2020A&A...638A...3M


Query : 2020A&A...638A...3M

2020A&A...638A...3M - Astronomy and Astrophysics, volume 638A, 3-3 (2020/6-1)

Millimeter wave spectroscopy of cyanoketene (NC-CH=C=O) and an observational search in the ISM.

MARGULES L., McGUIRE B.A., MOTIYENKO R.A., BROGAN C., HUNTER T., REMIJAN A. and GUILLEMIN J.C.

Abstract (from CDS):


Context. Ketene was detected in the interstellar medium (ISM) in 1977. Until now, only one derivative, the ketenyl radical, has been observed in this medium. Due to its large dipole moment value, cynaoketene is one of the best candidates for possible ketene derivative detection.
Aims. To date, the measurements of the rotational spectra have been limited to 60GHz. The extrapolation of the prediction in the millimeter wave domain is inaccurate and does not permit an unambiguous detection.
Methods. The rotational spectra were re-investigated up to 330GHz. Using the new prediction cyanoketene was sought after in a variety of astronomical sources: NGS 63341, SgrB2(N), and ASAI sources.
Results. A total of 1594 transitions were newly assigned and fitted together with those from previous studies, reaching quantum numbers up to J=82 and Ka=24. Watson's asymmetric top Hamiltonian in the Ir representation was used for the analysis; both reductions A and S were tested. Logically, the S reduction gave the best results confirming that the molecule is very close to the prolate limit. Cynaoketene was not found in ISM; upper limits to the column density were derived in each source.

Abstract Copyright: © L. Margulès et al. 2020

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

VizieR on-line data: <Available at CDS (J/A+A/638/A3): s1.dat s2.lin s3.par s4.cat>

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 IRAS 03222+3034 Y*O 03 25 22.32 +30 45 13.9           ~ 141 0
2 [HSW2018] NGC 1333-17 smm 03 29 03.73 +31 16 03.8           ~ 87 0
3 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 696 1
4 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 317 0
5 LDN 1527 DNe 04 39 53 +25 45.0           ~ 606 0
6 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1620 0
7 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 832 0
8 NAME NGC 6334-I Cl* 17 20 53.35 -35 47 01.5           ~ 333 0
9 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 646 1
10 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2199 1
11 NAME LDN 1157-mm Y*O 20 39 06.2 +68 02 15           ~ 180 0
12 [DE95] LDN 1157 B1 out 20 39 11 +68 01.3           ~ 237 0

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2023.09.28-13:53:21

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