J/AJ/155/241ivo://CDS.VizieR/J/AJ/155/241doi:10.26093/cds/vizier.51550241CDSWinston E.Wolk S.J.Gutermuth R.Bourke T.L.2021-02-18T07:49:31Z2019-01-14T09:56:21ZCDS support team

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

cds-question@unistra.frstar-forming-regionsyoung-stellar-objectspre-main-sequence-starsx-ray-sourcesinfrared-photometryWe present a Chandra study of the deeply embedded Serpens South star-forming region, examining cluster structure and disk properties at the earliest stages. In total, 152 X-ray sources are detected. Combined with Spitzer and 2MASS photometry, 66 X-ray sources are reliably matched to an IR counterpart. We identify 21 class I, 6 flat spectrum, 16 class II, and 18 class III young stars; 5 were unclassified. Eighteen sources were variable in X-rays, 8 exhibiting flare-like emission and one source being periodic. The cluster's X-ray luminosity distance was estimated: the best match was to the nearer distance of 260 pc for the front of the Aquila Rift complex. The ratio of N_H_ to A_K_ is found to be ~0.68x10^22^, similar to that measured in other young low-mass regions, but lower than that measured in the interstellar medium and high-mass clusters (~(1.6-2)x10^22^). We find that the spatial distribution closely follows that of the dense filament from which the stars have formed, with the class II population still strongly associated with the filament. There are four subclusters in the field, with three forming knots in the filament, and a fourth to the west, which may not be associated but may be contributing to the distributed class III population. A high percentage of diskless class IIIs (upper limit 30% of classified X-ray sources) in such a young cluster could indicate that processing of disks is influenced by the cluster environment and is not solely dependent on timescale.2018AJ....155..241Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/155/241CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)J/A+A/463/275 : Chandra obs. of Serpens star-forming region (Giardino+, 2007)J/ApJ/663/1149 : Spitzer survey of Serpens YSO population (Harvey+, 2007)J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)J/AJ/149/103 : Spectroscopy of candidate YSOs in Serpens (Erickson+, 2015)J/ApJ/805/9 : Gould's Belt VLA Survey. II. Serpens regionJ/A+A/463/275 : Chandra obs. of Serpens star-forming region (Giardino+, 2007)J/A+A/615/A9 : Distribution of Serpens South protostars (Plunkett+, 2018)J/AJ/155/99 : IR variability among YSOs in the Serpens South clusterhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/155/241https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/155/241http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/155/241https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/155/241https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/155/241http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/155/241GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/155/241/table2 (Chandra X-ray detections)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/155/241/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/155/241/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/155/241/table2?GETtext/xml+votable180.050000true277.316570833-2.1434505560.005555555555555556Cone search capability for table J/AJ/155/241/table4 (IR properties of identified YSOs in Serpens South IR-field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/155/241/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/155/241/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/155/241/table4?GETtext/xml+votable180.050000true277.3132-2.2192023890.0055555555555555566/30341 303436.772611666688002e-21 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/155/241?format=asciiX-rayInfrareddefaultJ/AJ/155/241/table2Chandra X-ray detectionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/152] Chandra index numbermeta.id;meta.mainintf_ID[IR] Infrared source counterpart flag (1)meta.codecharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainSigni[0.23/32.27]? Source significancestat.fit.goodnessfloatnullableOff[0.05/18.18] Off axis angledeginstr.offsetfloatNCts[-22.57/1047.91] Net countsctphot.count;em.X-rayfloate_NCts[1.73/32.4] Uncertainty in NCtsctstat.errorfloatNH[0.13/42.28]? H I column density1e+22cm**-2phys.columnDensityfloatnullablee_NH[0.03/9.39]? Lower uncertainty in NH1e+22cm**-2stat.error;stat.minfloatnullableE_NH[0.03/9.39]? Upper uncertainty in NH1e+22cm**-2stat.error;stat.maxfloatnullablekT[0.24/64]? Plasma temperaturekeVphys.temperaturefloatnullablee_kT[0.03/43.64]? Lower uncertainty in kTkeVstat.error;stat.minfloatnullableE_kT[0.03/175.5]? Upper uncertainty in kTkeVstat.error;stat.maxfloatnullableAbsFX[1.83e-41/3.25e-13]? Absorbed X-ray flux (2)mW.m**-2phot.flux;em.X-raydoublenullablee_AbsFX[1.48e-15/3.09e-13]? Uncertainty in AbsFX (2)mW.m**-2stat.errordoublenullableFX[1.54e-29/7.21e-06]? Corrected, unabsorbed X-ray flux (2)mW.m**-2phot.flux;em.X-raydoublenullablee_FX[1.11e-15/3.08e-13]? Uncertainty in FX (2)mW.m**-2stat.errordoublenullableVarVariable flag (3)meta.code;src.varcharJ/AJ/155/241/table3Infrared photometry of X-ray detections in Serpens Southe_Jmag[0.02/0.14]? Uncertainty in Jmagmagstat.error;phot.magfloatnullableHmag[8.66/15.79]? 2MASS H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0.02/0.18]? Uncertainty in Hmagmagstat.error;phot.magfloatnullableKsmag[8.56/15.05]? 2MASS K_s_ band magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag[0.02/0.17]? Uncertainty in Ksmagmagstat.error;phot.magfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/152] Chandra index numbermeta.id;meta.mainintJmag[8.93/16.43]? 2MASS J band magnitudemagphot.mag;em.IR.Jfloatnullable3.6mag[6.19/16.21]? Spitzer/IRAC 3.6 micron band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_3.6mag[0/0.27]? Uncertainty in 3.6magmagstat.errorfloatnullable4.5mag[5/16.42]? Spitzer/IRAC 4.5 micron band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_4.5mag[0/0.19]? Uncertainty in 4.5magmagstat.errorfloatnullable5.8mag[4.05/15.15]? Spitzer/IRAC 5.8 micron band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_5.8mag[0/0.36]? Uncertainty in 5.8magmagstat.errorfloatnullable8.0mag[3.39/15.95]? Spitzer/IRAC 8.0 micron band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_8.0mag[0/1.91]? Uncertainty in 8.0magmagstat.errorfloatnullable24mag[0.58/8.48]? Spitzer/MIPS 24 micron band magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_24mag[0/0.17]? Uncertainty in 24magmagstat.errorfloatnullableAK[0.0189474/8.34302]? K band extinctionmagphys.absorptiondoublenullableSClassSED classification; see Section 3.1 (1)src.classcharCClass[-100/99]? Color classification; see Section 3.1 (G1)src.class.colorintnullableJ/AJ/155/241/table4IR properties of identified YSOs in Serpens South IR-fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/299] Spitzer/IRAC index numbermeta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainJmag[10.43/17.21]? 2MASS J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag[0.02/0.27]? Uncertainty in Jmagmagstat.error;phot.magfloatnullableHmag[7.09/16.44]? 2MASS H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0.02/0.26]? Uncertainty in Hmagmagstat.error;phot.magfloatnullableKsmag[5.42/15.11]? 2MASS K_s_ band magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag[0.02/0.16]? Uncertainty in Ksmagmagstat.error;phot.magfloatnullable3.6mag[5.04/16.95]? Spitzer/IRAC 3.6 micron band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_3.6mag[0/0.16]? Uncertainty in 3.6magmagstat.errorfloatnullable4.5mag[4.66/15.01]? Spitzer/IRAC 4.5 micron band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_4.5mag[0/0.09]? Uncertainty in 4.5magmagstat.errorfloatnullable5.8mag[3.86/13.98]? Spitzer/IRAC 5.8 micron band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_5.8mag[0/0.43]? Uncertainty in 5.8magmagstat.errorfloatnullable8.0mag[3.05/13.54]? Spitzer/IRAC 8.0 micron band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_8.0mag[0/0.78]? Uncertainty in 8.0magmagstat.errorfloatnullable24mag[0.58/9.83]? Spitzer/MIPS 24 micron band magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_24mag[0/0.53]? Uncertainty in 24magmagstat.errorfloatnullableAK[0.0280822/8.34302]? K band extinctionmagphys.absorptiondoublenullableCClass[0/3]? Color classification; see Section 3.1 (G1)src.class.colorintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar