J/A+A/629/A136ivo://CDS.VizieR/J/A+A/629/A136doi:10.26093/cds/vizier.36290136CDSSanchez Contreras C.Baez-Rubio A.Alcolea J.Castro-Carrizo A.,Bujarrabal V.Martin-Pintado J.Tafoya D.2020-04-29T07:56:13Z2019-09-18T07:29:19ZCDS support team

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

cds-question@unistra.frbe-starsinterferometryWe present interferometric observations with the Atacama Large Millimeter Array (ALMA) of the free-free continuum and recombination line emission at 1 and 3mm of the Red Square Nebula surrounding the B[e]-type star MWC922. The distance to the source, which is unknown, is usually taken to be d=1.7-3kpc. The unprecedented angular resolution (up to ~0.02") and exquisite sensitivity of these data reveal for the first time the structure and kinematics of the nascent compact ionized region at its center. We imaged the line emission of H30{alpha} and H39{alpha}, previously detected with single-dish observations, and of H51{epsilon}, H55{gamma}, and H63{delta}, detected for the first time in this work. The line emission is seen over a full velocity range of ~180km/s arising in a region of diameter <0.14" (less than a few hundred au) in the maser line H30{alpha}, which is the most intense transition reported here. We resolve the spatio-kinematic structure of a nearly edge-on disk rotating around a central mass of ~10M_{sun}_ (d=1.7kpc) or ~18M_{sun}_ (d=3kpc), assuming Keplerian rotation. Our data also reveal a fast (~100km/s) bipolar ejection (possibly a jet) orthogonal to the disk. In addition, a slow (<15km/s) wind may be emanating from the disk. Both, the slow and the fast winds are found to be rotating in a similar manner to the ionized layers of the disk. This represents the first empirical proof of rotation in a bipolar wind expanding at high velocity (~100km/s).2019A&A...629A.136Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/629/A136CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/629/A136https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/629/A136http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/629/A136https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/629/A136https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/629/A136http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/629/A136GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/629/A136/list (List of fits files)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/629/A136/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/629/A136/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/629/A136/list?GETtext/xml+votable180.050000true275.3169-13.023810.0055555555555555566/29506https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/629/A136?format=asciidefaultJ/A+A/629/A136/listList of fits filesDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintNz? Number of slices for the datacubesmeta.numberintnullableVRADVRAD value for the maps or lower value of VRAD interval for the datacubesm/sphys.velocdoubleBVRAD? Upper value of VRAD interval for the datacubesm/sphys.velocintnullabledVRAD? VRAD resolution for the datacubesm/sspect.resolutionintnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fits