Chandra Deep Field South 4-Megasecond Catalog

Chandra Deep Field South 4-Megasecond Catalog CHANDFS4MS ivo://nasa.heasarc/chandfs4ms NASA/GSFC HEASARC Xue et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains the main Chandra source catalog for the 4 megasecond (Ms) Chandra Deep Field-South (CDF-S), which is the deepest Chandra survey to date and covers an area of 464.5 arcmin2. It contains 740 X-ray sources that are detected with wavdetect at a false-positive probability threshold of 10-5 in at least one of three X-ray bands (0.5-8 keV, full band; 0.5-2 keV, soft band; and 2-8 keV, hard band) and also satisfy a binomial-probability source-selection criterion of P < 0.004 (i.e., the probability of sources not being real is less than 0.004); this approach is designed to maximize the number of reliable sources detected. A total of 300 main-catalog sources are new compared to the previous 2 Ms CDF-S main-catalog (the HEASARC CHANDFS2MS table) sources. The authors determined X-ray source positions using centroid and matched-filter techniques and obtained a median positional uncertainty of ~0.42 arcseconds. In their paper, they also provided a supplementary catalog (not included in this HEASARC table), which consists of 36 sources that are detected with wavdetect at a false-positive probability threshold of 10-5, satisfy the condition of 0.004 < P < 0.1, and have an optical counterpart with R < 24. Multiwavelength identifications, basic optical/infrared/radio photometry, and spectroscopic/photometric redshifts are provided for the X-ray sources in the main and supplementary catalogs. Seven hundred sixteen (~97%) of the 740 main-catalog sources have multiwavelength counterparts, with 673 (~94% of 716) having either spectroscopic or photometric redshifts. The 740 main-catalog sources span broad ranges of full-band flux and 0.5-8 keV luminosity; the 300 new main-catalog sources span similar ranges although they tend to be systematically lower. Basic analyses of the X-ray and multiwavelength properties of the sources indicate that >75% of the main-catalog sources are active galactic nuclei (AGNs); of the 300 new main-catalog sources, about 35% are likely normal and starburst galaxies, reflecting the rise of normal and starburst galaxies at the very faint flux levels uniquely accessible to the 4 Ms CDF-S. Near the center of the 4 Ms CDF-S (i.e., within an off-axis angle of 3'), the observed AGN and galaxy source densities have reached 9800 (+1300,-1100) deg-2 and 6900 (+1100,-900) deg-2, respectively. Simulations show that the main catalog is highly reliable and is reasonably complete. The mean backgrounds (corrected for vignetting and exposure-time variations) are 0.063 and 0.178 counts Ms-1 pixel-1 (for a pixel size of 0.492 arcseconds) for the soft and hard bands, respectively; the majority of the pixels have zero background counts. The 4 Ms CDF-S reaches on-axis flux limits of ~3.2 x 10-17, 9.1 x 10-18, and 5.5 x 10-17 erg cm-2 s-1 for the full, soft, and hard bands, respectively. An increase in the CDF-S exposure time by a factor of ~2-2.5 would provide further significant gains and probe key unexplored discovery space. This HEASARC table comprises Table 3 from the reference paper, the Main Chandra Source Catalog of 740 X-ray sources. The 36 optically bright Chandra sources that were listed in Table 6 of the reference paper are thus not included herein. This table was created by the HEASARC in July 2011 based on an electronic version of Table 3 from the reference paper which was obtained from the ApJS web site. This is a service provided by NASA HEASARC . 2011ApJS..195...10X https://heasarc.gsfc.nasa.gov/W3Browse/all/chandfs4ms.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=chandfs4ms& GET text/xml 180 99999 true 53.12575 -28.00566667 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=chandfs4ms GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_chandfs4ms&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public chandfs4ms Chandra Deep Field South 4-Megasecond 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 Positional Error (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 Upper Uncertainty for Full-Band Counts ct stat.error;phot;em.X-ray double nullable fb_counts_neg_err Lower Uncertainty for Full-Band Counts ct stat.error;phot;em.X-ray double nullable redshift Preferred Redshift Adopted in This Paper src.redshift double nullable fb_flux Full-Band Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray double nullable musyc_dec MUSYC K-Band Declination degree pos.eq.dec;em.IR.K double nullable l05_ra L05 ECDFS Right Ascension degree pos.eq.ra;em.X-ray double nullable phot_redshift_4 Rafferty et al. 2011 Photometric Redshift src.redshift double nullable musyc_ra MUSYC K-Band Right Ascension degree pos.eq.ra;em.IR.K double nullable phot_redshift_1_max Upper Limit on Luo et al. 2010 Photometric Redshift src.redshift;stat.max double nullable goodss_zmag AB Magnitude of GOODS-S z-Band CP mag phot.mag;em.opt double nullable extent_flag Flag [012] Indicates Whether a Source Shows Any Evidence for Spatial Extent meta.code;phys.angSize short nullable band_ratio Band Ratio (HB/SB) phot.count;arith.ratio;em.X-ray double nullable phot_redshift_3_max Upper Limit on Cardamone et al. 2010 Photometric Redshift src.redshift;stat.max double nullable hb_flux Hard-Band Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray.medium double nullable l08_source_number L08 CDFS Source Identification Number meta.id.cross char nullable band_ratio_pos_err Upper Uncertainty for Band Ratio stat.error;phot.count;arith.ratio;em.X-ray double nullable bii Galactic Latitude degree pos.galactic.lat double nullable sb_counts_neg_err Lower Uncertainty for Soft-Band Counts ct stat.error;phot;em.X-ray.soft double nullable hb_counts_pos_err Upper Uncertainty for Hard-Band Counts ct stat.error;phot;em.X-ray.medium double nullable lii Galactic Longitude degree pos.galactic.lon double nullable wfi_ra WFI R-Band Right Ascension degree pos.eq.ra;em.opt.R double nullable music_kmag AB Magnitude of MUSIC K-Band CP mag phot.mag;em.IR.K double nullable phot_redshift_3_flag Quality Flag on Cardamone et al. 2010 Photometric Redshift meta.code;src.redshift double nullable rf_lx Absorption-Corrected, Rest-Frame 0.5-8 keV Luminosity (erg/s) erg/s phys.luminosity;em.X-ray double nullable l08_ra L08 CDFS Right Ascension degree pos.eq.ra;em.X-ray double nullable sb_flux Soft-Band Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray.soft double nullable wfi_dec WFI R-Band Declination degree pos.eq.dec;em.opt.R double nullable band_ratio_neg_err Lower Uncertainty for Band Ratio stat.error;phot.count;arith.ratio;em.X-ray double nullable musyc_kmag AB Magnitude of MUSYC K-Band CP mag phot.mag;em.IR.K double nullable phot_redshift_1_min Lower Limit on Luo et al. 2010 Photometric Redshift src.redshift;stat.min double nullable phot_redshift_3 Cardamone et al. 2010 Photometric Redshift src.redshift double nullable goodss_dec GOODS-S z-Band Declination degree pos.eq.dec;em.opt double nullable crtpart_ab_mag AB Magnitude of Optical/NIR/Radio CP mag meta.id.cross double nullable hb_exposure Hard-Band Effective Exposure Time s time.duration;obs.exposure double nullable broad_type Source Type src.class char nullable photon_index_min Lower Bound (Minimum) for Photon Index spect.index;stat.min;em.X-ray double nullable rmag AB Magnitude of WFI R-Band CP mag phot.mag;em.opt.R double nullable simple_ra SIMPLE 3.6-micron Right Ascension degree pos.eq.ra;em.IR.3-4um double nullable hb_counts_neg_err Lower Uncertainty for Hard-Band Counts ct stat.error;phot;em.X-ray.medium double nullable gems_zmag AB Magnitude of GEMS z-Band CP mag phot.mag;em.opt double nullable vla_ra VLA 1.4-GHz Right Ascension degree pos.eq.ra;em.radio.750-1500MHz double nullable l05_dec L05 ECDFS Declination degree pos.eq.dec;em.X-ray double nullable gems_dec GEMS z-Band Declination degree pos.eq.dec;em.opt double nullable xid_source_number Source Identification Number meta.id;src short nullable ctrpart_catalog Catalog Designation of Optical/NIR/Radio CP meta.ref;meta.table char nullable sb_counts_pos_err Upper Uncertainty for Soft-Band Counts ct stat.error;phot;em.X-ray.soft double nullable onir_ra Optical/NIR/Radio CP Right Ascension degree pos.eq.ra double nullable phot_redshift_2 Alternative Luo et al. 2010 Photometric Redshift src.redshift double nullable onir_dec Optical/NIR/radio CP Declination degree pos.eq.dec double nullable phot_redshift_3_min Lower Limit on Cardamone et al. 2010 Photometric Redshift src.redshift;stat.min double nullable simple_dec SIMPLE 3.6-micron Declination degree pos.eq.dec;em.IR.3-4um double nullable phot_redshift_1 Luo et al. 2010 Photometric Redshift src.redshift double nullable notes Additional Notes meta.note char nullable ref_spect_redshift Reference for Spectroscopic Redshift meta.ref;src.redshift short nullable goodss_ra GOODS-S z-Band Right Ascension degree pos.eq.ra;em.opt double nullable vla_20_cm_mag AB Magnitude of VLA 1.4-GHz CP mag phot.mag;em.radio.750-1500MHz double nullable fb_exposure Full-Band Effective Exposure Time s time.duration;obs.exposure double nullable log_min_ns_prob Logarithm of Binomial No-Source Probability stat.probability double nullable music_dec MUSIC K-Band Declination degree pos.eq.dec;em.IR.K double nullable spect_redshift_flag Quality Flag on Spectroscopic Redshift meta.code;src.redshift char nullable vla_dec VLA 1.4-GHz Declination degree pos.eq.dec;em.radio.750-1500MHz double nullable l05_source_number L05 ECDFS Source Identification Number meta.id.cross char nullable hb_counts Hard-Band Counts ct phot;em.X-ray.medium double nullable music_ra MUSIC K-Band Right Ascension degree pos.eq.ra;em.IR.K double nullable photon_index Photon Index spect.index;em.X-ray double nullable class Browse Object Classification src.class short nullable alt_name Alternative Catalog-Based Source Designation meta.id char nullable phot_redshift_4_max Upper Limit on Rafferty et al. 2011 Photometric Redshift src.redshift;stat.max double nullable simple_3p6_um_mag AB Magnitude of SIMPLE 3.6-micron CP mag phot.mag;em.IR.3-4um double nullable spect_redshift Spectroscopic Redshift src.redshift double nullable log_min_fp_prob Logarithm of Minimum False-Positive Probability stat.probability short nullable phot_redshift_4_min Lower Limit on Rafferty et al. 2011 Photometric Redshift src.redshift;stat.min double nullable sb_exposure Soft-Band Effective Exposure Time s time.duration;obs.exposure double nullable photon_index_max Upper Bound (Maximum) for Photon Index spect.index;stat.max;em.X-ray double nullable gems_ra GEMS z-Band Right Ascension degree pos.eq.ra;em.opt double nullable l08_dec L08 CDFS Declination degree pos.eq.dec;em.X-ray double nullable sb_counts Soft-Band Counts ct phot;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 off_set Offset Between Optical/NIR/Radio and X-Ray Positions (arcsec) arcsec pos.angDistance double nullable