Extended Chandra Deep Field-South X-Ray Point Source Catalog ECDFSCXO ivo://nasa.heasarc/ecdfscxo NASA/GSFC HEASARC Virani et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The Extended Chandra Deep Field-South (ECDFS) survey consists of four Chandra X-Ray Observatory (CXO) ACIS-I pointings and covers ~1100 arcmin&lt;sup&gt;2&lt;/sup&gt; (~0.3 deg&lt;sup&gt;2&lt;/sup&gt;) centered on the original CDF-S field to a depth of approximately 228 ks. This is the largest Chandra survey ever conducted at such depth, and only one XMM-Newton survey reaches a lower flux limit in the hard 2.0-8.0 keV band. The authors detect 651 unique sources: 587 using a conservative source-detection threshold (identified by source_type = &#39;P&#39; for primary source) and 64 (identified by source_type = &#39;S&#39; for secondary source) using a lower source-detection threshold. These are combined in this HEASARC representation but were presented as two separate catalogs (Table 4 contained the primary sources, and Table 5 the secondary sources) in the original reference paper. Of the 651 total sources, 561 are detected in the full 0.5-8.0 keV band, 529 in the soft 0.5-2.0 keV band, and 335 in the hard 2.0-8.0 keV band. For point sources near the aim point, the limiting fluxes are approximately 1.7 x 10&lt;sup&gt;-16&lt;/sup&gt; and 3.9 x 10&lt;sup&gt;-16&lt;/sup&gt; ergs/cm&lt;sup&gt;2&lt;/sup&gt;/s in the 0.5-2.0 and 2.0-8.0 keV bands, respectively. In their paper, the authors present the differential and cumulative flux distributions, which are in good agreement with the number counts from previous deep X-ray surveys and with the predictions from an active galactic nucleus (AGN) population synthesis model that can explain the X-ray background. In general, fainter sources have harder X-ray spectra, consistent with the hypothesis that these sources are mainly obscured AGNs. All nine observations of the ECDFS survey field were conducted with the Advanced CCD Imaging Spectrometer (ACIS) on board Chandra as part of the approved guest observer program in Cycle 5. Notice that Lehmer et al. (2005, ApJS, 161, 21) conducted a somewhat different analysis on these same data and obtained similar, but not identical results, e.g., Lehmer et al. found 809 total X-ray sources compared to 651 in the present table. This table was created by the HEASARC in April 2009 based on the electronic versions of Tables 4 and 5 from the paper which were obtained from the CDS (their catalog J/AJ/131/2373 files table4.dat and table5.dat). This is a service provided by NASA HEASARC . 2006AJ....131.2373V https://heasarc.gsfc.nasa.gov/W3Browse/all/ecdfscxo.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=ecdfscxo& GET text/xml 180 99999 true 53.12895833 -28.10408333 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=ecdfscxo GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_ecdfscxo&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public ecdfscxo Extended Chandra Deep Field-South 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 fb_count_rate Full (0.5-8keV) Count Rate ct/s phot.count;em.X-ray double nullable fb_count_rate_low_bound Full (0.5-8keV) Count Rate Lower Bound ct/s phot.count;stat.min;em.X-ray double nullable fb_count_rate_high_bound Full (0.5-8keV) Count Rate Upper Bound ct/s phot.count;stat.max;em.X-ray double nullable fb_flux Full (0.5-8keV) Flux erg/s/cm^2 phot.flux;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 hb_flux Hard (2-8keV) Flux erg/s/cm^2 phot.flux;em.X-ray.medium double nullable hb_count_rate_low_bound Hard (2-8keV) Count Rate Lower Bound ct/s phot.count;stat.min;em.X-ray.medium double nullable lii Galactic Longitude degree pos.galactic.lon double nullable alt_name Alternative IAU-Style Source Designation (CXOYECDF JHHMMSS.s+DDMMSS) meta.id char nullable hb_count_rate_high_bound Hard (2-8keV) Count Rate Upper Bound ct/s phot.count;stat.max;em.X-ray.medium double nullable sb_count_rate_low_bound Soft (0.5-2keV) Count Rate Lower Bound ct/s phot.count;em.X-ray.soft double nullable hb_count_rate Hard (2-8keV) Count Rate ct/s phot.count;em.X-ray.medium double nullable source_type Flag [PS] Indicates P=Primary, False Positive <= 1e-7; S=Secondary, FP <= 1e-6 src.class char nullable sb_flux Soft (0.5-2keV) Flux erg/s/cm^2 phot.flux;em.X-ray.soft double nullable source_notes Notes Concerning Source meta.note;src char nullable sb_count_rate Soft (0.5-2keV) Count Rate ct/s phot.count;em.X-ray.soft double nullable source_number Sequential Identification Number for Each Source in Catalog meta.id;src short nullable psf_size PSF Size (arcsec) arcsec instr.det.psf double nullable bii Galactic Latitude degree pos.galactic.lat double nullable sb_count_rate_high_bound Soft (0.5-2keV) Count Rate Upper Bound ct/s phot.count;em.X-ray.soft double nullable