C.D.S. - SIMBAD4 rel 1.7 - 2019.12.06CET18:47:34

2018A&A...619A..67K - Astronomy and Astrophysics, volume 619A, 67-67 (2018/11-1)

Laboratory rotational spectrum and astronomical search for methoxyacetaldehyde.


Abstract (from CDS):

Context. Methoxyacetaldehyde belongs to a group of structural isomers with the general formula C3H6O2, of which methyl acetate and ethyl formate are known interstellar molecules. Rotational data available for methoxyacetaldehyde are limited to 40GHz, which makes predictions at higher frequencies rather uncertain.
Aims. The aim of this work is to provide accurate experimental frequencies of methoxyacetaldehyde in the millimeter-wave region to support its detection in the interstellar medium.
Methods. The rotational spectrum of methoxyacetaldehyde was recorded at room-temperature from 75 to 120GHz and from 170 to 310GHz using the millimeter-wave spectrometer in Valladolid. Additional measurements were also performed at conditions of supersonic expansion from 6 to 18GHz. The assigned rotational transitions were analyzed using the S -reduced semirigid-rotor Hamiltonian.
Results. We newly assigned over 1000 lines for the most stable conformer of methoxyacetaldehyde in its ground state and five lowest excited vibrational states, and precise sets of spectroscopic constants were obtained. We searched for spectral features of methoxyacetaldehyde in the high-mass star-forming regions Orion KL and Sagittarius B2, as well as in the cold dark cloud Barnard 1 (B1-b). No lines belonging to methoxyacetaldehyde were detected above the detection limit of our data. We provide upper limits to the methoxyacetaldehyde colum density in these sources.

Abstract Copyright: © ESO 2018

Journal keyword(s): astrochemistry - ISM: molecules - line: identification - astronomical databases: miscellaneous

VizieR on-line data: <Available at CDS (J/A+A/619/A67): table4.dat>

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 248 0
2 [HKM99] B1-b cor 03 33 20.32 +31 07 21.5           ~ 150 0
3 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 1948 1
4 NAME Sgr B1 MoC 17 47 02.0 -28 31 57           ~ 121 0
5 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 500 1
6 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1860 1

    Equat.    Gal    SGal    Ecl

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