COLL69XMM ivo://nasa.heasarc/coll69xmm NASA/GSFC HEASARC Barrado et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains some of the results from the first paper of a series devoted to the Lambda Orionis star-forming region, Orion's Head, from the X-ray perspective. The final aim of this research is to provide a comprehensive view of this complex region, which includes several distinct associations and dark clouds. The authors aim to uncover the population of the central, young star cluster Collinder 69, and in particular to find those diskless Class III pre-main sequence objects which have not been identified by previous surveys based on near- and mid-infrared searches, and to establish the X-ray luminosity function for the association. The authors have combined two exposures taken with the XMM-Newton satellite with an exhaustive data set of optical, near- and mid-infrared photometry to assess the membership of the X-ray sources based on different color-color and color-magnitude diagrams, as well as other properties, such as effective temperatures, masses and bolometric luminosities derived from spectral energy distribution fitting and comparison with theoretical isochrones. The presence of circumstellar disks is discussed using mid-infrared photometry from the Spitzer Space Telescope. This table contains the XMM-Newton X-ray point source catalog for all sources detected in the EPIC observations of the Collinder 69, East and West Fields (C69E and C69W), respectively, with maximum likelihood (ML) values > 15.0. A companion HEASARC Browse table COLL69OID contains optical and infrared data as well as membership information on counterparts to these X-ray sources. This table was created by the HEASARC in July 2011 based on the electronic versions of Tables 3 and 4 from the reference paper which were obtained from the CDS (their catalog J/A+A/526/A21 files table3.dat and table4.dat). This is a service provided by NASA HEASARC . 2011A&A...526A..21B https://heasarc.gsfc.nasa.gov/W3Browse/all/coll69xmm.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=coll69xmm& GET text/xml 180 99999 true 84.00166667 9.68680556 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=coll69xmm GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_coll69xmm&Action=More+Options&Action=Parameter+Search&ConeAdd=1 XMM-NEWTON 0.0166666666666667 X-ray public coll69xmm Collinder 69 Cluster XMM-Newton X-Ray Point Source Catalog name Source Designation 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 error_radius Position Uncertainty (arcsec) arcsec stat.error;pos double nullable count_rate Source Count Rate ct/s phot.count;em.X-ray double nullable count_rate_error RMS Uncertainty in Source Count Rate ct/s stat.error;phot.count;em.X-ray double nullable hardness_ratio_2 Hardness Ratio 2 (HR2=(H+M-S)/(H+M+S)) phot.flux;arith.ratio;em.X-ray double nullable hardness_ratio_2_error RMS Uncertainty on Hardness Ratio 2 stat.error;phot.flux;arith.ratio;em.X-ray double nullable maximum_likelihood Maximum Likelihood stat.likelihood;em.X-ray double nullable hardness_ratio_1 Hardness Ratio 1 (HR1=(M-S)/(M+S)) phot.flux;arith.ratio;em.X-ray double nullable lii Galactic Longitude degree pos.galactic.lon double nullable alt_name Alternative Source Designation (C69-X-eNNN or C69-X-wNNN) meta.id char nullable off_axis Off-Axis Angle (arcmin) arcmin instr.offset double nullable instrument Instrument Used for the Spectral Analysis instr;instr.det char nullable bii Galactic Latitude degree pos.galactic.lat double nullable hardness_ratio_1_error RMS Uncertainty on Hardness Ratio 1 stat.error;phot.flux;arith.ratio;em.X-ray double 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