J/A+A/606/L3ivo://CDS.VizieR/J/A+A/606/L3doi:10.26093/cds/vizier.36069003CDSFuente A.Gerin M.Pety J.Commercon B.Agundez M.Cernicharo J.,Marcelino N.Roueff E.Lis D.C.Wootten H.A.2017-10-09T08:02:34Z2017-10-04T08:38:55ZCDS support team

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

cds-question@unistra.frmolecular-cloudsinterferometryThe extremely young Class 0 object B1b-S and the first hydrostatic core (FSHC) candidate, B1b-N, provide a unique opportunity to study the chemical changes produced in the elusive transition from the prestellar core to the protostellar phase. We present 40"x70" images of Barnard 1b in the ^13^CO 1-0, C^18^O 1-0, NH_2_D 1(1,1)a-1(0,1)s, and SO 3(2)-2(1) lines obtained with the NOEMA interferometer. The observed chemical segregation allows us to unveil the physical structure of this young protostellar system down to scales of ~500au. The two protostellar objects are embedded in an elongated condensation, with a velocity gradient of ~0.2-0.4m/s/au in the east-west direction, reminiscent of an axial collapse. The NH_2_D data reveal cold and dense pseudo-disks (R~500-1000au) around each protostar. Moreover, we observe evidence of pseudo-disk rotation around B1b-S. We do not see any signature of the bipolar outflows associated with B1b-N and B1b-S, which were previously detected in H_2_CO and CH_3_OH, in any of the imaged species.The non-detection of SO constrains the SO/CH_3_OH abundance ratio in the high-velocity gas.2017A&A...606L...3Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/606/L3CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/577/L2 : Barnard 1b-N and 1b-S nascent bipolar outflows (Gerin+, 2015)J/A+A/606/A35 : Barnard 1b-N and 1b-S 350GHz images (Gerin+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/606/L3https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/606/L3http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/606/L3https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/606/L3https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/606/L3http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/606/L3GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/606/L3/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/606/L3/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/606/L3/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/606/L3/list?GETtext/xml+votable180.050000true53.3387531.126110.0055555555555555566/860https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/606/L3?format=asciidefaultJ/A+A/606/L3/listList of fits imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fits