J/MNRAS/404/661ivo://CDS.VizieR/J/MNRAS/404/661doi:10.26093/cds/vizier.74040661CDSVarricatt W.P.Davis C.J.Ramsay S.Todd S.P.2024-07-11T20:16:37Z2010-06-21T10:02:27ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsinfrared-sourcesWe have carried out a near-infrared imaging survey of luminous young stellar outflow candidates using the United Kingdom Infrared Telescope. Observations were obtained in the broad band K (2.2um) and through narrow band filters at the wavelengths of H_2_ v=1-0 S(1) (2.1218um) and Br gamma (2.166um) lines. Fifty regions were imaged with a field of view of 2.2x2.2arcmin^2^. Several young embedded clusters are unveiled in our near-infrared images. 76% of the objects exhibit H_2_ emission and 50% or more of the objects exhibit aligned H_2_ emission features suggesting collimated outflows, many of which are new detections. These observations suggest that disk accretion is probably the leading mechanism in the formation of stars, at least up to late O spectral types. The young stellar objects responsible for many of these outflows are positively identified in our images based on their locations with respect to the outflow lobes, 2MASS colours and association with MSX, IRAS, millimetre and radio sources. The close association of molecular outflows detected in CO with the H_2_ emission features produced by shock excitation by jets from the young stellar objects suggests that the outflows from these objects are jet-driven. Towards strong radio emitting sources, H_2_ jets were either not detected or were weak when detected, implying that most of the accretion happens in the pre-UCHII phase; accretion and outflows are probably weak when the YSO has advanced to its UCHII stage.2010MNRAS.404..661Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/404/661CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/404/661https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/404/661http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/404/661https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/404/661https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/404/661http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/404/661GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/404/661/table (List of studied sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/404/661/table?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/404/661/table?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/404/661/table?GETtext/xml+votable180.050000true11.2455.78833330.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/MNRAS/404/6616/1307 1340 1470 2973 13050 14255 14267 14307 14309 14353 14355 14622 14625 14630 14647 14655 14689 14692 14697 15394 15430 15458 15479 15624 21671 23795 24189 24325 24378 24499 24507 24554 29112-29113 29116 29461 29509 29513 30219 30241 30244-30245 30318 30425 30616 30622 30714-30715https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/404/661?format=asciiInfrareddefaultJ/MNRAS/404/661/tableList of studied sourcesn_IRASmeta.ref.urlcharHf[MK] Filter used for H_2_ (2.122 or 2.122MK) (1)meta.notecharSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/50] Object sequential numbermeta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainIRASObject namemeta.id;meta.maincharprimaryFile.KFilename of image in "fits" subdirectorymeta.id;meta.filecharFile.HFilename of H_2_ image in "fits" subdirectorymeta.id;meta.filecharFile.HcFilename of H_2_ image after normalization and continuum-subtraction in "fits" subdirectorymeta.id;meta.filecharFile.BFilename of Br{gamma} image (2.183um) in "fits" subdirectorymeta.id;meta.filecharFile.BcFilename of Br{gamma} image after normalization and continuum-subtraction in "fits" subdirectorymeta.id;meta.filecharDownloadKDownload the FITS filesmeta.ref.urlcharDownloadHDownload the FITS filesmeta.ref.urlcharDownloadHcDownload the FITS filesmeta.ref.urlcharDownloadBDownload the FITS filesmeta.ref.urlcharDownloadBcDownload the FITS filesmeta.ref.urlcharJ/MNRAS/404/661/tableb1MHO numbers of the H2 line emission features identified in this paper (from http://www.jach.hawaii.edu/UKIRT/MHCat/)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/50] Object sequential numbermeta.recordintIRASObject Name (HHMMm+DDMM)meta.id;meta.maincharNH2? H2 feature number (is Seq number)meta.idintnullableH2ID1First H2 line emission features (labelled on Figs. A1-A50)meta.bib.figcharH2ID3? Third H2 line emission features (labelled on Figs. A1-A50)meta.bib.figintnullableMHO1MHO number(s) corresponding to H2ID1meta.idcharMHO2? MHO number(s) corresponding to H2ID2meta.idintnullableMHO3? MHO number(s) corresponding to H2ID3meta.idintnullableH2ID2Second H2 line emission features (labelled on Figs. A1-A50)meta.bib.figchar