J/MNRAS/443/3218ivo://CDS.VizieR/J/MNRAS/443/3218doi:10.26093/cds/vizier.74433218CDSMallick K.K.Ojha D.K.Tamura M.Pandey A.K.Dib S.Ghosh S.K.,Sunada K.Zinchenko I.Pirogov L.Tsujimoto M.2024-08-10T20:18:22Z2015-07-28T15:12:04ZCDS support team

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

cds-question@unistra.frinfrared-sourcesx-ray-sourcesinfrared-photometryWe present deep and high-resolution (FWHM~0.4-arcsec) near-infrared (NIR) imaging observations of the NGC 7538 IRS 1-3 region (in JHK bands), and IRS 9 region (in HK bands) using the 8.2m Subaru telescope. The NIR analysis is complemented with Giant Metrewave Radio Telescope (GMRT) low-frequency observations at 325, 610, and 1280MHz, molecular line observations of H^13^CO^+^ (J=1-0), and archival Chandra X-ray observations. Using the 'J-H/H-K' diagram, 144 Class II and 24 Class I young stellar object (YSO) candidates are identified in the IRS 1-3 region. Further analysis using 'K/H-K' diagram yields 145 and 96 red sources in the IRS 1-3 and IRS 9 regions, respectively. A total of 27 sources are found to have X-ray counterparts. The YSO mass function (MF), constructed using a theoretical mass-luminosity relation, shows peaks at substellar (~0.08-0.18M_{sun}_) and intermediate (~1-1.78M_{sun}_) mass ranges for the IRS 1-3 region. The MF can be fitted by a power law in the low-mass regime with a slope of {Gamma} ~0.54-0.75, which is much shallower than the Salpeter value of 1.35. An upper limit of 10.2 is obtained for the star to brown dwarf ratio in the IRS 1-3 region. GMRT maps show a compact HII region associated with the IRS 1-3 sources, whose spectral index of 0.87+/-0.11 suggests optical thickness. This compact region is resolved into three separate peaks in higher resolution 1280MHz map, and the 'east' subpeak coincides with the IRS 2 source. H^13^CO^+^ (J=1-0) emission reveals peaks in both IRS 1-3 and IRS 9 regions, none of which are coincident with visible nebular emission, suggesting the presence of dense cloud nearby. The virial masses are approximately of the order of 1000 and 500M_{sun}_ for the clumps in IRS 1-3 and IRS 9 regions, respectively.2014MNRAS.443.3218Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/443/3218CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/696/471 : MIR spectroscopy of NGC 7538 IRS 1 (Knez+, 2009)J/A+A/543/A88 : NGC 7538 IRS1 and NGC 7538S 1.36mm maps (Beuther+, 2012)J/A+A/558/A81 : NGC 7538 IRS1 maps in CH3OH, HCN and HCO+ (Beuther+, 2013)J/A+A/567/A116 : Maps and datacubes of NGC 7538 IRS 1 (Frau+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/443/3218https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/443/3218http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/443/3218https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/443/3218https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/443/3218http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/443/3218GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/443/3218/table3 (X-ray sources with NIR counterparts in the NIR FoV)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/443/3218/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/443/3218/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/443/3218/table3?GETtext/xml+votable180.050000true348.4001661161.468476110.005555555555555556Cone search capability for table J/MNRAS/443/3218/YSOs (Near-IR photometry of YSOs in the fields of IRS 1-3 abd 9 (tables 4 and 5))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/443/3218/YSOs?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/443/3218/YSOs?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/443/3218/YSOs?GETtext/xml+votable180.050000true348.3980161.483756940.0055555555555555566/143177.952274030004205e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/443/3218?format=asciiX-rayInfrareddefaultJ/MNRAS/443/3218/table3X-ray sources with NIR counterparts in the NIR FoVrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXNameIAU designation (HHMMSS.ss+DDMMSS.s, J2000)meta.id;meta.maincharprimaryRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainNct[3.8/88] Net counts extracted (0.5-8keV)ctphot.count;em.X-rayfloatEmed[1.9/5] Background-corrected median photon energy (total band)keVem.energyfloatlogNHs[21.2/23.2] H column density calculated using XSPEClog(cm**-2)phys.columnDensity;meta.modelledfloatkT1[0.5/9.6] Plasma temperature calculated using XSPECkeVphys.temperature;meta.modelledfloatlogLh1Apparent hard band luminositylog(1e-07W)phys.luminosity;em.X-rayfloatlogLt1Apparent total band luminositylog(1e-07W)phys.luminosity;em.X-rayfloatlogLhc1Intrinsic hard band luminositylog(1e-07W)phys.luminosity;em.X-rayfloatlogLtc1Intrinsic total band luminositylog(1e-07W)phys.luminosity;em.X-rayfloatlogLhc2? Intrinsic hard band luminosity calculated using Xphotlog(1e-07W)phys.luminosity;em.X-rayfloatnullablelogLtc2? Intrinsic total band luminosity calculated using Xphotlog(1e-07W)phys.luminosity;em.X-rayfloatnullablelogNHp[21.1/23.5]? H column density calculated using Xphotlog(cm**-2)phys.columnDensity;meta.modelledfloatnullableJ/MNRAS/443/3218/YSOsNear-IR photometry of YSOs in the fields of IRS 1-3 abd 9 (tables 4 and 5)DEJ2000Declination (J2000)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTSimbad column added by the CDSmeta.id;meta.datasetcharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainJmag? J magnitude (only in table4)magphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmag (for IRS 1-3 field)magstat.error;phot.mag;em.IR.JfloatnullableHmag? H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag? K magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.KfloatnullableYSOYSO classification (for IRS 1-3 field)src.classcharXNameX-ray IAU designation (HHMMSS.ss+DDMMSS.s)meta.idchar