Chandra Multiwavelength Project (ChaMP) Point Source Catalog ChaMPPS ivo://nasa.heasarc/champpsc NASA/GSFC HEASARC Kim et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table represents the `Main Chandra Multiwavelength Project (ChaMP) X-Ray Point Source Catalog' and contains the basic parameters, photometry, and fluxes of 6512 ChaMP sources in 130 Chandra observations from Chandra Cycles 1 and 2. This table lists fluxes for 2 assumed spectral energy distributions with the photon indices of Gamma=1.4 and Gamma=1.7. This catalog was distributed by the ChaMP team based on the "Chandra Multiwavelength Project: X-ray Point Source Catalog (Kim et al., 2007, ApJS, 169, 401)", and was downloaded from <a href="http://hea-www.harvard.edu/CHAMP/">http://hea-www.harvard.edu/CHAMP/</a>. If you have any comments/questions on this catalog, please contact mkim @ cfa.harvard.edu or dkim @ cfa.harvard.edu. The full Chandra Multiwavelength Project (ChaMP) X-ray point source catalog lists ~ 6800 X-ray sources detected in 149 Chandra observations covering ~ 10 square degrees. The full ChaMP catalog sample is 7 times larger than the initial published ChaMP catalog (Kim et al. 2004, ApJS, 150, 19). The exposure times of the fields in this sample range from 0.9 to 124 ks, corresponding to a deepest X-ray flux limit in the 0.5 - 8.0 keV band of 9 x 10<sup>-16</sup> ergs cm<sup>-2</sup> s<sup>-1</sup>. The ChaMP X-ray data were uniformly reduced and analyzed with ChaMP-specific pipelines and then carefully validated by visual inspection. The ChaMP catalog includes X-ray photometric data in eight different energy bands as well as X-ray spectral hardness ratios and colors, source reliability, detection probability, and positional uncertainties. The false source detection rate is ~1% of all detected ChaMP sources, while the detection probability is better than ~ 95% for sources with counts >~ 30 and off-axis angle <5'. The typical positional offset between ChaMP X-ray source and their SDSS optical counterparts is 0.7" +/- 0.4", derived from ~ 900 matched sources. This HEASARC table contains the main ChaMP catalog of 6512 X-ray point sources in 130 ChaMP fields observed once and in the overlapping fields which had the longest exposures. It does not contain the supplementary ChaMP catalog of 853 sources in 19 ChaMP overlapping fields with shorter exposure times. This table was created by the HEASARC in October 2006 based on the table <a href="http://hea-www.cfa.harvard.edu/CHAMP/IMAGES_DATA/champ_xpc.tab">http://hea-www.cfa.harvard.edu/CHAMP/IMAGES_DATA/champ_xpc.tab</a> on the ChaMP website. This is a service provided by NASA HEASARC . 2007ApJS..169..401K https://heasarc.gsfc.nasa.gov/W3Browse/all/champpsc.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=champpsc& GET text/xml 180 99999 true 302.442017 -48.94356 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=champpsc GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_champpsc&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public champpsc Chandra Multiwavelength Project (ChaMP) 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 counts Net Total Counts (0.5-8 keV) ct double nullable counts_error Error in Net Total Counts (0.5-8 keV) ct stat.error;phot double nullable flux Total-Band Source Flux (0.5-8 keV, gamma=1.4) erg/cm^2/s phot.flux;em.X-ray.medium double nullable flux_error Error in Total-Band Flux (0.5-8 keV, gamma=1.4) erg/cm^2/s stat.error;phot.flux double nullable hb_counts Net Hard-Band Counts (2-8 keV) ct phot;em.X-ray.medium double nullable hb_flux_1p7_error Error in Hard-Band Source Flux (2-8 keV, gamma=1.7) erg/cm^2/s stat.error;phot.flux;em.X-ray.medium double nullable c32_color X-Ray Color C32 phot.color;em.X-ray double nullable sb_flux_1p7_error Error in Soft-Band Flux error (0.5-2 keV, gamma=1.7) erg/cm^2/s stat.error;phot.flux;em.X-ray.soft double nullable c21_color X-Ray Color C21 phot.color;em.X-ray.medium double nullable hardness_ratio_min 68% Confidence Lower Limit of Hardness Ratio double nullable off_axis Off-Axis Angle from the Aimed Pointing of the Observation (arcmin) arcmin instr.offset double nullable hb_flux Hard-Band Source Flux (2-8 keV, gamma=1.4) erg/cm^2/s phot.flux;em.X-ray.medium double nullable c32_color_max 68% Confidence Upper Limit of C32 phot.color;em.X-ray.medium;stat double nullable c21_color_max 68% Confidence Upper Limit of C21 (c) phot.color;em.X-ray.medium;stat double nullable error_radius Positional Uncertainty (95% Confidence Level) (arcsec) arcsec stat.error;pos float nullable sb_counts_error Error in Net Soft-Band Counts (0.5-2 keV) ct stat.error;phot;em.X-ray.soft double nullable hardness_ratio Hardness Ratio phot.count;arith.ratio double nullable source_flag Flags Indicate Notes Concerning Detection meta.code.qual char nullable sb_counts Net Soft-Band Counts (0.5-2 keV) ct phot;em.X-ray.soft double nullable c21_color_min 68% Confidence Lower Limit of C21 (c) phot.color;em.X-ray.medium;stat double nullable hb_counts_error Error in Net Hard-Band Counts (2-8 keV) ct stat.error;phot;em.X-ray.medium double nullable hb_flux_error Error in Hard-Band Flux (2-8 keV, gamma=1.4) erg/cm^2/s stat.error;phot.flux;em.X-ray.medium double nullable flux_1p7 Total-Band Source Flux (0.5-8 keV, gamma=1.7) erg/cm^2/s phot.flux;em.X-ray.medium double nullable hardness_ratio_max 68% Confidence Upper Limit of Hardness Ratio double nullable exposure Mean Effective Exposure Time After Vignetting Correction (s) s time.duration;obs.exposure double nullable c32_color_min 68% Confidence Lower Limit of C32 phot.color;em.X-ray.medium;stat double nullable hb_flux_1p7 Hard-Band Source Flux (2-8 keV, gamma=1.7) erg/cm^2/s phot.flux;em.X-ray.medium double nullable lii Galactic Longitude degree pos.galactic.lon double nullable sb_flux_error Error in Soft-Band Flux (0.5-2 keV, gamma=1.4) erg/cm^2/s stat.error;phot.flux;em.X-ray.soft double nullable flux_1p7_error Error in Total-Band Flux (0.5-8 keV, gamma=1.7) erg/cm^2/s stat.error;phot.flux;em.X-ray.medium double nullable extraction_radius Source Extraction Radius (95% Encircled Energy Radius at 1.5 keV) (arcsec) arcsec double nullable bii Galactic Latitude degree pos.galactic.lat double nullable sb_flux_1p7 Soft-Band Source Flux (0.5-2 keV, gamma=1.7) erg/cm^2/s phot.flux;em.X-ray.soft double nullable sb_flux Soft-Band Source Flux (0.5-2 keV, gamma=1.4) erg/cm^2/s phot.flux;em.X-ray.soft 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