J/ApJ/921/81ivo://CDS.VizieR/J/ApJ/921/81doi:10.26093/cds/vizier.19210081CDSKalari V.M.2023-08-16T15:09:26Z2021-11-30T13:26:40ZCDS support team

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

cds-question@unistra.fropen-star-clusterspre-main-sequence-starsvisible-astronomyh-alpha-photometryThe Trifid Nebula is a young, nearby star-forming region where star formation is proposed to have been triggered by cloud-cloud collision (CCC), based on observations of molecular clouds. It offers a unique opportunity to test whether the CCC hypothesis is supported by the spatial distribution and star formation chronology of young stars. We present the first study of the optically visible pre-main sequence (PMS) population of the region using riH{alpha} imaging and Gaia astrometry. Combined with an analysis of young stellar objects (YSOs) using infrared imaging, we capture the spatial distribution and star formation chronology of the young stellar population. From the analysis, 15 Flat/Class I YSOs, 46 Class II YSOs, and 41 accreting PMS stars are identified (diskless/non-accreting sources are not included in the analysis). The distance based on Gaia parallaxes is ~1250pc, significantly closer than previously reported. The Class II YSOs and PMS stars (~1.5Myr old) are spread toward the edge of the molecular clouds. They are slightly younger than the estimated crossing time of ~2.7Myr and closer to the estimated dynamical age ~0.85Myr. Younger Class I YSOs are more concentrated spatially. There exists a cavity devoid of young stars where the two clouds overlap. This evidence suggests that the current generation of stars formed after the collision of two clouds ~1Myr ago, and this result can be corroborated using future spectroscopic studies.2021ApJ...921...81Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/921/81CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)II/341 : VPHAS+ DR2 survey (Drew+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/921/81https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/921/81http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/921/81https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/921/81https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/921/81http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/921/81GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/921/81/table1 (Infrared photometry of young stellar objects in the Trifid nebula)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/921/81/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/921/81/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/921/81/table1?GETtext/xml+votable180.050000true270.632125-23.03797220.005555555555555556Cone search capability for table J/ApJ/921/81/table2 (Optical photometry, Gaia astrometry, and estimated stellar properties of pre-main sequence stars in the Trifid nebula)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/921/81/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/921/81/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/921/81/table2?GETtext/xml+votable180.050000true270.59925-22.99408330.0055555555555555566/289136.772611666688002e-21 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/921/81?format=asciiOpticaldefaultJ/ApJ/921/81/table1Infrared photometry of young stellar objects in the Trifid nebularecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLIMPSEGLIMPSE identifier (GLLL.llll+BB.bbbb)meta.id;meta.mainchar2MASS2MASS catalog identifiermeta.idcharRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainJmag? 2MASS J band magnitudemagphot.mag;em.IR.JfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchare_Jmag? Uncertainty in Jmagmagstat.error;phot.magfloatnullableHmag? 2MASS H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? Uncertainty in Hmagmagstat.error;phot.magfloatnullableKmag? 2MASS Ks band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? Uncertainty in Kmagmagstat.error;phot.magfloatnullable3.6magSpitzer/IRAC 3.6 um band magnitudemagphot.mag;em.IR.3-4umfloate_3.6magUncertainty in 3.6magmagstat.errorfloat4.5magSpitzer/IRAC 4.5 um band magnitudemagphot.mag;em.IR.4-8umfloate_4.5magUncertainty in 4.5magmagstat.errorfloat5.8magSpitzer/IRAC 5.8 um band magnitudemagphot.flux.density;em.IR.4-8umfloate_5.8magUncertainty in 5.8magmagstat.errorfloat8.0magSpitzer/IRAC 8.0 um band magnitudemagphot.flux.density;em.IR.8-15umfloatalphaIR SED slopemeta.crypticfloate_8.0magUncertainty in 8.0magmagstat.errorfloat24mag? Spitzer/MIPS 24 um band magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_24mag? Uncertainty in 24magmagstat.errorfloatnullablee_alphaUncertainty in alphastat.error;pos.eq.rafloatClassClassificationsrc.classcharJ/ApJ/921/81/table2Optical photometry, Gaia astrometry, and estimated stellar properties of pre-main sequence stars in the Trifid nebulaMassMasssolMassphys.massfloatE_MassUpper uncertainty in Mass (1)solMassstat.error;stat.maxfloate_MassLower uncertainty in Mass (1)solMassstat.error;phys.massfloatAgeAgeMyrtime.agefloatE_AgeUpper uncertainty in Age (1)Myrstat.error;stat.maxfloate_AgeLower uncertainty in Age (1)Myrstat.error;time.agefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVPHAS+VPHAS+ DR3 identifiermeta.id;meta.mainRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainrmagApparent r band magnitude (Vega)magphot.mag;em.opt.Rfloate_rmagUncertainty in rmagmagstat.error;phot.magfloatimagApparent i band magnitude (Vega)magphot.mag;em.opt.Ifloate_imagUncertainty in imagmagstat.error;phot.magfloatHamagApparent H{alpha} band magnitudemagphot.flux;em.line.Halphafloate_HamagUncertainty in Hamagmagstat.error;phot.magfloatEWHaH{alpha} equivalent width0.1nmspect.line.eqWidthfloate_EWHaUncertainty in EWHa0.1nmstat.errorfloatpmRAGaia EDR3 proper motion along RAmas/yrpos.pm;pos.eq.rafloate_pmRAUncertainty in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEGaia EDR3 proper motion along Declinationmas/yrpos.pm;pos.eq.decfloate_pmDEUncertainty in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatPlxGaia EDR3 parallaxmaspos.parallaxfloate_PlxUncertainty in plxmasstat.error;pos.parallaxfloatJmag? 2MASS J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? Uncertainty in Jmagmagstat.error;phot.magfloatnullableHmag2MASS H band magnitudemagphot.mag;em.IR.Hfloate_HmagUncertainty in Hmagmagstat.error;phot.magfloatKmag? 2MASS Ks band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? Uncertainty in Ksmagmagstat.error;phot.magfloatnullable