J/A+A/469/207ivo://CDS.VizieR/J/A+A/469/207doi:10.26093/cds/vizier.34690207CDSComito C.Schilke P.Endesfelder U.Jimenez-Serra I.Martin-Pintado J.2018-10-02T11:01:10Z2007-08-19T10:21:13ZCDS support team

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

cds-question@unistra.frastrophysical-masersradio-astronomyinterstellar-mediuminterferometryDue to its relatively small distance (725pc), the Cepheus A East star-forming region is an ideal laboratory to study massive star formation processes. Based on its morphology, it has been suggested that the flattened molecular gas distribution around the YSO HW2 may be a 350-AU-radius massive protostellar disk. The goal of our work is to ascertain the nature of this structure. We have employed the Plateau de Bure Interferometer to acquire (sub-)arcsecond-resolution imaging of high-density and shock tracers, such as methyl cyanide (CH3CN) and silicon monoxide (SiO), towards the HW2 position. On the 1" scale, the flattened distribution of molecular gas around HW2 appears to be due to the projected superposition, on the plane of the sky, of at least three protostellar objects, of which at least one is powering a molecular outflow at a small angle with respect to the line of sight. The presence of a protostellar disk around HW2 is not ruled out.2007A&A...469..207Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/469/207CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/469/207https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/469/207http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/469/207https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/469/207https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/469/207http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/469/207GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapAssociated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/469/207RadiodefaultJ/A+A/469/207/listImages listTitleTitle of the imagemeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFileNameName of the image, in subdirectory fig1meta.id;obs.imagecharAssocDataAssociated Data web pagemeta.bib.pagechar