J/A+A/595/A128ivo://CDS.VizieR/J/A+A/595/A128doi:10.26093/cds/vizier.35950128CDSMuller S.Mueller H.S.P.Black J.H.Beelen A.Combes F.Curran S.,Gerin M.Guelin M.Henkel C.Martin S.Aalto S.Falgarone E.,Menten K.M.Schilke P.Wiklind T.Zwaan M.A.2017-07-03T14:25:28Z2016-11-16T08:39:14ZCDS support team

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

cds-question@unistra.frquasarsspectroscopyWe report the detection of OH^+^ and H_2_O^+^ in the z=0.89 absorber toward the lensed quasar PKS 1830-211. The abundance ratio of OH^+^ and H_2_O^+^ is used to quantify the molecular hydrogen fraction (fH2) and the cosmic-ray ionization rate of atomic hydrogen ({dzeta}_H_) along two lines of sight, located at ~2kpc and ~kpc to either side of the absorber's center. The molecular fraction decreases outwards, from ~0.04 to ~0.02, comparable to values measured in the Milky Way at similar galactocentric radii. For {dzeta}_H_, we find values of ~2x10^-14^s^-1^ and ~3x10^-15^s^-1^, respectively, which are slightly higher than in the Milky Way at comparable galactocentric radii, possibly due to a higher average star formation activity in the z=0.89 absorber. The ALMA observations of OH^+^, H_2_O^+^, and other hydrides toward PKS 1830-211 reveal the multi-phase composition of the absorbing gas. Taking the column density ratios along the southwest and northeast lines of sight as a proxy of molecular fraction, we classify the species ArH^+^, OH^+^, H_2_Cl^+^, H_2_O^+^, CH, and HF as tracing gases increasingly more molecular. Incidentally, our data allow us to improve the accuracy of H_2_O^+^ rest frequencies and thus refine the spectroscopic parameters.2016A&A...595A.128Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/595/A128CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/535/A103 : 7mm spectral survey of PKS 1830-211 (Muller+, 2011)J/A+A/574/A108 : Molecular absorption lines in PKS 1830-211 (Schulz+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/595/A128https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/595/A128http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/595/A128https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/595/A128https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/595/A128http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/595/A128GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/595/A128/ohPKS 1830-211 OH^+^ spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqObserved frequencyGHzem.freqdoubleIntIntensity, normalized to the total continuum levelphot.flux;em.opt;arith.ratiodoubleJ/A+A/595/A128/h2o_607PKS 1830-211 H_2_O^+^ 607GHz transition spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqObserved frequencyGHzem.freqdoubleIntIntensity, normalized to the total continuum levelphot.flux;em.opt;arith.ratiodouble