J/PASJ/55/653ivo://CDS.VizieR/J/PASJ/55/653doi:10.26093/cds/vizier/bj-1q-mdCDSImanishi K.Nakajima H.Tsujimoto M.Koyama K.Tsuboi Y.2026-03-17T20:04:21Z2006-06-03T11:30:41ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectspre-main-sequence-starsstellar-flaresx-ray-sourcesWe report on the results of a systematic study of X-ray flares from low-mass young stellar objects, using two deep exposure Chandra observations of the main region of the {rho} Ophiuchi star-forming cloud. From 195 X-ray sources, including class I-III sources and some young brown dwarfs, we detected a total of 71 X-ray flares.2003PASJ...55..653Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASJ/55/653CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-)J/A+A/359/113 : X-ray and IR study of Rho Oph dark cloud (Grosso+, 2000)J/ApJ/438/813 : Stellar population in {rho} Oph cloud core (Strom+, 1995)J/ApJ/630/381 : Mid-IR imaging in {rho} Oph (Barsony+, 2005)J/ApJS/112/109 : Rho Oph Near IR Positions and Photometry (Barsony+, 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASJ/55/653https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASJ/55/653http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASJ/55/653https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASJ/55/653https://vizier.iucaa.in/viz-bin/votable?-source=J/PASJ/55/653http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASJ/55/653GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PASJ/55/653/table2 (Chandra X-ray sources in the rho Oph region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASJ/55/653/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/PASJ/55/653/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASJ/55/653/table2?GETtext/xml+votable180.050000true246.4800833-24.42702780.0055555555555555566/42981https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASJ/55/653?format=asciiX-raydefaultJ/PASJ/55/653/table2Chandra X-ray sources in the rho Oph regionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[INT2003]Source designation (G1) (1)meta.id;meta.maincharprimaryn_[INT2003]Note on [INT2003] (2)meta.notecharCountBackground-subtracted ACIS-I counts (3)ctphot.count;em.X-rayfloatn_CountNote on Count (4)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainl_<kT>Limit flag on <kT>meta.code.error;phys.energychar<kT>? Time-averaged temperaturekeVphys.temperaturefloatnullablel_kTlLimit flag on kTlmeta.code.errorcharkTl? 90% confidence lower limit of kTkeVphys.temperaturefloatnullablekTu? 90% confidence upper limit of kTkeVphys.temperaturefloatnullablen_<kT>[f] f for fixedmeta.notecharlog<EM>? Mean emission measurelog(cm**-3)phys.emissMeasure;stat.meanfloatnullablel_logEMlLimit flag on logEMlmeta.code.errorcharlogEMl? 90% confidence lower limit of logEMlog(cm**-3)stat.error;stat.fit.paramfloatnullablelogEMu? 90% confidence upper limit of logEMlog(cm**-3)stat.error;stat.fit.paramfloatnullableNH? Absorption hydrogen column density1e+22cm**-2phys.columnDensityfloatnullablel_NHlLimit flag on NHlmeta.code.errorcharNHl? 90% confidence lower limit of NH1e+22cm**-2stat.error;stat.fit.paramfloatnullableNHu? 90% confidence upper limit of NH1e+22cm**-2stat.error;stat.fit.paramfloatnullableFlux? Observed flux in 0.5-9.0keV1e-17W.m**-2phot.flux;em.X-rayfloatnullable<LX>? Mean absorption-corrected X-ray luminosity in 0.5-9.0keV1e+22Wphys.luminosity;em.X-raydoublenullableChi2? Reduced {chi}^2^ for the spectral fittingsstat.fit.chi2floatnullableDOF? Degree of freedomstat.fit.dofintnullableComCommentsmeta.notecharJ/PASJ/55/653/table3Identifications of the X-ray sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[INT2003]Source designation (G1)meta.id;meta.maincharo2MASS? Offset between the Chandra and nearest 2MASS sources (Cat. II/246)arcsecpos;arith.difffloatnullablen_o2MASS[(R)# ] Note on o2MASS (2)meta.notecharRNamesRadio source names, separated by comma (3)meta.idcharPSPCX-ray source detected by ROSAT/PSPC (Casanova et al., 1995ApJ...439..752C, ROXR1 NN or ROXR1 CNN)phot.count;em.X-raycharHRIX-ray source detected by ROSAT/HRI (Grosso et al., 2000, Cat. <J/A+A/359/113>, ROXRA NN or ROXRF NN)meta.idcharn_HRI[*] From Grosso (2001A&A...370L..22G)meta.notecharASCAX-ray source detected by ASCA (Katama et al., 1997PASJ...49..461K, ROXA NNA or ROXA CN)meta.idcharn_ASCA[+] +: From Tsuboi et al., 2000ApJ...532.1089Tmeta.notechar[IKT2001]? Chandra sources already listed in Paper I, Imanishi et al., 2001ApJ...557..747Imeta.idintnullableONamesOther names (4)meta.idcharn_ONames[+S] Note on ONames (5)meta.notecharClassClassification of the source (6)src.classcharn_Class[a] a: From NIR spectroscopy (7)meta.notechar