OMC2P3CXO ivo://nasa.heasarc/omc2p3cxo NASA/GSFC HEASARC Tsujimoto et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The OMC-2 and OMC-3 Chandra X-Ray Point Source Catalog contains the results of the Chandra X-ray observation of Orion Molecular Clouds 2 and 3 (OMC-2 and OMC-3). A deep exposure of ~100 ks detects ~400 X-ray sources in the field of view (FOV) of the ACIS array, providing one of the largest X-ray catalogs in a star-forming region as of the date that this was published (February 2002). Coherent studies of the source detection, time variability, and energy spectra were performed. The authors classified the X-ray sources into Class I, Class II, and Class III+MS types based on the J-, H-, and K-band colors of their near-infrared counterparts, and discussed the X-ray properties (temperature, absorption, and time variability) along these evolutionary phases. The results of the X-ray imaging analysis and a correlation with the 2MASS Catalog are given for all the detected X-ray sources. Notice that the sources '[TKT2002] I1' - '[TKT2002] I354' and '[TKT2002] S1' - '[TKT2002] S11' were detected in the total-band image (0.5 - 8.0 keV) images of the ACIS-I and the ACIS-S2 CCDs, respectively, but that source '[TKT2002] I355' - '[TKT2002] I369' and '[TKT2002] S12' - '[TKT2002] S13' were detected only in the hard-band (2.0 - 8.0 keV) images of the ACIS-I and the ACIS-S2 CCDs, and '[TKT2002] I370' - '[TKT2002] I385' were detected only in the soft-band (0.5 - 2.0 keV) image of the ACIS-I. No new source was detected in the soft band image of the ACIS-S2 CCD. This table was created by the HEASARC in January 2007 based on CDS table J/ApJ/566/974, files table1.dat and table2.dat. This is a service provided by NASA HEASARC . 2003ApJ...585..602T https://heasarc.gsfc.nasa.gov/W3Browse/all/omc2p3cxo.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=omc2p3cxo& GET text/xml 180 99999 true 83.8875 -5.29230556 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=omc2p3cxo GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_omc2p3cxo&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 Infrared X-ray public omc2p3cxo OMC-2 and OMC-3 Chandra X-Ray Point Source Catalog name Object Designation (CXOU Jhhmmss.ss-ddmmss.s) meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable counts X-Ray Photon Counts in 0.5-8.0 keV Band ct phot;em.X-ray int nullable hardness_ratio Hardness Ratio phot.flux;arith.ratio;em.X-ray double nullable lx X-Ray Luminosity (erg/s) erg/s double nullable lx_lower Lower 1-Sigma Confidence Level to X-Ray Luminosity erg/s double nullable lx_upper Upper 1-Sigma Confidence Level to X-Ray Luminosity erg/s double nullable broad_class Classification Based on J, H, K_s_ Magnitude of 2MASS Counterpart char nullable lii Galactic Longitude degree pos.galactic.lon double nullable metallicity Metallicity Relative to Solar Photospheric (in Units of Solar Metallicity) Solar double nullable te_plasma_upper Upper 1-Sigma Confidence Level to Temperature keV double nullable bii Galactic Latitude degree pos.galactic.lat double nullable nh_upper Upper 1-Sigma Confidence Level to NH H-atoms/cm^2 double nullable upper_probability Upper Probability double nullable alt_name Alternate Object Designation meta.id char nullable te_plasma_lower Lower 1-Sigma Confidence Level to Temperature keV double nullable nh_lower Lower 1-Sigma Confidence Level to NH H-atoms/cm^2 double nullable jh_color The (J-H) Color mag double nullable metallicity_lower Lower 1-Sigma Confidence Level to Z Solar double nullable metallicity_upper Upper 1-Sigma Confidence Level to Z Solar double nullable te_plasma Temperature (keV) keV double nullable hk_color The (H-K) Color mag double nullable source_number Catalog Object Identification Number meta.id char nullable nh Hydrogen Column Density H-atoms/cm^2 phys.columnDensity double nullable variable_flag Flag [d] Indicates Source with Time-Variability char nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable