J/A+A/557/A94ivo://CDS.VizieR/J/A+A/557/A94doi:10.26093/cds/vizier.35570094CDSSanchez-Monge A.Lopez-Sepulcre A.Cesaroni R.Walmsley C.M.,Codella C.Beltran M.T.Pestalozzi M.Molinari S.2018-01-02T13:43:08Z2013-09-09T15:41:44ZCDS support team

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

cds-question@unistra.frinfrared-sourcesh-ii-regionsinterstellar-mediumWe present the results of a study of 14 molecular outflows associated with high-mass star formation. We used the IRAM30m telescope to characterize the outflow emission in the SiO(2-1), SiO(5-4) and HCO^+^(1-0) lines. We detect outflows in all the 14 high-mass star-forming regions in both, the SiO and HCO^+^ lines. Six of the fourteen outflows show bipolarity. The physical parameters derived for these outflows are consistent with outflows powered by massive young stellar objects with luminosities in the range 10^3^-10^4^L_{sun}_. We found a decrease of the SiO abundance (from 10^-8^ to 10^-9^) as the object evolves in time, while there are hints of a possible increase of the HCO^+^ outflow energetics with time. These results suggest a scenario in which SiO is largely enhanced in the first evolutionary stages, probably due to strong shocks produced by the protostellar jet. As the object evolves, the power of the jet would decrease and so does the SiO abundance. During this process, however, the material surrounding the protostar would have been swept up by the jet, and the outflow activity, traced by entrained molecular material (HCO^+^), would increase with time.2013A&A...557A..94Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/557/A94CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/557/A94https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/557/A94http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/557/A94https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/557/A94https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/557/A94http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/557/A94GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/557/A94/table1 (List of observed sources, and spectral energy distribution parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/557/A94/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/557/A94/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/557/A94/table1?GETtext/xml+votable180.050000true274.491667-12.1241670.0055555555555555566/14309 29509-29510 29513 29533 29535 30241 30318 30618https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/557/A94?format=asciiInfrareddefaultJ/A+A/557/A94/table1List of observed sources, and spectral energy distribution parametersSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSource sequential numbermeta.recordintSourceSource name (1)meta.id;meta.maincharn_Source[f] Simultaneous observations (2)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVlsrSystemic LSR velocity (3)km/sphys.veloc;pos.lsrfloatDistDistancekpcpos.distance;pos.heliocentricfloatCl[LD] IR classification: L=IR-luminous (IRL), or D=IR-dark (IRD) (4)meta.code.classcharbetaSED fit {beta} value (5) (6)stat.fit.paramfloatTdSED fit dust temperature (5)Kphys.temperatureintMassSED fit mass (5)solMassphys.mass;meta.modelledintLbolBolometric luminosity (7)solLumphys.luminosityintL/MLuminosity to mass ratioSunphys.luminosityfloatF-HCOData cube file name in subdirectory fits with HCO^+^(1-0) line (89.1885GHz) (resolution 4.5arcsec/pix, 2.7m/s)meta.id;pos.angResolution;meta.fitscharF-SiO21Data cube file name in subdirectory fits with SiO(2-1) line (86.8470GHz) (resolution 4.6arcsec/pix, 2.7m/s)meta.id;pos.angResolution;meta.fitscharF-SiO54Data cube file name in subdirectory fits with SiO(5-4) line (217.1050GHz) (resolution 1.8arcsec/pix, 1.1m/s)meta.id;pos.angResolution;meta.fitschar