J/ApJ/767/147ivo://CDS.VizieR/J/ApJ/767/147doi:10.26093/cds/vizier.17670147CDSGiannini T.Lorenzetti D.De Luca M.Strafella F.Elia D.Maiolo B.,Marengo M.Maruccia Y.Massi F.Nisini B.Olmi L.Salama A.,Smith H.A.2017-10-02T08:01:58Z2017-09-11T08:34:34ZCDS support team

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

cds-question@unistra.frmolecular-cloudsinterstellar-mediuminfrared-photometryWe present a survey of H_2_ jets from young protostars in the Vela-D molecular cloud (VMR-D), based on Spitzer-IRAC data between 3.6 {mu}m and 8.0 {mu}m. Our search has led to the identification of 15 jets (two new discoveries) and about 70 well-aligned knots within 1.2 deg^2^. We compare the Infrared Array Camera (IRAC) maps with observations of the H_2_ 1-0 S(1) line at 2.12 {mu}m, with a Spitzer-MIPS map at 24 {mu}m and 70 {mu}m, and with a map of the dust continuum emission at 1.2 mm. From such a comparison, we find a tight association between molecular jets and dust peaks. The jet candidate exciting sources have been searched for in the published catalog of the young stellar objects of VMR-D. In particular, we searched for all the sources of Class II or (preferentially) earlier which are located close to the jet center and aligned with it. Furthermore, the association between jet and exciting source was validated by estimating the differential extinction between the jet opposite lobes. We are able to find a best-candidate exciting source in all but two jets, for which two alternative candidates are given. Four exciting sources are not (or very barely) observed at wavelengths shorter than 24 {mu}m, suggesting that they are very young protostars. Three of them are also associated with the most compact jets (projected length<~0.1 pc). The exciting source spectral energy distributions (SEDs) have been constructed and modeled by means of all the available photometric data between 1.2 {mu}m and 1.2 mm. From SEDs fits, we derive the main source parameters, which indicate that most of them are low-mass protostars. A significant correlation is found between the projected jet length and the [24]-[70] color, which is consistent with an evolutionary scenario according to which shorter jets are associated with younger sources. A rough correlation is found between IRAC line cooling and exciting source bolometric luminosity, in agreement with the previous literature. The emerging trend suggests that mass loss and mass accretion are tightly related phenomena and that both decrease with time.2013ApJ...767..147Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/767/147CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/419/999 : Infrared knots along protostellar jets (Giannini+, 2004)J/ApJ/671/470 : MIPS survey of YSOs in Vela Molecular Ridge-D (Giannini+, 2007)J/ApJ/704/606 : Protostars in the Vela Molecular Cloud (Giannini+, 2009)J/ApJ/719/9 : IRAC point-source catalog of Vela-D cloud (Strafella+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/767/147https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/767/147http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/767/147https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/767/147https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/767/147http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/767/147GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/767/147/table2 (Jets Photometry)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/767/147/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/767/147/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/767/147/table2?GETtext/xml+votable180.050000true131.390833-43.8566670.0055555555555555565/98122.0616683193919197e-20 6.185923063528282e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/767/147?format=asciiInfrareddefaultJ/ApJ/767/147/table2Jets PhotometryKnotIDKnot identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_KnotID[def] Note on KnotID (1)meta.notecharRAJ2000Hour of Right Ascension (J2000) (2)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (2)pos.eq.dec;meta.mainSizeKnot size evaluated on the image at 4.5 {mu}marcsec**2phys.angSizeintF2.12? 2.12 {mu}m flux densitymJyphot.mag;em.IR.Kfloatnullablee_F2.12? 1{sigma} uncertainty in F2.12mJystat.errorfloatnullablel_F3.6[<] 3{sigma} upper limit flag on F3.6meta.code.errorcharF3.6Spitzer/IRAC 3.6 {mu}m flux densitymJyphot.mag;em.IR.3-4umfloate_F3.6? 1{sigma} uncertainty in F3.6mJystat.errorfloatnullableF4.5Spitzer/IRAC 4.5 {mu}m flux densitymJyphot.mag;em.IR.4-8umfloate_F4.51{sigma} uncertainty in F4.5mJystat.errorfloatl_F5.8[<] 3{sigma} upper limit flag on F5.8meta.code.errorcharF5.8? Spitzer/IRAC 5.8 {mu}m flux densitymJyphot.flux.density;em.IR.4-8umfloatnullablee_F5.8? 1{sigma} uncertainty in F5.8mJystat.errorfloatnullablel_F8.0[<] 3{sigma} upper limit flag on F8.0meta.code.errorcharF8.0? Spitzer/IRAC 8.0 {mu}m flux densitymJyphot.flux.density;em.IR.8-15umfloatnullablee_F8.0? 1{sigma} uncertainty in F8.0mJystat.errorfloatnullableLIRACIRAC total luminosity0.01solLumphys.luminosity;em.IRfloatL2.12? 2.12 {mu}m luminosity (L_1-0S(1)_)0.01solLumphys.luminosity;em.IR.Kfloatnullable