J/ApJ/799/115ivo://CDS.VizieR/J/ApJ/799/115doi:10.26093/cds/vizier.17990115CDSMartin-Drumel M.A.Hindle F.Mouret G.Cuisset A.Cernicharo J.2015-07-13T18:07:34Z2015-06-19T07:39:33ZCDS support team

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

cds-question@unistra.fratomic-physicsIn order to obtain accurate terahertz center frequencies for SO and its isotopologues, we have studied the absorption spectrum of SO, ^34^SO, and ^33^SO up to 2.5THz using continuous-wave terahertz photomixing based on a frequency comb providing an accuracy down to 10kHz. Sulfur monoxide was produced in a radio frequency discharge of air in a cell containing pure sulfur. Together with the strong absorption signal of the main isotopologue, transitions of ^34^SO (^34^S: 4.21%) and ^33^SO (^33^S: 0.75%) were observed in natural abundance. The newly observed transitions constitute an extension of the observed rotational quantum numbers of the molecule toward higher N values, allowing an improvement of the molecular parameters for the three species. An isotopically invariant fit has been performed based on pure rotational and ro-vibrational transitions of all SO isotopologues, enabling their accurate line position prediction at higher frequencies. Thanks to this new set of parameters, it is now possible to predict with very high accuracy the frequencies of the ro-vibrational lines. This should enable the research of SO in the mid-IR using ground-based IR telescopes, space-based telescope archives (Infrared Space Observatory, Spitzer), and future space missions such as the James Webb Space Telescope. This set of parameters is particularly well adapted for the detection of SO lines in O-rich evolved stars or in molecular clouds in absorption against bright IR sources.2015ApJ...799..115Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/799/115CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/563/L3 : NGC1333-IRAS2A CALYPSO IRAM-PdBI SiO & SO maps (Codella+, 2014)J/A+A/531/A103 : Collisional excitation of sulfur dioxide (Cernicharo+, 2011)J/A+A/475/549 : AFGL 2591 maps in CS, SO and HCN lines (Benz+, 2007)J/A+A/358/257 : Molecular clouds SO and CS obs. II. (Nilsson+, 2000)J/A+A/305/960 : Interstellar S isotopes (Chin+, 1996)http://www.astro.uni-koeln.de/cdms : CDMS home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/799/115https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/799/115http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/799/115https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/799/115https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/799/115http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/799/115GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/799/115/table6Pure rotation and ro-vibration transitions of SO included in the isotopically invariant fitAO[16/18] Oxygen isotope (1)phys.atmol.weightintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAS[32/36] Sulfur isotope (1)phys.atmol.weightintN'[0/65] Ro-vibrational upper level N quantum numberphys.mol.qnintJ'[0/66] Ro-vibrational upper level J quantum numberinstr.det.qeintv'[0/33] Upper level vibrational statephys.atmol.configuration;phys.atmol.levelintN"[0/64] Ro-vibrational lower level N quantum numberphys.mol.qnintJ"[0/65] Ro-vibrational lower level J quantum numberinstr.det.qeintv"[0/33] Lower level vibrational statephys.atmol.configuration;phys.atmol.levelintx_nuObsUnit of nuObs (MHz or cm-1)meta.unitcharnuObs[44.3/2511991] Observed frequency (in cm-1 or MHz)em.freqdoublee_nuObs[0/0.5] Uncertainty on nuObsstat.errordoubleBibCodeADS bibcode if anymeta.bib.bibcodecharRefOther reference (2)meta.ref;pos.framechar