XBOOTES: NDWFS Bootes Field X-Ray Point Source Catalog

XBOOTES: NDWFS Bootes Field X-Ray Point Source Catalog XBootes ivo://nasa.heasarc/xbootes NASA/GSFC HEASARC Kenter et al. 2026-07-17 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The XBootes table contains the X-Ray point source catalog from a Chandra survey of the 9 square degrees Bootes field of the NOAO Deep Wide-Field Survey (NDWFS). This XBootes survey consists of 126 separate contiguous ACIS-I observations each of approximately 5000 s in duration. These unique Chandra observations allowed the authors to search for large-scale structure and to calculate X-ray source statistics over a wide, contiguous field of view with arcsecond angular resolution and uniform coverage. Optical spectroscopic follow-up observations and the rich NDWFS data set will allow the authors to identify and classify these X-ray-selected sources. Using wavelet decomposition, they have detected 4642 point sources with n >= 2 counts. In order to keep their detections ~ 99% reliable, they have limited their list to sources with n >= 4 counts. For a 5000 s observation and assuming a canonical unabsorbed active galactic nucleus (AGN) type X-ray spectrum, a 4 count on-axis source corresponds to a flux of 4.7 x 10-15 ergs cm-2 s-1 in the soft (0.5-2 keV) band, 1.5 x 10-14 ergs cm-2 s-1 in the hard (2-7 keV) band, and 7.8 x 10-15 ergs cm-2 s-1 in the full (0.5-7 keV) band. The full 0.5-7 keV band n >= 4 count list contained in this HEASARC table has 3293 point sources. In addition to the point sources, 43 extended sources (not included in this HEASARC table) have been detected, consistent with the depth of these observations and the number counts of clusters. Presented here in the X-ray point source catalog for the XBootes survey are the source positions, X-ray fluxes, hardness ratios, and their uncertainties, for the 3293 sources with >= 4 counts in the full band. This table was created by the HEASARC in February 2006 based on the machine-readable version of Table 3 in the above paper which was obtained from the electronic ApJ website. This is a service provided by NASA HEASARC . 2005ApJS..161....9K https://heasarc.gsfc.nasa.gov/W3Browse/all/xbootes.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=xbootes& GET text/xml 180 99999 true 218.094 32.300725 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=xbootes GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_xbootes&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public xbootes XBOOTES: NDWFS Bootes Field 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 Uncertainty in the Position arcsec stat.error;pos float nullable fb_counts The 0.5-7 keV Counts ct phot;em.X-ray.medium short nullable fb_flux The 0.5-7 keV Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray.medium double nullable fb_flux_error Uncertainty in the 0.5-7 keV Flux erg/s/cm^2 stat.error;phot.flux;em.X-ray.medium double nullable exposure Exposure Time (s) s time.duration;obs.exposure double nullable hb_flux_error Uncertainty in the 2-7 keV Flux erg/s/cm^2 stat.error;phot.flux;em.X-ray.medium double nullable hb_counts The 2-7 keV Counts ct phot;em.X-ray.medium short nullable hb_flux The 2-7 keV Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray.medium double nullable eff_area_fraction Effective Area Fraction double nullable sb_flux The 0.5-2 keV Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray.soft double nullable bii Galactic Latitude degree pos.galactic.lat double nullable sb_flux_limit Limit Flag for the 0.5-2 keV Flux meta.code;phot.flux;em.X-ray.soft char nullable hardness_ratio Hardness Ratio phot.flux;arith.ratio;em.X-ray.medium;em.X-ray.soft double nullable sb_flux_error Uncertainty in the 0.5-2 keV Flux erg/s/cm^2 stat.error;phot.flux;em.X-ray.soft double nullable lii Galactic Longitude degree pos.galactic.lon double nullable hardness_ratio_neg_err Lower Limit of Hardness Ratio stat.error;phot.flux;arith.ratio;em.X-ray.medium;em.X-ray.soft double nullable hb_flux_limit Limit Flag for the 2-7 keV Flux meta.code;phot.flux;em.X-ray.medium char nullable hardness_ratio_pos_err Upper Limit of Hardness Ratio stat.error;phot.flux;arith.ratio;em.X-ray.medium;em.X-ray.soft double nullable sb_counts The 0.5-2 keV Counts ct phot;em.X-ray.soft short 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