J/ApJ/549/441ivo://CDS.VizieR/J/ApJ/549/441doi:10.26093/cds/vizier.15490441CDSSchulz N.S.Canizares C.Huenemoerder D.Kastner J.H.Taylor S.C.,Bergstroem E.J.2001-06-09T21:09:03Z2001-06-09T21:08:59ZCDS support team

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

cds-question@unistra.fropen-star-clustersx-ray-sourcesastronomical-object-identificationWe used the High-Energy Transmission Grating Spectrometer on board the Chandra X-Ray Observatory to perform two observations, separated by 3 weeks, of the Orion Trapezium region. The zeroth-order images on the Advanced CCD Imaging Spectrometer provide spatial resolution of 0.5" and moderate energy resolution. Within a 160"x140" region around the Orion Trapezium, we resolve 111 X-ray sources with luminosities between 7x10^28^ and 2x10^32^ergs/s. We do not detect any diffuse emission. All but six sources are identified.2001ApJ...549..441Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/549/441CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/117/1375 : Orion Trapezium cluster (Simon+, 1999)J/A+A/299/39 : Orion Trapezium area ROSAT PSPC obs. I. (Geier+, 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/549/441https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/549/441http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/549/441https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/549/441https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/549/441http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/549/441GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/549/441/table1 (Source positions, count rates and identifications)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/549/441/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/549/441/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/549/441/table1?GETtext/xml+votable180.050000true83.8159167-5.3872750.005555555555555556Chandra6/21439https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/549/441?format=asciiX-raydefaultJ/ApJ/549/441/table1Source positions, count rates and identificationsNamesIdentificationmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[SCH2001]Source designationmeta.id;meta.maincharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination sign (J2000.0)pos.eq.dec;meta.mainTotalCountTotal counts (1999 October plus November)ctphot.count;em.X-rayintCR10? October count rate0.001count.s**-1phot.count;em.X-rayfloatnullableCR11? November count rate0.001count.s**-1phot.count;em.X-rayfloatnullable