2009A&A...493..565M


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.08CET20:44:39

2009A&A...493..565M - Astronomy and Astrophysics, volume 493, 565-569 (2009/1-2)

Rotational spectrum of deuterated and 15N ethyl cyanides: CH3CHDCN and CH2DCH2CN and of CH3CH2C15N.

MARGULES L., MOTIYENKO R., DEMYK K., TERCERO B., CERNICHARO J., SHENG M., WEIDMANN M., GRIPP J., MAEDER H. and DEMAISON J.

Abstract (from CDS):

Ethyl cyanide is an abundant molecule in hot molecular clouds. Its rotational spectrum is very dense and several hundreds of rotational transitions within the ground state have been identified in molecular clouds in the 40-900GHz frequency range. Lines from 13C isotopically substituted ethyl cyanide were identified in Orion. To enable the search and the possible detection of other isotopologues of ethyl cyanide in interstellar objects, we have studied the rotational spectrum of deuterated ethyl cyanide: CH2DCH2CN (in-plane and out-of-plane) and CH3CHDCN and the spectrum of 15N substituted ethyl cyanide CH3CH2C15N. Using these experimental data, we have searched for these species in Orion. The rotational spectrum of each species in the ground state was measured in the microwave and millimeter-submillimeter wavelength range using a waveguide Fourier Transform spectrometer (8-17GHz) and a source-modulated spectrometer employing backward-wave oscillators (BWOs) (150-260 and 580-660 GHz). More than 300 lines were identified for each species, for J values in the range 71-80 and Ka values in the range 28-31 depending on the isotopologues. The experimental spectra were analyzed using a Watson's Hamiltonian in the A-reduction. From the fitting procedure, accurate spectroscopic constants were derived for each of the species. These new sets of spectroscopic constants enable us to predict reliably the rotational spectrum (lines frequencies and intensities) in the 4-1000 GHz frequency range and for J and Ka up to 80 and 31, respectively. Combined with IRAM 30m antenna observations of Orion, this experimental study allowed us to detect 15N substituted ethyl cyanide CH3CH2C15N for the first time in Orion. The derived column density and rotational temperature are 1013cm–2 and 150K for the plateau and 3x1014cm–2 and 300K for the hot core. The deuterated species were searched for but were not detected. The upper limit to the column density of each deuterated isotopologues was 1014cm–2.

Abstract Copyright:

Journal keyword(s): line: identification - methods: laboratory - molecular data - ISM: molecules - radio lines: ISM - submillimeter

VizieR on-line data: <Available at CDS (J/A+A/493/565): table7.dat table8.dat table9.dat table10.dat>

Simbad objects: 7

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Number of rows : 7

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 QSO B0420-0127 QSO 04 23 15.80072776 -01 20 33.0654034   17.50 17.00 16.28   ~ 1084 3
2 QSO J0530+13 Bla 05 30 56.41672 +13 31 55.1495     20.0 19.35   ~ 893 1
3 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 590 1
4 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 500 0
5 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1981 1
6 W 51e2 Rad 19 23 43.90 +14 30 34.8           ~ 187 0
7 W 51 SNR 19 23 50 +14 06.0           ~ 1174 1

    Equat.    Gal    SGal    Ecl

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2021.03.08-20:44:39

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