J/A+A/637/A7ivo://CDS.VizieR/J/A+A/637/A7doi:10.26093/cds/vizier.36370007CDSMuller S.Roueff E.Black J.H.Gerin M.Guelin M.Menten K.M.,Henkel C.Aalto S.Combes F.Martin S.Marti-Vidal I.2020-09-16T12:17:25Z2020-05-01T08:55:11ZCDS support team

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

cds-question@unistra.frquasarsradio-astronomyradio-spectroscopyDeuterium and lithium are light elements of high cosmological and astrophysical importance. In this work we report the first detection of deuterated molecules and a search for lithium hydride, ^7^LiH, at redshift z=0.89 in the spiral galaxy intercepting the line of sight to the quasar PKS 1830-211. We used ALMA to observe several submillimeter lines of ND, NH_2_D, and HDO, and their related isotopomers NH_2_, NH_3_, and H^18^_2_O, in absorption against the southwest image of the quasar, allowing us to derive XD/XH abundance ratios. The absorption spectra mainly consist of two distinct narrow velocity components for which we find remarkable differences. One velocity component shows XD/XH abundances that is about 10 times larger than the primordial elemental D/H ratio, and no variability of the absorption profile during the time span of our observations. In contrast, the other component shows a stronger deuterium fractionation. Compared to the first component, this second component has XD/XH abundances that are 100 times larger than the primordial D/H ratio, a deepening of the absorption by a factor of two within a few months, and a rich chemical composition, with relative enhancements of N_2_H^+^, CH_3_OH, SO_2_ and complex organic molecules. We therefore speculate that this component is associated with the analog of a Galactic dark cloud, while the first component is likely more diffuse. Our search for the ^7^LiH (1-0) line was unsuccessful and we derive an upper limit ^7^LiH/H_2_=4x10^-13^ (3{sigma}) in the z=0.89 absorber toward PKS 1830.211. Besides, with ALMA archival data, we could not confirm the previous tentative detections of this line in the z=0.68 absorber toward B0218+357; we derive an upper limit ^7^LiH/H_2_=5x10^-11^ (3{sigma}), although this is less constraining than our limit toward PKS 1830.211. We conclude that, as in the Milky Way, only a tiny fraction of lithium nuclei are possibly bound in LiH in these absorbers at intermediate redshift.2020A&A...637A...7Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/637/A7CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/637/A7https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/637/A7http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/637/A7https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/637/A7https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/637/A7http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/637/A7GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapRadiodefaultJ/A+A/637/A7/sphdoPKS1830-211 spectrum of the 464GHz transition of HDOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHVVelocity in heliocentric frame, z=0.88582km/sspect.dopplerVeloc;pos.heliocentric;obs.fielddoubleIntIntensity normalized to the continuum levelphot.flux;em.opt;arith.ratiodoubleJ/A+A/637/A7/spnd522PKS1830-211 spectrum of the 522GHz transition of NDHVVelocity in heliocentric frame, z=0.88582km/sspect.dopplerVeloc;obs.field;pos.heliocentricdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIntIntensity normalized to the continuum levelphot.flux;em.opt;arith.ratiodoubleJ/A+A/637/A7/spnh2dPKS1830-211 spectrum of the 470GHz transition of NH_2_DrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHVVelocity in heliocentric frame, z=0.88582km/sspect.dopplerVeloc;pos.heliocentric;obs.fielddoubleIntIntensity normalized to the continuum levelphot.flux;em.opt;arith.ratiodoubleJ/A+A/637/A7/spnd546PKS1830-211 spectrum of the 546GHz transition of NDrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHVVelocity in heliocentric frame, z=0.88582km/sspect.dopplerVeloc;obs.field;pos.heliocentricdoubleIntIntensity normalized to the continuum levelphot.flux;em.opt;arith.ratiodouble