2020A&A...640A..98B


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.26CET13:53:31

2020A&A...640A..98B - Astronomy and Astrophysics, volume 640A, 98-98 (2020/8-1)

Propargylimine in the laboratory and in space: millimetre-wave spectroscopy and its first detection in the ISM.

BIZZOCCHI L., PRUDENZANO D., RIVILLA V.M., PIETROPOLLI-CHARMET A., GIULIANO B.M., CASELLI P., MARTIN-PINTADO J., JIMENEZ-SERRA I., MARTIN S., REQUENA-TORRES M.A., RICO-VILLAS F., ZENG S. and GUILLEMIN J.-C.

Abstract (from CDS):


Context. Small imines containing up to three carbon atoms are present in the interstellar medium (ISM). As alkynyl compounds are abundant in this medium, propargylimine (2-propyn-1-imine, HC=C-CH=NH) thus represents a promising candidate for a new interstellar detection.
Aims. The goal of the present work is to perform a comprehensive laboratory investigation of the rotational spectrum of propargylimine in its ground vibrational state in order to obtain a highly precise set of rest frequencies and to search for it in space.
Methods. The rotational spectra of E and Z geometrical isomers of propargylimine have been recorded in the laboratory in the 83-500 GHz frequency interval. The measurements have been performed using a source-modulation millimetre-wave spectrometer equipped with a pyrolysis system for the production of unstable species. High-level ab initio calculations were performed to assist the analysis and to obtain reliable estimates for an extended set of spectroscopic quantities. We searched for propargylimine at 3 mm and 2 mm in the spectral survey of the quiescent giant molecular cloud G+0.693-0.027 located in the central molecular zone, close to the Galactic centre.
Results. About 1000 rotational transitions have been recorded for the E- and Z-propargylimine, in the laboratory. These new data have enabled the determination of a very accurate set of spectroscopic parameters including rotational, quartic, and sextic centrifugal distortion constants. The improved spectral data allowed us to perform a successful search for this new imine in the G+0.693-0.027 molecular cloud. Eighteen lines of Z-propargylimine were detected at level >2.5σ, resulting in a column-density estimate of N=(0.24±0.02)x1014cm–2. An upper limit was retrieved for the higher energy E isomer, which was not detected in the data. The fractional abundance (with respect to H2) derived for Z-propargylimine is 1.8x10–10. We discuss the possible formation routes by comparing the derived abundance with those measured in the source for possible chemical precursors.

Abstract Copyright: © L. Bizzocchi et al. 2020

Journal keyword(s): molecular data - methods: laboratory: molecular - methods: observational - techniques: spectroscopic - ISM: clouds - ISM: molecules

VizieR on-line data: <Available at CDS (J/A+A/640/A98): tablee1.dat tablee2.dat tablee3.dat tablee4.dat pgimehfs.cat pgimerot.cat pgimzhfs.cat pgimzrot.cat>

Simbad objects: 2

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Number of rows : 2

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 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11760 0
2 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 532 1

    Equat.    Gal    SGal    Ecl

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2020.10.26-13:53:31

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