Chandra Deep Field South 2-Megasecond Catalog

Chandra Deep Field South 2-Megasecond Catalog CHANDFS2MS ivo://nasa.heasarc/chandfs2ms NASA/GSFC HEASARC Luo et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains point-source catalogs for the ~2 Ms exposure of the Chandra Deep Field-South (CDF-S) this is one of the two most sensitive X-ray surveys ever performed. The survey covers an area of ~436 arcmin2 and reaches on-axis sensitivity limits of ~1.9 x 10-17 and ~1.3 x 10-16 erg cm-2 s-1 for the 0.5-2.0 and 2-8 keV bands, respectively. Four hundred and sixty-two X-ray point sources (source_sample = 'Main CDF-S' in this table) are detected in at least one of three X-ray bands that were searched; 135 of these sources are new compared to the previous ~1 Ms CDF-S detections. Source positions are determined using centroid and matched-filter techniques; the median positional uncertainty is ~0.36". The X-ray-to-optical flux ratios of the newly detected sources indicate a variety of source types; ~55% of them appear to be active galactic nuclei, while ~45% appear to be starburst and normal galaxies. This table contains, in addition to the main Chandra catalog, the supplementary catalog of 86 X-ray sources (source_sample = 'CDF-S + E-CDF-S' in this table) in the ~2 Ms CDF-S footprint that was created by merging the ~250 ks Extended Chandra Deep Field-South with the CDF-S; this approach provides additional sensitivity in the outer portions of the CDF-S. This table also contains a second supplementary catalog (source_sample = 'Optically Bright' in this table) of 30 X-ray sources which was constructed by matching lower significance X-ray sources to bright optical counterparts (R < 23.8); the majority of these sources appear to be starburst and normal galaxies. The total number of sources in this table, which contains the main and 2 supplementary catalogs, is thus 578. Optical R-band counterparts and basic optical and infrared photometry are provided for the X-ray sources in the main and supplementary catalogs. The authors also include existing spectroscopic redshifts for 224 of the X-ray sources. The average backgrounds in the 0.5-2.0 and 2-8 keV bands are 0.066 and 0.167 counts Ms-1 pixel-1, respectively, and the background counts follow Poisson distributions. The effective exposure times and sensitivity limits of the CDF-S are now comparable to those of the ~2 Ms Chandra Deep Field-North (CDF-N). In their paper, the authors also present cumulative number counts for the main catalog and compare the results to those for the CDF-N. The soft-band number counts for these two fields agree well with each other at fluxes higher than ~2 x 10-16 erg cm-2 s-1, while the CDF-S number counts are up to ~25% smaller than those for the CDF-N at fluxes below ~2 x 10-16 erg cm-2 s-1 in the soft band and ~2 x 10-15 erg cm-2 s-1 in the hard band, suggesting small field-to-field variations. This table was created by the HEASARC in December 2008 based on the electronic version of Tables 2, 5 and 6 from the reference paper which were obtained from the ApJ web site. It was last modified by the HEASARC in July 2011. This is a service provided by NASA HEASARC . 2008ApJS..179...19L https://heasarc.gsfc.nasa.gov/W3Browse/all/chandfs2ms.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=chandfs2ms& GET text/xml 180 99999 true 53.12570833 -28.00677778 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=chandfs2ms GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_chandfs2ms&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public chandfs2ms Chandra Deep Field South 2-Megasecond Catalog name Position-Based IAU 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 Positional Uncertainty (arcsec) arcsec stat.error;pos double nullable off_axis Off-Axis Angle (arcmin) arcmin instr.offset double nullable fb_counts Full-Band Counts ct phot;em.X-ray double nullable fb_counts_pos_err Full-Band Counts Upper Error ct stat.error;phot;em.X-ray double nullable fb_counts_neg_err Full-Band Counts Lower Error ct stat.error;phot;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 flux_5p8_um The 5.8 Micro Flux Density (IRAC) microJy phot.mag;em.IR.4-8um double nullable hb_counts_pos_err Hard-Band Counts Upper Error ct stat.error;phot;em.X-ray.medium double nullable band_ratio_pos_err Band Ratio Upper Error stat.error;phot.count;arith.ratio;em.X-ray double nullable spectral_index_pos_err Photon Index Upper Error stat.error;spect.index;em.X-ray double nullable lii Galactic Longitude degree pos.galactic.lon double nullable hb_flux Hard-Band Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray.medium double nullable sb_counts Soft-Band Counts ct phot;em.X-ray.soft double nullable hb_counts_neg_err Hard-Band Counts Lower Error ct stat.error;phot;em.X-ray.medium double nullable fb_exposure Full-Band Effective Exposure Time (s) s time.duration;obs.exposure double nullable a03_source_number A03 CDFS Source Identification meta.id.assoc short nullable fb_flux Full-Band Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray double nullable bii Galactic Latitude degree pos.galactic.lat double nullable band_ratio Band Ratio (HB/SB) phot.count;arith.ratio;em.X-ray double nullable g02_dec G02 CDFS Declination degree double nullable redshift Spectroscopic Redshift src.redshift double nullable sb_counts_pos_err Soft-Band Counts Upper Error ct stat.error;phot;em.X-ray.soft double nullable a03_dec A03 CDFS Declination degree double nullable g02_ra G02 CDFS Right Ascension degree double nullable sb_counts_neg_err Soft-Band Counts Lower Error ct stat.error;phot;em.X-ray.soft double nullable goodss_source_number GOODS-S CDFS Source Identification meta.id.assoc int nullable log_min_fp_prob Logarithm of the Minimum False-Positive Probability stat.probability short nullable optical_dec Optical Declination degree double nullable sb_flux Soft-Band Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray.soft double nullable hb_counts Hard-Band Counts ct phot;em.X-ray.medium double nullable source_sample Indicates Published Table/Sample from Which Entry Originates meta.ref;meta.table char nullable ref_redshift Reference for the Redshift meta.ref;src.redshift short nullable gems_name GEMS CDFS Source Identification meta.id.assoc char nullable zmag The z Band Magnitude (GEMS) mag phot.mag;em.opt double nullable spectral_index Photon Index spect.index;em.X-ray double nullable imag The i Band Magnitude (GOODS-S) mag phot.mag;em.opt.I double nullable hb_exposure Hard-Band Effective Exposure Time (s) s time.duration;obs.exposure double nullable source_identifier Catalog Source Identifier meta.id char nullable ks_mag The K_s Band Magnitude (SOFI) mag phot.mag;em.IR.K double nullable g02_source_number G02 CDFS Source Identification meta.id.assoc short nullable l05_dec L05 ECDFS Declination degree double nullable off_set Offset Between Optical and X-Ray Positions (arcsec) arcsec pos.angDistance;em.X-ray;em.opt double nullable l05_source_number L05 ECDFS Source Identification meta.id.assoc short nullable rmag The R Band Magnitude (WFI) mag phot.mag;em.opt.R double nullable irac_source_number IRAC CDFS Source Identification meta.id.assoc int nullable spectral_index_neg_err Photon Index Lower Error stat.error;spect.index;em.X-ray double nullable alt_name Alternative Catalog Source Designation meta.id char nullable note_flags Additional Notes meta.code char nullable sofi_source_number SOFI CDFS Source Identification meta.id.assoc short nullable band_ratio_neg_err Band Ratio Lower Error stat.error;phot.count;arith.ratio;em.X-ray double nullable sb_exposure Soft-Band Effective Exposure Time (s) s time.duration;obs.exposure double nullable a03_ra A03 CDFS Right Ascension degree double nullable optical_ra Optical Right Ascension degree double nullable l05_ra L05 ECDFS Right Ascension degree double nullable xid_source_number G02 CDFS Source Unique Detection Identification meta.id.assoc short nullable