2018A&A...619A..92B


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.13CET06:47:43

2018A&A...619A..92B - Astronomy and Astrophysics, volume 619A, 92-92 (2018/11-1)

The millimeter-wave spectrum of methyl ketene and the astronomical search for it.

BERMUDEZ C., TERCERO B., MOTIYENKO R.A., MARGULES L., CERNICHARO J., ELLINGER Y. and GUILLEMIN J.-C.

Abstract (from CDS):


Context. The analysis of isomeric species of a compound observed in the interstellar medium (ISM) is a useful tool to understand the chemistry of complex organic molecules. It could, likewise, assist in the detection of new species.
Aims. Our goal consists in analyzing one of the two most stable species of the C3H4O family, methyl ketene, whose actual rotational parameters are not precise enough to allow its detection in the ISM. The obtained parameters will be used to search for it in the high-mass star-forming regions Orion KL and Sagittarius B2, as well as in the cold dark clouds TMC-1 in the Taurus Molecular Cloud and Barnard 1 (B1-b).
Methods. A millimeter-wave room-temperature rotational spectrum of methyl ketene was recorded from 50 to 330GHz. The internal rotation analysis of its ground state and first torsional excited state was performed with the rho-axis method employing the RAM36 program.
Results. More than 3000 transitions of the rotational spectrum of the ground state (Kamax=18) and first torsional excited state (Kamax=13) of methyl ketene were fitted using a Hamiltonian that contains 41 parameters with a root mean square of 44kHz. Column density limits were calculated but no lines were detected in the ISM belonging to methyl ketene.

Abstract Copyright: © ESO 2018

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

VizieR on-line data: <Available at CDS (J/A+A/619/A92): table3.dat table4.dat>

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
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 Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3336 0
4 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1330 0
5 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 1948 1
6 W 23 Rad 17 34 -32.6           ~ 11 1
7 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11087 0
8 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 500 1
9 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1860 1

    Equat.    Gal    SGal    Ecl

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2019.12.13-06:47:43

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