J/ApJ/438/813ivo://CDS.VizieR/J/ApJ/438/813doi:10.26093/cds/vizier.14380813CDSSTROM K.M.KEPNER J.STROM S.E.2013-03-05T06:34:39Z1998-02-19T17:52:22ZCDS support team

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

cds-question@unistra.frastrometryinfrared-photometryastronomical-object-identificationThis contribution reports the results of an infrared imaging survey aimed at characterizing the stellar populations associated with the three densest star-forming cores in the Ophiuchus molecular cloud complex. The survey has sufficient sensitivity at J, H, and K (at 5{sigma} limits of 16.5, 15.4 and 14.2) to provide a complete census of embedded young stellar objects (YSOs) with masses greater than the hydrogen-burning limit, provided that their ages are less than 3 Myr and that they are obscured by no more than ~18 mag of visual extinction. Our data suggest (1) a large fraction (>70%) of the sources located within the cores are still surrounded by circumstellar disks and/or envelopes; and (2) the shape of the initial mass function for masses, M<1M_sun_, appears to be consistent with that derived from the solar neighborhood. We also report the results of a deeper imaging survey of centimeter continuum sources (14 sources) in these star-forming cores and in the larger Ophiuchus complex (eight sources). A large fraction 11/14) of the radio sources associated with the cores appear to have infrared excesses diagnostic of circumstellar accretion disks and/or infalling circumstellar envelopes. In these cases, the centimeter continuum radiation most likely diagnoses the ionized component of energetic winds or jets which characterize YSOs during the disk accretion phase. By contrast, of the eight radio sources located outside dense cores, only two show infrared excesses. For the sources which lack infrared excesses, the centimeter continuum emission is probably produced by gyrosynchrotron radiation arising in the stellar magnetospheres of weak emission T Tauri stars. There is some evidence that the frequency of binary companions among the sample of centimeter continuum sources in the molecular cores may be higher (by as much as a factor of 3-4) than that among the older, distributed population of young stars in the larger Ophiuchus cloud complex.1995ApJ...438..813Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/438/813CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/438/813https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/438/813http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/438/813https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/438/813https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/438/813http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/438/813GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/438/813/table1 (Photometry data from the SQIID Mosaic)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/438/813/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/438/813/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/438/813/table1?GETtext/xml+votable180.050000true246.484381-24.3466680.005555555555555556Cone search capability for table J/ApJ/438/813/table2 (Derived values from the SQIID data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/438/813/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/438/813/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/438/813/table2?GETtext/xml+votable180.050000true246.484381-24.3466680.005555555555555556Cone search capability for table J/ApJ/438/813/table3 (Data for stars with photometry of lower accuracy)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/438/813/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/438/813/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/438/813/table3?GETtext/xml+votable180.050000true246.469109-24.3761810.0055555555555555566/429813.533079825982027e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/438/813?format=asciiInfrareddefaultJ/ApJ/438/813/table1Photometry data from the SQIID MosaicTypeType of stars (3)src.classcharKmagK magnitudemagphot.mag;em.IR.Kfloatn_H-K[b] See Note (1)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA1950Right ascension (1950)pos.eq.ra;meta.mainDE1950Declination (1950)pos.eq.dec;meta.maine_Kmag? Error on K magnitudemagstat.error;phot.mag;em.IR.Kfloatnullablel_J-H[><] Limit flag on J-Hmeta.code.error;phot.color;em.IR.JcharJ-H? J-H colour indexmagphot.color;em.IR.J;em.IR.Hfloatnullablen_J-H[b] See Note (1)meta.notechare_J-H? Error on J-Hmagstat.error;phot.color;em.IR.Jfloatnullablel_H-K[><] Limit flag on H-Kmeta.code.error;phot.color;em.IR.HcharH-K? H-K colour indexmagphot.color;em.IR.H;em.IR.Kfloatnullablee_H-K? Error on H-Kmagstat.error;phot.color;em.IR.HfloatnullableCoreDense molecular core association (2)meta.codecharn_Id[a] See Note (4)meta.notecharIdIdentificationmeta.idchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/ApJ/438/813/table2Derived values from the SQIID datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA1950Right ascension (1950)pos.eq.ra;meta.mainDE1950Declination (1950)pos.eq.dec;meta.mainJ10? Derived reddening-corrected absolute J magnitudemagphys.magAbs;em.IR.JfloatnullableA1J? Extinction A^1^_J_ (1)magphys.absorptionfloatnullableJ20? Reddening-corrected absolute J magnitude (2)magphys.magAbs;em.IR.JfloatnullableA2J? Extinction A^2^_J_ (2)magphys.absorptionfloatnullablel_Mass0.3Limit flag on massmeta.code.errorcharMass0.3? Mass derived from D'Antona and Mazzitelli (1994) tracks assuming a cluster age of 0.3MyrsolMassphys.massfloatnullablen_Mass0.3[f] foregroundmeta.notecharl_Mass1Limit flag on massmeta.code.errorcharMass1? Mass derived from D'Antona and Mazzitelli (1994) tracks assuming a cluster age of 1MyrsolMassphys.massfloatnullablen_Mass1[f] foregroundmeta.notecharIdIdentificationmeta.idchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/ApJ/438/813/table3Data for stars with photometry of lower accuracyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA1950Right ascension (1950)pos.eq.ra;meta.mainDE1950Declination (1950)pos.eq.dec;meta.mainKmagK magnitudemagphot.mag;em.IR.Kfloate_Kmag? Error on K magnitudemagstat.error;phot.mag;em.IR.Kfloatnullablel_J-H[><] Limit flag on J-Hmeta.code.error;phot.color;em.IR.JcharJ-H? J-H colour indexmagphot.color;em.IR.J;em.IR.Hfloatnullablen_J-H[b] See Note (1)meta.notechare_J-H? Error on J-Hmagstat.error;phot.color;em.IR.Jfloatnullablel_H-K[><] Limit flag on H-Kmeta.code.error;phot.color;em.IR.HcharH-K? H-K colour indexmagphot.color;em.IR.H;em.IR.Kfloatnullablen_H-K[b] See Note (1)meta.notechare_H-K? Error on H-Kmagstat.error;phot.color;em.IR.HfloatnullableCoreDense molecular core association (2)meta.id.assoccharTypeType of stars (3)src.classcharn_Id[a] See Note (4)meta.notecharIdIdentificationmeta.idchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/ApJ/438/813/table6Multiplicity measures of VLA sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSampleSamplemeta.idcharmfMultiplicy frequency (1)em.freqfloatcpCompanion probability (2)stat.probabilityfloatpfPairing factor (3)arith.factorfloatNNumber of sourcesmeta.numberintNotes? Notes (4)meta.noteintnullableJ/ApJ/438/813/table4Infrared data for the {rho} Ophiuchi cloud VLA sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObjectObjectmeta.notecharl_Jmag[>] Limit flag on J magnitudemeta.code.errorcharJmag? J magnitudemagphot.mag;em.IR.Jfloatnullableq_Jmag[ABCD] Error on J magnitude (1)meta.code.qualcharl_Hmag[>] Limit flag on H magnitudemeta.code.errorcharHmag? H magnitudemagphot.mag;em.IR.Hfloatnullableq_Hmag[ABCD] Error on H magnitude (1)meta.code.qualcharl_Kmag[>] Limit flag on Kmagmeta.code.errorcharKmag? K magnitudemagphot.mag;em.IR.Kfloatnullableq_Kmag[ABCD] Error on K magnitude (1)meta.code.qualcharl_L'magLimit flag on L' magnitudemeta.code.errorcharL'mag? L' magnitudemagphot.mag;em.IR.3-4umfloatnullableq_L'mag[ABCD] Error on L' magnitude (1)meta.code.qualcharl_Mmag[>] Limit flag on Mmagmeta.code.errorcharMmag? M magnitudemagphot.mag;em.IR.4-8umfloatnullableq_Mmag[ABCD] Error on M magnitude (1)meta.code.qualcharl_J-H[>] Limit flag on J-Hmeta.code.error;phot.color;em.IR.JcharJ-H? J-H colour indexmagphot.color;em.IR.J;em.IR.Hfloatnullableu_J-HUncertainty flag on J-Hmeta.code.error;phot.color;em.IR.Jcharl_H-K[>] Limit flag on H-Kmeta.code.error;phot.color;em.IR.HcharH-K? H-K colour indexmagphot.color;em.IR.H;em.IR.Kfloatnullableu_H-KUncertainty flag on H-Kmeta.code.error;phot.color;em.IR.Hcharl_K-L'[><] Limit flag on K-L'meta.code.error;phot.colorcharK-L'? K-L' colour indexmagphot.color;em.IR.K;em.IR.3-4umfloatnullableu_K-L'Uncertainty flag on K-L'meta.code.error;phot.colorcharK-M? K-M colour indexmagphot.color;em.IR.K;em.IR.4-8umfloatnullableu_K-MUncertainty flag on K-Mmeta.code.errorcharNotesNotes (2)meta.notechar