Omega Centauri XMM-Newton X-Ray Point Source Catalog

Omega Centauri XMM-Newton X-Ray Point Source Catalog OMEGCENXMM ivo://nasa.heasarc/omegcenxmm NASA/GSFC HEASARC Gendre et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source Omega Centauri (NGC 5139) is one of the best studied objects in our galaxy. It is the most massive globular cluster (5.1 x 106 solar masses), and is characterized by large core and half mass radii (154.88 and 250.8 arcseconds, respectively (Harris 1996, AJ, 112, 1487). The authors observed Omega Cen with XMM-Newton on August 13th, 2001. The observation lasted 37 ks and was performed with the medium filter. The authors detected 11 and 27 faint X-ray sources in the core and half mass radii, respectively, searching down to a luminosity of 1.3 x 1031 ergs s-1 in the 0.5 - 5 keV range (for an assumed distance to Omega Cen of 5.3 kpc). Most sources have bolometric X-ray luminosities between ~ 1031 - 1032 ergs s-1. The bulk of sources are hard and spectrally similar to CVs. The lack of soft faint sources might be related to the absence of millisecond pulsars in the cluster. The XMM-Newton observations reveal the presence of an excess of sources well outside the core of the cluster where several RS CVn binaries have already been found. The authors also analyzed a publicly available Chandra ACIS-I observation performed on January 24 - 25th, 2000, to improve the XMM-Newton source positions and to search for source intensity variations between the two data sets. 63 XMM-Newton sources have a Chandra counterpart, and 15 sources within the half-mass radius have shown time variability. Overall, the general properties of the faint X-ray sources in omega Cen suggest that they are predominantly CVs and active binaries (RS CVn or BY Dra). This table lists all 146 X-ray sources detected in the XMM-Newton observation above a maximum likelihood threshold in the 0.5 - 5 keV band of 12, including the 27 sources within the half-mass radius (listed in Table 1 of the reference paper), and the 119 sources outside the half-mass radius (listed in Table 2 of the reference paper). About 9 of the 27 sources within the half-mass radius are expected to be background sources, as are ~ 65 of the sources within 12.5 arcminutes of the cluster center, i.e., a significant fraction of the 146 total observed X-ray sources. For each XMM-Newton source, its position, count rate, correlation with previous X-ray observation, and their associated errors are given. The detailed spectral information given in Table 5 of the reference paper for 17 selected X-ray sources is however not included in this HEASARC table. This table was created by the HEASARC in May 2007 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/400/521">CDS catalog J/A+A/400/521</a> files table1.dat, table2.dat and table3.dat. This is a service provided by NASA HEASARC . 2003A&A...400..521G https://heasarc.gsfc.nasa.gov/W3Browse/all/omegcenxmm.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=omegcenxmm& GET text/xml 180 99999 true 201.76375 -47.71163889 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=omegcenxmm GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_omegcenxmm&Action=More+Options&Action=Parameter+Search&ConeAdd=1 XMM-NEWTON 0.0166666666666667 X-ray public omegcenxmm Omega Centauri 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 Statistical Position Error arcsec stat.error;pos double nullable count_rate Count Rate ct/s phot.count;em.X-ray double nullable count_rate_error Count Rate Error ct/s stat.error;phot.count;em.X-ray double nullable core_flag Flag Indicates Core Source meta.code char nullable hmr_flag Flag Indicates Source Detected within the Half Mass Radius meta.code char nullable einstein_id Einstein Source Identification ([HG83b] NGC 5139 A) meta.id.cross char nullable lii Galactic Longitude degree pos.galactic.lon double nullable chandra_ra_j2000_error Statistical Position Error in Chandra J2000 Right Ascension arcsec stat.error;pos.eq.ra double nullable rosat_id ROSAT Source Identification ([JVH94] NGC 5139 NNa) meta.id.cross char nullable mos1_detection Flag Indicates MOS1 Detection meta.code char nullable chandra_dec_j2000 Chandra J2000 Declination pos.eq.dec char nullable mos2_detection Flag Indicates MOS2 Detection meta.code char nullable source_number Sequential Identification Number for Each X-Ray Source in Catalog meta.id short nullable chandra_ra_j2000 Chandra J2000 Right Ascension pos.eq.ra char nullable detection_instrument EPIC-PN Instrument Used for Detection meta.id;instr char nullable chandra_dec_j2000_error Statistical Position Error in Chandra J2000 Declination arcsec stat.error;pos.eq.dec double nullable bii Galactic Latitude degree pos.galactic.lat 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