J/ApJ/779/119 HCOOCH2D detection in Orion KL (Coudert+, 2013)
The first astrophysical detection, terahertz spectrum, and database for the
monodeuterated species of methyl formate HCOOCH2D.
Coudert L.H., Drouin B.J., Tercero B., Cernicharo J., Guillemin J.-C.,
Motiyenko R.A., Margules L.
<Astrophys. J., 779, 119 (2013)>
=2013ApJ...779..119C 2013ApJ...779..119C
ADC_Keywords: Atomic physics ; Line Profiles ; Interstellar medium ;
Spectra, millimetric/submm
Keywords: astronomical databases: miscellaneous; ISM: individual: Orion KL;
ISM: molecules; line: identification; methods: data analysis;
methods: laboratory: molecular; submillimeter: ISM
Abstract:
Based on new measurements carried out in the laboratory from 0.77 to
1.2THz and on a line-frequency analysis of these new data, along with
previously published data, we build a line list for HCOOCH2D that
leads to its first detection in the Orion KL nebula. The observed
lines, both in space and in the laboratory, involve the cis D-in-plane
and trans D-out-of-plane conformations of HCOOCH2D and the two
tunneling states arising from the large-amplitude motion connecting
the two trans configurations. The model used in the line position
calculation accounts for both cis and trans conformations, as well as
the large-amplitude motion.
Description:
The laboratory spectra measured in this work were recorded using the
Frequency Multiplied Submillimeter Spectrometer (FMSS) at the Jet
Propulsion Laboratory (JPL). The FMSS was scanned through the
0.77-0.85THz and 0.95-1.2THz ranges.
Five observing sessions (two in 2004 September, two in 2005 April, and
the last one in 2007 January) have been used to complete the line
survey toward the Orion KL nebula in all the frequency ranges
available with the IRAM 30m telescope. The 3.0, 2.0, and 1.3mm windows
(80-115.5GHz, 130-178GHz, and 197-281GHz, respectively) were observed
with 1MHz of spectral resolution. System temperatures were in the
range 100-800K from the lowest to the highest frequencies.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
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05 35 14.16 -05 22 21.5 NAME ORION-KL =NAME KL NEBULA
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 90 2822 Assignments, observed frequencies, and observed
minus calculated differences in the microwave
spectrum of HCOOCH2D
table7.dat 81 58231 Linelist for the microwave spectrum of HCOOCH2D
table9.dat 110 227 *Detected lines of HCOOCH2D towared Orion-KL
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Note on table9.dat: Emission lines of HCOOCH2D present in the spectral scan
of Orion KL from the IRAM 30m radio telescope.
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See also:
J/A+A/572/A44 : Vibrationally excited vinyl cyanide in Orion-KL (Lopez+, 2014)
J/ApJS/215/25 : Methyl formate (HCOOCH3) observations (Favre+, 2014)
J/ApJ/777/120 : cm to submm spectra of H2C=CH-CH2NC (Haykal+, 2013)
J/A+A/559/A51 : HC3N in Orion KL (Esplugues+, 2013)
J/ApJ/770/L13 : Detection of CH3COOCH3 in Orion (Tercero+, 2013)
J/ApJ/768/81 : Ethyl cyanide, CH3CH2CN, vibrational states (Daly+, 2013)
J/A+A/548/A71 : Spectroscopy and ISM detection of formamide (Motiyenko+, 2012)
J/A+A/543/A46 : Submillimeter spectrum of HCOOCD2H (Coudert+, 2012)
J/A+A/538/A119 : Spectrum of 18O-methyl formate (Tercero+ 2012)
J/A+A/532/A32 : HCOOCH3 map of Orion-KL (Favre+, 2011)
J/ApJ/714/1120 : Rotational spectrum and DCOOCH3 in Orion (Margules+, 2010)
J/A+A/500/1109 : Rotational spectrum of HCOO13CH3 (Carvajal+, 2009)
J/A+A/493/565 : Deuterated and 15N ethyl cyanides (Margules+, 2009)
J/A+A/466/255 : Isotopic ethyl cyanide (Demyk+, 2007)
J/ApJS/156/127 : 350µm molecular line survey of Orion KL (Comito+, 2005)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- J' [1/84] The J' rotational quantum level
4- 5 I2 --- K'a [0/41] The K'a rotational quantum level
7- 8 I2 --- K'c [0/84] The K'c rotational quantum level
10 A1 --- p' [±] The upper tunneling sublevel (G1)
13- 14 I2 --- J" [0/83] The J" rotational quantum level
16- 17 I2 --- K"a [0/41] The K"a rotational quantum level
19- 20 I2 --- K"c [0/83] The K"c rotational quantum level
22 A1 --- p" [±] The lower tunneling sublevel (G1)
26- 36 F11.3 MHz Freq [4232/1199060] Observed frequency
38- 41 I4 kHz e_Freq [3/1500] Uncertainty in Freq
45- 48 I4 kHz O-C [-724/678] Observed minus calculated residual
52 A1 --- Mult [DTQ] Multiplet code: D=Doublet, T=triplet,
Q=Quadruplet, blank=singlet
56- 90 A35 --- Ref Reference (This work or Margules et al.
2009JMoSp.254...55M 2009JMoSp.254...55M)
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 MHz Freq [845.5/1199990] Line frequency (1)
14- 20 F7.4 MHz e_Freq [0.01/13] Error in Freq (1)
22- 28 F7.4 [nm2.MHz] logInt [-8.5/-3.4] Log line intensity at 300K (1)
30 I1 --- DR [3] Degrees of freedom in rotational partition
function (3=nonlinear molecules) (1)
32- 40 F9.4 cm-1 Elo [0.8/1887] Lower level energy (1)
42- 44 I3 --- gup [5/161] Upper state degeneracy (1)
46- 51 I6 --- TAG [-61001/61001] Species tag or molecule
identifier, 61001 or -61001 (1)
53- 56 I4 --- QNFMT [1404] Format identifier of the quantum
numbers (1)
58- 59 I2 --- J' [2/80] The J' rotational quantum level
61- 62 I2 --- K'a [0/48] The K'a rotational quantum level
64- 65 I2 --- K'c [0/80] The K'c rotational quantum level
67 A1 --- p' [0-2] The upper tunneling sublevel (G1)
72- 73 I2 --- J" [1/80] The J" rotational quantum level
75- 76 I2 --- K"a [0/48] The K"a rotational quantum level
78- 79 I2 --- K"c [0/79] The K"c rotational quantum level
81 A1 --- p" [0-2] The lower tunneling sublevel (G1)
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Note (1): Detailed descriptions of the fields can be found
in Pickett et al. (1998JQSRT..60..883P 1998JQSRT..60..883P).
ELO is the lower state energy relative to the lowest energy
spin-rotation level in ground vibronic state.
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Byte-by-byte Description of file: table9.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- J' [6/26] The J' rotational quantum level
4- 5 I2 --- K'a [0/16] The K'a rotational quantum level
7- 8 I2 --- K'c [0/26] The K'c rotational quantum level
10 A1 --- p' [±] The upper tunneling sublevel (G1)
12- 13 I2 --- J" [5/25] The J" rotational quantum level
15- 16 I2 --- K"a [0/16] The K"a rotational quantum level
18- 19 I2 --- K"c [0/25]? The K"c rotational quantum level
21 A1 --- p" [±] The lower tunneling sublevel (G1)
23- 32 F10.3 MHz Flab [87631/276034] Predicted frequency in the
laboratory
34- 38 F5.3 MHz e_Flab [0.002/0.02] Flab uncertainty
40- 44 F5.1 K Eu [15.2/326] Upper level energy
46- 50 F5.2 D2 Sij [2.9/68.8] Line strength
52- 59 F8.1 MHz Fobs [87631/276034] Observed frequency assuming a
VLSR of 7.5km/s
60 A1 --- f_Fobs [d] d:line is blended with a previous line
62- 65 F4.1 km/s Vlsr [0.8/15.4] Observed radial velocity
67- 69 F3.1 km/s e_Vlsr [0.5/1.7] Vlsr uncertainty
71- 74 F4.2 K Tmb [0.02/0.8]? Upper limit of the main beam
temperature
76-110 A35 --- Blend Blended line identifier(s)
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Global notes:
Note (G1): For transitions of the D-out-of-plane conformation.
1 = - (D-out-of-plane conformation);
0 = + (D-out-of-plane conformation);
2 = blank (D-in-plane conformation).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 06-May-2015