J/ApJS/158/188 Detection of glycolaldehyde toward Sgr B2 (Widicus+, 2005)
Millimeter-wave and vibrational state assignments for the rotational spectrum of
glycolaldehyde.
Widicus Weaver S.L., Butler R.A.H., Drouin B.J., Petkie D.T., Dyl K.A.,
De Lucia F.C., Blake G.A.
<Astrophys. J. Suppl. Ser., 158, 188-192 (2005)>
=2005ApJS..158..188W 2005ApJS..158..188W
ADC_Keywords: Interstellar medium ; Spectra, millimetric/submm
Keywords: ISM: molecules - methods: data analysis - methods: laboratory -
molecular data - radio lines: ISM
Abstract:
Glycolaldehyde (CHOCH2OH), the simplest two-carbon α-hydroxy
aldehyde, has become of great interest in the field of astrochemistry
due to its recent detection toward the Sagittarius B2 (N-LMH)
molecular cloud. The original interstellar identification was based on
an extrapolation of prior microwave rotational spectroscopy of
glycolaldehyde. The millimeter and submillimeter spectra of this
molecule from 128 to 354GHz were subsequently measured after the
interstellar detection. We present here the millimeter spectrum of
this molecule from 72 to 122.5GHz along with a combined millimeter and
submillimeter pure rotational analysis of the ground and the first
three vibrationally excited states of glycolaldehyde that enables a
more complete molecular partition function to be determined.
Description:
The millimeter and submillimeter spectra of glycolaldehyde from 128 to
354GHz were obtained with the Fast Scanning Submillimeter
Spectroscopic Technique (FASSST) system at the Ohio State University.
Additional millimeter studies from 72 to 122.5GHz were conducted with
the millimeter and submillimeter spectrometer at the Jet Propulsion
Laboratory.
Objects:
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RA (2000) DE Designation(s)
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17 47 20.4 -28 23 07 Sagittarius B2 = SNR 000.7+00.0
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 84 3160 Assigned transitions for the ground and first three
vibrationally excited states of glycolaldehyde
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See also:
J/ApJS/117/427 : Sgr B2 spectral survey (Nummelin+, 1998)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- J' The upper J quantum number
5- 6 I2 --- Ka' The upper Ka quantum number
9- 10 I2 --- Kc' The upper Kc quantum number
13- 14 I2 --- v' The upper v quantum number
17- 18 I2 --- J" The lower J quantum number
21- 22 I2 --- Ka" The lower Ka quantum number
25- 26 I2 --- Kc" The lower Kc quantum number
29- 30 I2 --- v" The lower v quantum number
45- 56 F12.5 MHz Freq The frequency of the transition
62- 69 F8.5 MHz O-C The observed minus calculated value
74- 80 F7.5 MHz e_O-C The experimental uncertainty in O-C
84 A1 --- Blend [B] Signifies blend (1)
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Note (1): A "B" marks components of an unresolved blend of lines
with different quantum numbers.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 07-Dec-2005