J/ApJ/582/382ivo://CDS.VizieR/J/ApJ/582/382doi:10.26093/cds/vizier.15820382CDSFlaccomio E.Damiani F.Micela G.Sciortino S.Harnden F.R.Jr,Murray S.S.Wolk S.J.2010-10-05T10:50:13Z2003-08-05T22:13:42ZCDS support team

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

cds-question@unistra.fropen-star-clustersx-ray-sourcesIn this first of two companion papers on the Orion Nebula Cluster (ONC), we present our analysis of a 63ks Chandra HRC-I observation that yielded 742 X-ray detections within the 30'x30' field of view. To facilitate our interpretation of the X-ray image, here we collect a multiwavelength catalog of nearly 2900 known objects in the region by combining 17 different catalogs from the recent literature. We define two reference groups: an infrared sample, containing all objects detected in the K band, and an optical sample comprising low-extinction, well-characterized ONC members. We show for both samples that field object contamination is generally low. Our X-ray sources are primarily low-mass ONC members. The detection rate for optical sample stars increases monotonically with stellar mass from zero at the brown dwarf limit to ~100% for the most massive stars but shows a pronounced dip between 2 and 10M_{sun}_. We determine L_X_ and L_X_/L_bol_ or all stars in our optical sample and utilize this information in our companion paper to study correlations between X-ray activity and other stellar parameters.2003ApJ...582..382Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/582/382CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997)J/AJ/120/1426 : Chandra sources in ONC + BN-KL (Garmire+, 2000)J/AJ/125/1537 : QUIRC Chandra sources in OMC 2/3 (Tsujimoto+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/582/382https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/582/382http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/582/382https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/582/382https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/582/382http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/582/382GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/582/382/table1 (X-ray sources detected in the Orion Nebula Cluster)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/582/382/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/582/382/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/582/382/table1?GETtext/xml+votable180.050000true83.56025-5.47128330.005555555555555556Cone search capability for table J/ApJ/582/382/table4 (Catalog of the ONC optical sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/582/382/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/582/382/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/582/382/table4?GETtext/xml+votable180.050000true83.553375-5.48007780.005555555555555556Chandra6/21438 21439 22804 22805https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/582/382?format=asciiX-raydefaultJ/ApJ/582/382/table1X-ray sources detected in the Orion Nebula ClusterrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXseqX-ray source number ([FDM2003] X NNN in Simbad)meta.idintRAJ2000Source hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Source degree of Declination (J2000)pos.eq.dec;meta.maine_PosStatistical uncertainty in RA and DEarcsecstat.errorfloatS/NDetection signal-to-noise ratiostat.snrfloatCtsX-ray countsctphot.count;em.X-raydoublee_CtsUncertainty in Ctsctstat.errorfloatExpEffective exposure time (1)kstime.duration;obs.exposurefloatXlistClose Optical sources in table4meta.ref.urlcharJ/ApJ/582/382/table4Catalog of the ONC optical samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintOseqReference number ([FDM2003] Opt NNN in Simbad)meta.idintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainMassMasssolMassphys.massfloatlogAge? Log of the Agelog(yr)time.agefloatnullableProt? Rotation perioddtime.periodfloatnullableEW? Ca II 8542{AA} equivalent width (1)0.1nmspect.line.eqWidthfloatnullablel_CRateLimit flag on CRatemeta.code.errorcharCRateBasal HRC Count Ratect/ksphot.count;em.X-rayfloatl_logXLumLimit flag on XLummeta.code.errorcharlogXLumLog of the X-ray luminositylog(1e-07W)phys.luminosity;em.X-rayfloatl_logX/bolLimit flag on X/bolmeta.code.errorcharlogX/bol? Log of the X-ray to bolometric luminosity ratiophys.luminosity;arith.ratiofloatnullableXlistClose X-ray sources in table1meta.ref.urlcharJ/ApJ/582/382/table2List of Catalogs in the ONC AreaRefReferencemeta.ref;pos.framecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStudyType of studymeta.ref;pos.framecharTableaNumber of the table in the original publicationmeta.id;meta.maincharNumberNumber of sources in the HRC field of viewmeta.numberintR95? The 95% quantiles of the object distances from the Jones & Walker 1988AJ.....95.1755J counterparts.arcsecpos.angDistancefloatnullableNR? Number of objects used to derive R95, i.e., identified with Jones & Walker 1988AJ.....95.1755Jmeta.numberintnullableNHRC? Number of objects identified with an HRC X-ray sourcemeta.numberintnullableDataData collected from each catalog; superscripts give precedence for acceptance in our catalogmeta.note