J/PASJ/55/635ivo://CDS.VizieR/J/PASJ/55/635doi:10.26093/cds/vizier/bj-1q-kvCDSNakajima H.Imanishi K.Takagi S.Koyama K.Tsujimoto M.2026-03-17T20:04:20Z2009-05-28T12:38:27ZCDS support team

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

cds-question@unistra.frmolecular-cloudsx-ray-sourcesinfrared-sourcesyoung-stellar-objectsWe report on the results of the Chandra ACIS-I observation on the central region of the Monoceros R2 cloud (Mon R2), a high-mass star-forming region (SFR) at a distance of 830pc. With a deep exposure of ~100ks, we detected 368 X-ray sources, ~80% of which were identified with the near-infrared (NIR) counterparts. We systematically analyzed the spectra and time variability of most of the X-ray emitting sources and provided a comprehensive X-ray source catalog for the first time. Using the J-, H- and K-bands magnitudes of the NIR counterparts, we estimated the evolutionary phase (classical T Tauri stars and weak-lined T Tauri stars) and the mass of the X-ray emitting sources, and analyzed the X-ray properties as a function of the age and mass.2003PASJ...55..635Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASJ/55/635CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 2002)II/241 : 2MASS Catalog Intermediate Data Release (IPAC/UMass, 2000)J/ApJ/567/423 : CHANDRA obs. of YSOs in Monoceros R2 (Kohno+, 2002)J/AJ/114/198 : The Monoceros R2 Cluster (Carpenter+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASJ/55/635https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASJ/55/635http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASJ/55/635https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASJ/55/635https://vizier.iucaa.in/viz-bin/votable?-source=J/PASJ/55/635http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASJ/55/635GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PASJ/55/635/table1 (Chandra X-ray sources and stellar counterparts)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASJ/55/635/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/PASJ/55/635/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASJ/55/635/table1?GETtext/xml+votable180.050000true91.8061667-6.33519440.0055555555555555566/21447 21458https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASJ/55/635?format=asciiX-rayInfrareddefaultJ/PASJ/55/635/table1Chandra X-ray sources and stellar counterpartsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[NIT2003]Sequential numbermeta.recordintRAJ2000Right ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (1)pos.eq.dec;meta.mainCountBackground-subtracted X-ray photon counts in the 0.5-10.0keV band.ctphot.count;em.X-rayfloatXIDX-ray identification (2)meta.id;meta.maincharNIRIDNIR identification (3)meta.id.crosschar2MASSDisplay the nearby 2MASS source (up to 5")meta.ref.urlchar