J/A+A/666/A158ivo://CDS.VizieR/J/A+A/666/A158doi:10.26093/cds/vizier.36660158CDSKoucky J.Kolesnikova L.Lukova K.Vavra K.Kania P.Coutens A.,Loison J.-C.Jorgensen J.K.Belloche A.Urban S.2022-11-09T06:11:50Z2022-10-21T10:20:32ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frinterstellar-mediumspectroscopyatomic-physicsSeveral sugar-like molecules have been found in the interstellar medium. The molecule studied in this work, 2-hydroxyprop- 2-enal, is among the candidates to be searched for, as it is a dehydration product of C3 sugars and contains structural motifs typical for some interstellar molecules. Furthermore, it has been recently predicted to be more abundant in the interstellar medium than its tentatively detected isomer 3-hydroxypropenal. So far, only low-frequency microwave data of 2-hydroxyprop-2-enal have been published. The aim of this work is to deepen knowledge about the millimetre-wave spectrum of 2-hydroxyprop-2-enal in the region enabling its detailed search towards astronomical objects. In particular, we target the solar-type protostar IRAS 16293-2422 and star-forming region Sagittarius (Sgr) B2(N). The rotational spectrum of 2-hydroxyprop-2-enal was measured and analysed in the frequency regions of 128-166GHz and 285-329GHz. The interstellar exploration towards IRAS 16293-2422 was based on the Atacama Large Millimeter/submillimeter Array (ALMA) data of the Protostellar Interferometric Line Survey. We also used the imaging spectral line survey ReMoCA performed with ALMA toward Sgr B2(N) to search for 2-hydroxyprop-2-enal in the interstellar medium. We modelled the astronomical spectra under the assumption of local thermodynamic equilibrium. We provide laboratory analysis of hundreds of rotational transitions of 2-hydroxyprop-2-enal in the ground state and the lowest lying excited vibrational state. We report its nondetection towards IRAS16293 B. The 2-hydroxyprop-2-enal/3-hydroxypropenal abundance ratio is estimated to be <~0.9-1.3 in agreement with the predicted value of ~1.4. We also report the nondetection of 2-hydroxyprop-2-enal toward the hot molecular core Sgr B2(N1). We did not detect the related aldehydes 2-hydroxypropanal and 3-hydroxypropenal either. We find that these three molecules are at least 9, 4, and 10 times less abundant than acetaldehyde in this source, respectively. Despite the nondetections of 2-hydroxyprop-2-enal, the results of this work represent a significant improvement on previous investigations in the microwave region and meets the requirements for further searches of this molecule in the interstellar medium.2022A&A...666A.158Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/666/A158CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/666/A158https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/666/A158http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/666/A158https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/666/A158https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/666/A158http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/666/A158GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/666/A158/table5List of the measured transitions of 2-hydroxyprop-2-enalNotesSource of the data (1)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStateVibrational statephys.atmol.configurationcharJ'Upper state J quantum numberphys.atmol.configurationintKa'Upper state Ka quantum numberphys.atmol.qnintKc'Upper state Kc quantum numberphys.atmol.qnintJ"Lower state J quantum numberphys.atmol.configurationintKa"Lower state Ka quantum numberphys.atmol.qnintKc"Lower state Kc quantum numberphys.atmol.qnintFreqObsObserved transition frequencyMHzem.freqdoubleO-CObserved minus calculated frequencyMHzem.freq;stat.fit.omcfloatUncExperimental uncertaintyMHzstat.errorfloat(O-C)b? Observed minus calculated frequency for blendsMHzem.freq;stat.fit.omcfloatnullableWgb? Weight of the components of the blendsphys.atmol.weightfloatnullable