J/A+A/626/A93ivo://CDS.VizieR/J/A+A/626/A93doi:10.26093/cds/vizier.36260093CDSvan der Wiel M.H.D.Jacobsen S.K.Jorgensen J.K.Bourke T.L.,Kristensen L.E.Bjerkeli P.Murillo N.M.Calcutt H.Mueller H.S.P.,Coutens A.Drozdovskaya M.N.Favre C.Wampfler S.F.2019-12-10T07:59:14Z2019-06-20T07:52:10ZCDS support team

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

cds-question@unistra.frinfrared-sourcesradio-astronomyThe majority of stars form in binary or higher order systems. The Class 0 protostellar system IRAS16293-2422 contains two protostars, 'A' and 'B', separated by ~600au and embedded in a single, 10^4 au scale envelope. Their relative evolutionary stages have been debated. We aim to study the relation and interplay between the two protostars A and B at spatial scales of 60 to ~1000au. We selected molecular gas line transitions of CO, H_2_CO, HCN, CS, SiO, and CCH from the ALMA-PILS spectral imaging survey (329-363GHz) and used them as tracers of kinematics, density, and temperature in the IRAS16293-2422 system. The angular resolution of the PILS data set allows us to study these quantities at a resolution of 0.5 arcsec (60 au at the distance of the source). Line-of-sight velocity maps of both optically thick and optically thin molecular lines reveal: (i) new manifestations of previously known outflows emanating from protostar A; (ii) a kinematically quiescent bridge of dust and gas spanning between the two protostars, with an inferred density between 4x10^4^ and 3x10^7^cm^-3^; and (iii) a separate, straight filament seemingly connected to protostar B seen only in CCH, with a flat kinematic signature. Signs of various outflows, all emanating from source A, are evidence of high-density and warmer gas; none of them coincide spatially and kinematically with the bridge. We hypothesize that the bridge arc is a remnant of filamentary substructure in the protostellar envelope material from which protostellar sources A and B have formed. One particular morphological structure appears to be due to outflowing gas impacting the quiescent bridge material. The continuing lack of clear outflow signatures unambiguously associated to protostar B and the vertically extended shape derived for its disk-like structure lead us to conclude that source B may be in an earlier evolutionary stage than source A.2019A&A...626A..93Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/626/A93CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/626/A93https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/626/A93http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/626/A93https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/626/A93https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/626/A93http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/626/A93GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/626/A93/list (List of datacubes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/626/A93/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/626/A93/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/626/A93/list?GETtext/xml+votable180.050000true248.09463-24.476240.0055555555555555566/42970https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/626/A93?format=asciiInfraredRadiodefaultJ/A+A/626/A93/listList of datacubesrecnoRecord 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.numberintNzNumber of slicesmeta.numberintObs.dateObservation datestime.epoch;obsnullablebFreqLower value of observed frequencyGHzem.freq;stat.minfloatBFreqUpper value of observed frequencyGHzem.freq;stat.maxfloatdFreqFrequency resolutionHzspect.resolutionintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fits