J/AJ/151/126ivo://CDS.VizieR/J/AJ/151/126doi:10.26093/cds/vizier.51510126CDSSharma S.Pandey A.K.Borissova J.Ojha D.K.Ivanov V.D.Ogura K.,Kobayashi N.Kurtev R.Gopinathan M.Yadav R.K.2018-08-24T07:46:35Z2016-08-17T15:53:29ZCDS support team

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

cds-question@unistra.frstellar-associationsyoung-stellar-objectsinfrared-photometrygalaxy-classification-systemsWe carried out deep- and wide-field near- and mid-infrared observations for a sample of eight bright-rimmed clouds (BRCs). Supplemented with the Spitzer archival data, we have identified and classified 44 to 433 young stellar objects (YSOs) associated with these BRCs. The Class I sources are generally located toward the places with higher extinction and are relatively closer to each other than the Class II sources, confirming that the young protostars are usually found in regions with denser molecular material. On the other hand the comparatively older population, Class II objects, are more randomly found throughout the regions, which can be due to their dynamical evolution. Using the minimal sampling tree analyses, we have extracted 13 stellar cores of eight or more members, which contain 60% of the total YSOs. The typical core is ~0.6pc in radii and somewhat elongated (aspect ratio of 1.45), of relatively low stellar density (surface density 60pc^-2^), consisting of a small (35) number of YSOs of relatively young sources (66% Class I), and partially embedded (median A_K_=1.1mag). But the cores show a wide range in their mass distribution (~20 to 2400M_{Sun}_), with a median value of around 130M_{Sun}_. We found the star-formation efficiencies in the cores to be between 3% and 30% with an average of ~14%, which agrees with the efficiencies needed to link the core mass function to the initial mass function. We also found a linear relation between the density of the clouds and the number of YSOs. The peaked nearest neighbor spacing distributions of the YSOs and the ratio of Jeans lengths to the YSO separations indicates a significant degree of non-thermally driven fragmentation in these BRCs.2016AJ....151..126Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/151/126CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/443/1614 : YSOs in BRC 5, 7 and 39 (Panwar+, 2014)J/MNRAS/396/964 : T Tauri in and around bright-rimmed clouds (Chauhan+, 2009)J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)J/AJ/135/2323 : H{alpha} stars and HH objects near BRCs (Ikeda+, 2008)J/PASJ/51/791 : Molecular clouds in southern HII regions (Yamaguchi+ 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/151/126https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/151/126http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/151/126https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/151/126https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/151/126http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/151/126GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/151/126/table1 (Regions observed in the present study)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/151/126/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/151/126/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/151/126/table1?GETtext/xml+votable180.050000true128.882083-40.6411110.005555555555555556Cone search capability for table J/AJ/151/126/table3 (YSOs identified on the basis of their excess IR-emission using CTIO/Spitzer data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/151/126/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/151/126/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/151/126/table3?GETtext/xml+votable180.050000true128.9179167-40.66866670.005555555555555556Cone search capability for table J/AJ/151/126/subgroups (Center coordinates (table 4), and properties (table 5) of the identified cores and active regions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/151/126/subgroups?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/151/126/subgroups?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/151/126/subgroups?GETtext/xml+votable180.050000true128.869167-40.6416670.0055555555555555566/6094 6137 6477 6478 6479 6488 9943 10023 11349 37897 37938 39259 39282 41813 42212 425162.0616683193919197e-20 6.185923063528282e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/151/126?format=asciiInfraredOpticaldefaultJ/AJ/151/126/table1Regions observed in the present studyNYNumber of YSOs identified in the present study (table3)meta.numberintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the region observed (1)meta.id;meta.maincharprimaryNregNumber of cores and active regions identified (tables 4-5)meta.numberintnullableRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainGLONGalactic longitude (l)degpos.galactic.lonGLATGalactic latitude (b)degpos.galactic.latdoubleDist[0.95/2.8]? Heliocentric distance (2)kpcpos.distancefloatnullablepix[0.0014/0.0041]? Pixel sizepcsrc.morph.scLengthfloatnullableMass1[0.03/0.8]? Stellar mass at the 90% completeness limit of Young Stellar Object (YSO) detection (3)solMassphys.massfloatnullableMass2[0.1/3]? Stellar mass at the 90% completeness limit of YSO detection (4)solMassphys.massfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/AJ/151/126/table3YSOs identified on the basis of their excess IR-emission using CTIO/Spitzer datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the Bright-Rimmed Cloud (BRC)meta.id.part;meta.maincharYSO[1/433] Identifier of the Young Stellar Objectmeta.id.part;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainJmag[5.417/19.505]? CTIO Blanco/ISPI J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag[0.002/0.198]? Uncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag[4.601/19.398]? CTIO Blanco/ISPI H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0.002/0.237]? Uncertainty in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag[4.16/17.819]? CTIO Blanco/ISPI K band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag[0.002/0.29]? Uncertainty in Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable[3.6][6.4/15.6]? Spitzer/IRAC 3.6{mu}m band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6][0.02/0.2]? Uncertainty in [3.6]magstat.errorfloatnullable[4.5][5.4/14.9]? Spitzer/IRAC 4.5{mu}m band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.5][0.01/0.2]? Uncertainty in [4.5]magstat.errorfloatnullable[5.8][4.5/13.2]? Spitzer/IRAC 5.8{mu}m band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.8][0.01/0.2]? Uncertainty in [5.8]magstat.errorfloatnullable[8.0][3.3/13.2]? Spitzer/IRAC 8.0{mu}m band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0][0.006/0.2]? Uncertainty in [8.0]magstat.errorfloatnullableCl[1/4]? First classification flag (1-4) (1)meta.code.classintnullableII[5]? Flag "5"=class II through CTIO data) (1)meta.code.classintnullableI[6]? Flag "6"=class I through CTIO data) (1)meta.code.classintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/AJ/151/126/subgroupsCenter coordinates (table 4), and properties (table 5) of the identified cores and active regionsNYSO[8/269] Number of Young Stellar Objects (YSOs)meta.numberintNI1[0/181] Number of class I YSOsmeta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the Bright-Rimmed Cloud (BRC)meta.id.part;meta.maincharRegC#=core, A=active regionmeta.id.part;meta.maincharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainNI2[0/12] Number of class I YSOs (classified by using the Spitzer/IRAC data)meta.numberintNII1[1/88] Number of class II YSOsmeta.numberintNII2[0/45] Number of class II YSOs (classified by using the Spitzer/IRAC data)meta.numberintFI1[38/91]? Class I YSOs fraction (NI1/NYSO*100) (1)%stat.fit.paramintnullableFI2[0/50]? Class I YSOs fraction by using the Spitzer/IRAC data (NI2/(NI2+NII2))%stat.fit.paramintnullableRhull[0.18/2.63] The hull radius (2)pcphys.size.radiusfloatRcir[0.24/3.22] The circle radius (3)pcphys.size.radiusfloatRatio[0.89/2.36] Aspect ratio (4)pos.distance;arith.ratiofloat<rho>[4.2/331.9] Mean stellar surface density ({rho}_mean_) (5)pc**-2src.density;stat.meanfloatrpk[17/1330.4] Peak stellar surface density ({rho}_peak_) (5)pc**-2src.density;stat.maxfloat<MST>[0.04/0.32] Mean Minimal Sampling Tree (MST) branch length (6)pcpos.distancefloat<NN2>[0.03/0.15] Mean Nearest Neighbor (NN) distancepcpos.distancefloat<AK>[0.42/1.64] The mean extinction value (A_Kmean_)magphys.absorptionfloatAK[0.86/2.84] The peak extinction value (A_Kpeak_)magphys.absorptionfloatMhull[19.8/5286.7] The cloud mass in the convex hull derived using the extinction mapssolMassphys.massfloatM0.8[2.2/4601.4] The mass of the dense cloud with A_K_ greater that 0.8mag (7)solMassphys.massfloatQ[0.55/0.85] The structural Q parameter value (8)pos.distance;arith.ratiofloatJ[0.23/1.21] The Jeans length ({lambda}_J_) (9)pcpos.distance;phys.sizefloatDcrit[0.12/0.84] The critical branch length for Minimal Sampling Tree (MST) (D_crit._)pcpos.distancefloat