Query : 2022A&A...666A.134S

2022A&A...666A.134S - Astronomy and Astrophysics, volume 666A, 134 (2022/10-1)

Laboratory detection and astronomical study of interstellar acetohydroxamic acid, a glycine isomer.


Abstract (from CDS):

Aims. In this work, we aim to achieve the first laboratory detection of acetohydroxamic acid (CH3CONHOH), a relevant glycine isomer, to enable its eventual identification in the ISM.
Methods. We employed a battery of state-of-the-art rotational spectroscopic techniques in the time domain to measure the microwave spectrum of acetohydroxamic acid. We then used the spectral GOTHAM survey performed with the Green Bank Telescope (GBT) to search for the lowest-energy Z-conformer toward the cold and quiescent molecular cloud TMC-1. We also employed a sensitive spectral survey of the chemically rich Galactic Center molecular cloud G+0.693-0.027, based on IRAM 30 m and Yebes 40 m observations.
Results. We report direct experimental frequencies of the ground state of acetohydroxamic acid (up to 40 GHz). The 14N nuclear quadrupole hyperfine structure and the A-E splittings due to the internal rotation were observed and analyzed. Hence, a precise set of the rotational spectroscopic parameters were determined for the two distinct conformers, Z- and E-acetohydroxamic acid, which is the initial and prerequisite step of their radio astronomical search in the ISM using low-frequency surveys. We report the nondetection of acetohydroxamic acid toward both astronomical sources. We derive an upper limit to the column density of this molecule very similar to that obtained for glycine. Its corresponding molecular abundance with respect to molecular hydrogen is found to be ≤1 × 10–9 and 2 × 10–10 in TMC-1 and G+0.693-0.027, respectively, which further constrain the abundance of this glycine isomer in the ISM.

Abstract Copyright: © M. Sanz-Novo et al. 2022

Journal keyword(s): astrochemistry - ISM: molecules - ISM: individual objects: TMC-1 - ISM: individual objects: G+0.693-0.027 - methods: laboratory: molecular

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1681 0
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2299 1
3 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14463 0
4 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2271 1
5 GCM +0.693 -0.027 MoC 17 47 21.9 -28 21 27           ~ 63 0

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