO, HNCO, and
C2H5CN indicate the presence of a very hot (∼250K) component at
the systemic velocity characteristic of the Hot Core. Physical
parameters (column density and rotational temperature) relative to a
number of species have been estimated by fitting, in the LTE (Local
Thermodynamic Equilibrium) approximation, the whole 100GHz spectrum at
once, thus taking line blending and optical depth effects properly
into account. We also report the tentative detection, for the first
time outside the Galactic center region, of the radical NH2, one of
the building blocks of the chemistry of ammonia.
Description:
We surveyed the 350µm molecular emission of the HC (B1950 position=
05 32 46 -05 24 24.0) with the Caltech Submillimeter Observatory (CSO)
located atop Mauna Kea, Hawaii.
Objects:
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RA (2000) DE Designation(s)
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05 35 14.2 -05 22 22 Orion KL = BNKL 1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 22 834 List of identified features
table4.dat 78 13 Observed transitions from atoms and
diatomic molecules
table5.dat 78 12 Observed Transitions from polyatomic molecules
table6.dat 78 17 Observed transitions from SO and isotopomers
table7.dat 80 25 NO and NS molecules
table8.dat 80 9 Observed transitions from CH3CN
table9.dat 80 84 Observed transitions from SO2 and isotopomers
table10.dat 78 12 Observed transitions from HDO, H2S, NH2D,
and NH2
table11.dat 80 298 Observed transitions from CH3OH and isotopomers
table12.dat 80 29 Observed transitions from H2CO and isotopomers
table13.dat 80 74 Observed transitions from HNCO
table14.dat 80 17 Observed transitions from HCOOCH3
table15.dat 80 128 Observed transitions from CH3OCH3
table16.dat 80 72 Ons from C2H5CN
table17.dat 78 57 Table of U-lines (unknown lines)
notes.dat 86 120 Notes
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 F8.1 MHz Freq Frequency
10- 22 A13 --- Mol Molecule feature identification (U means unknown)
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Byte-by-byte Description of file: table[4-9].dat table1?.dat
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Bytes Format Units Label Explanations
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1- 20 A20 --- Mol The molecule description
22- 29 F8.1 MHz Freq Frequency
31- 59 A29 --- Trans Transition (J,Km,Kp)
61- 65 F5.1 K Temp Main-beam temperature
67- 73 F7.1 K.km/s Int Integrated intensity
75- 78 I4 --- Note ? Additional note detailed in notes.dat
80 A1 --- Blend [b] Flag for blended lines on Freq (1)
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Note (1): A "b" means that the same intensities and integrated intensities
indicate each row is part of a blend at that frequency.
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Note Note number
6- 91 A86 --- Text Text of Note
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 05-Jul-2005