J/A+A/587/A118ivo://CDS.VizieR/J/A+A/587/A118doi:10.26093/cds/vizier.35870118CDSPunanova A.Caselli P.Pon A.Belloche A.Andre P.2017-06-19T07:57:32Z2016-02-29T15:44:46ZCDS support team

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

cds-question@unistra.frinterstellar-mediummolecular-cloudsradio-spectroscopyIn cold (T<25K) and dense (n_H_>10^4^cm^-3^) interstellar clouds, molecules such as CO are significantly frozen onto dust grain surfaces. Deuterium fractionation is known to be very efficient in these conditions as CO limits the abundance of H_3_^+^, which is the starting point of deuterium chemistry. In particular, N_2_D^+^ is an excellent tracer of dense and cold gas in star- forming regions. We measure the deuterium fraction, RD, and the CO depletion factor, fd, towards a number of starless and protostellar cores in the L1688 region of the Ophiuchus molecular cloud and search for variations based upon environmental differences across L1688. The kinematic properties of the dense gas traced by the N_2_H^+^ and N_2_D^+^ (1-0) lines are also discussed. Deuterium fraction has been measured via observations of the J=1-0 transition of N2H+ and N2D+ towards 33 dense cores in different regions of L1688. We estimated the CO depletion factor using C^17^O(1-0) and 850 micron dust continuum emission from the SCUBA survey. We carried out all line observations with the IRAM 30 meter antenna.2016A&A...587A.118Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/587/A118CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/472/519 : N2H+(1-0) maps of Ophiuchus main cloud (Andre+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/587/A118https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/587/A118http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/587/A118https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/587/A118https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/587/A118http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/587/A118GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/587/A118/ln2hp10 (Informations on L1688_N2H+10.fit file)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/587/A118/ln2hp10?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/587/A118/ln2hp10?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/587/A118/ln2hp10?GETtext/xml+votable180.050000true246.623-24.40740.005555555555555556Cone search capability for table J/A+A/587/A118/lc17o10 (Informations on L1688_C17O10.fit file)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/587/A118/lc17o10?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/587/A118/lc17o10?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/587/A118/lc17o10?GETtext/xml+votable180.050000true245.785-24.27250.005555555555555556Cone search capability for table J/A+A/587/A118/lc17o21 (Informations on L1688_C17O21.fit file)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/587/A118/lc17o21?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/587/A118/lc17o21?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/587/A118/lc17o21?GETtext/xml+votable180.050000true276.4864-25.996040.005555555555555556Cone search capability for table J/A+A/587/A118/ln2dp10 (Informations on L1688_N2D+10.fit file)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/587/A118/ln2dp10?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/587/A118/ln2dp10?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/587/A118/ln2dp10?GETtext/xml+votable180.050000true246.61-24.40860.005555555555555556Cone search capability for table J/A+A/587/A118/ln2dp21 (Informations on L1688_N2D+21.fit file)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/587/A118/ln2dp21?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/587/A118/ln2dp21?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/587/A118/ln2dp21?GETtext/xml+votable180.050000true246.61-24.40860.0055555555555555566/28791 28797 42981 42983 42992https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/587/A118?format=asciiRadiodefaultJ/A+A/587/A118/ln2hp10Informations on L1688_N2H+10.fit filerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintScanNumber of scansmeta.numberintSourceSource name in fits headermeta.id;meta.fitscharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainImageFreq[9.61700e+10] Image frequencyHzem.freqdoubleVelVelocitykm/sphys.velocintSimbadNameSimbad column added by the CDSmeta.idcharJ/A+A/587/A118/lc17o10Informations on L1688_C17O10.fit fileSimbadNameSimbad column added by the CDSmeta.idcharScanNumber of scansmeta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNaxisNumber of observed frequenciesmeta.numberintCoreDense core namemeta.idcharSourceSource name in fits headermeta.id;meta.fitscharTelTelescopmeta.notecharRAJ2000Source right ascension (J2000) at Epoch Epdegpos.eq.ra;meta.mainDEJ2000Source declination (J2000) at Epoch Epdegpos.eq.dec;meta.mainEpEpoch of positiontime.epochintoRAOffset in right ascension in respect to the Source positionarcsecpos.eq.ra;arith.difffloatoDEOffset in Declination in respect to the Source positionarcsecpos.eq.dec;arith.difffloatImageFreq[1.15356e+11] Image frequencyHzem.freqdoubleVelVelocitykm/sphys.velocintdeltaV{delta}Vkm/spos.cartesian.ydoubleObs.DateObservation datetime.epoch;obsnullableJ/A+A/587/A118/lc17o21Informations on L1688_C17O21.fit fileSimbadNameSimbad column added by the CDSmeta.idcharCoreDense core namemeta.idcharImageFreqImage frequencyHzem.freqdoubleSourceSource name in fits headermeta.id;meta.fitscharTelTelescopmeta.notecharRASource right ascension at Epochdegpos.eq.ra;meta.maindeltaV{delta}Vkm/spos.cartesian.ydoubleObs.DateObservation datetime.epoch;obsnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNaxisNumber of observed frequenciesmeta.numberintScanNumber of scansmeta.numberintDESource declination at Epochdegpos.eq.dec;meta.mainEpochEpoch for positionyrtime.equinoxintoRAOffset in right ascension in respect to the Source positionarcsecpos.eq.ra;arith.difffloatoDEOffset in declination in respect to the Source positionarcsecpos.eq.dec;arith.difffloatRestFreq[2.24714e+11] Rest frequencyHzem.freqdoubleJ/A+A/587/A118/ln2dp10Informations on L1688_N2D+10.fit fileSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNaxisNumber of observed frequenciesmeta.numberintScanNumber of scansmeta.numberintSourceSource name in fits headermeta.id;meta.fitscharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainImageFreqImage frequencyHzem.freqdoubleVelVelocitykm/sphys.velocintdeltaV{delta}Vkm/spos.cartesian.yfloatObs.DateObservation datetime.epoch;obsnullableJ/A+A/587/A118/ln2dp21Informations on L1688_N2D+21.fit fileSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNaxisNumber of observed frequenciesmeta.numberintScanNumber of scansmeta.numberintSourceSource name in fits headermeta.id;meta.fitscharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainRestFreq[1.54217e+11] Rest frequencyHzem.freqdoubleImageFreq[1.62734e+11] Image frequencyHzem.freqdoubleVelVelocitykm/sphys.velocintdeltaV{delta}Vkm/spos.cartesian.yfloatObs.DateObservation datetime.epoch;obschar