CDFN2MSNEW ivo://nasa.heasarc/cdfn2msnew 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 improved point-source catalog for the 2-Ms Chandra Deep Field-North (CDF-N) Survey, implementing a number of recent improvements in Chandra source-cataloguing methodology. For the CDF-N, the main catalog (entries from which are indicated with parameter values of source_sample = "Main" in this HEASARC representation) contains 683 X-ray sources detected with wavdetect at a false-positive probability threshold of 10<sup>-5</sup> that also satisfy a binomial-probability source-selection criterion of P <= 0.004. Such an approach maximizes the number of reliable sources detected: a total of 196 main-catalog sources are new compared to the Alexander et al. (2003, AJ, 126, 539) CDF-N main catalog. The authors also provide a CDF-N supplementary catalog that consist of 72 sources (entries from which are indicated with parameter values of source_sample = "Supp" in this HEASARC representation) detected at the same wavdetect threshold and having P of 0.004-0.1 and K<sub>s</sub> <= 22.9 mag counterparts. For all 755 CDF-N sources, including the 234 newly detected ones (these being generally fainter and more obscured), the authors determine X-ray source positions utilizing centroid and matched-filter techniques; they also provide multi-wavelength identifications, apparent magnitudes of counterparts, spectroscopic and/or photometric redshifts, basic source classifications, and estimates of observed active galactic nucleus and galaxy source densities around respective field centers. Simulations show that the CDF-N main catalog is highly reliable and reasonably complete. Background and sensitivity analyses indicate that the on-axis mean flux limits reached represent a factor of ~1.5-2.0 improvement over the previous CDF-N limit. The 2 Ms CDF-N consists of a total of 20 separate Chandra observations taken between 1999 November 13 and 2002 February 22 with ACIS (see Alexander et al., 2003, AJ, 126, 539 for more details). This table was created by the HEASARC in August 2016 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJS/224/15">CDS Catalog J/ApJS/224/15</a> files table3.dat (the main source catalog) and table6.dat (the supplementary source catalog). This is a service provided by NASA HEASARC . 2016ApJS..224...15X https://heasarc.gsfc.nasa.gov/W3Browse/all/cdfn2msnew.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=cdfn2msnew& GET text/xml 180 99999 true 189.23929167 62.01958333 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=cdfn2msnew GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_cdfn2msnew&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public cdfn2msnew Chandra Deep Field North 2-Megasecond Improved Point Source Cata source_number Sequential Identification Number for Each Source in the Specified Sample meta.id;src short nullable 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 Uncertainty arcsec stat.error;pos double nullable fb_counts_limit Limit Flag for Full-Band (0.5-7.0keV) Counts meta.code;phot;em.X-ray char nullable fb_counts Full-Band (0.5-7.0keV) Counts ct phot;em.X-ray double nullable fb_counts_neg_err Lower Uncertainty for Full-Band (0.5-7.0keV) Counts ct stat.error;phot;em.X-ray double nullable fb_counts_pos_err Upper Uncertainty for Full-Band (0.5-7.0keV) Counts ct stat.error;phot;em.X-ray double nullable fb_flux_limit Limit Flag for Full-Band Flux meta.code;phot.flux;em.X-ray char nullable fb_flux Full-Band Flux erg/s/cm^2 phot.flux;em.X-ray double nullable redshift Preferred Redshift Adopted by This Paper src.redshift 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_axis Off-Axis Angle arcmin instr.offset double nullable band_ratio_neg_err Lower Uncertainty for Band Ratio stat.error;phot.count;arith.ratio;em.X-ray double nullable photon_index_pos_err Upper Uncertainty for Photon Index stat.error;spect.index;em.X-ray double nullable phot_class Photometric Classification of Yang et al. Redshift src.class char nullable photon_index_neg_err Lower Uncertainty for Photon Index stat.error;spect.index;em.X-ray double nullable phot_class_sk Photometric Classification of Skelton et al. Photometric Redshift src.class char nullable wircam_ra WIRCam Ks-Band Right Ascension degree pos.eq.ra double nullable sb_counts_pos_err Upper Uncertainty for Soft-Band (0.5-2.0keV) Counts ct stat.error;phot;em.X-ray.soft double nullable sb_counts Soft-Band (0.5-2.0keV) Counts ct phot;em.X-ray.soft double nullable oir_ctrpart_catalog Originating Catalog of Optical/NIR/Radio Counterpart char nullable candels_ra CANDELS F160W-Band Right Ascension degree pos.eq.ra double nullable photon_index Photon Index spect.index;em.X-ray double nullable phot_redshift_sk_min Lower Limit on Skelton et al. Photometric Redshift src.redshift.phot;stat.min double nullable source_sample Field Indicates Published Table/Sample from Which the Entry Originates meta.ref;meta.table char nullable band_ratio Band Ratio (HB/SB) phot.count;arith.ratio;em.X-ray double nullable phot_redshift_min Lower Limit on Yang et al. Photometric Redshift src.redshift.phot;stat.min double nullable irac_ra IRAC 3.6um Right Ascension degree pos.eq.ra double nullable hb_flux Hard-Band Flux erg/s/cm^2 phot.flux;em.X-ray.medium double nullable irac_3p6_um_mag AB Magnitude of Spitzer/IRAC 3.6um Counterpart mag phot.mag;em.IR.3-4um double nullable phot_redshift_sk_flag Quality Flag for Skelton et al. Photometric Redshift meta.code;src.redshift.phot double nullable hb_counts_limit Limit Flag for Hard-Band (2.0-7.0keV) Counts meta.code;phot;em.X-ray.medium char nullable sb_flux Soft-Band Flux erg/s/cm^2 phot.flux;em.X-ray.soft double nullable phot_redshift_sk_max Upper Limit on Skelton et al. Photometric Redshift src.redshift.phot;stat.max double nullable oir_dec Optical/NIR/Radio Counterpart Declination degree pos.eq.dec double nullable spec_redshift Secure Spectroscopic Redshift src.redshift double nullable band_ratio_pos_err Upper Uncertainty for Band Ratio stat.error;phot.count;arith.ratio;em.X-ray double nullable phot_redshift Yang et al. 2014, J/ApJS/215/27, Photometric Redshift src.redshift.phot double nullable hb_counts_neg_err Lower Uncertainty for Hard-Band (2.0-7.0keV) Counts ct stat.error;phot;em.X-ray.medium double nullable hb_exposure Hard-Band Effective Exposure Time s time.duration;obs.exposure;em.X-ray.medium double nullable goodsn_ra GOODS-N z-Band Right Ascension degree pos.eq.ra double nullable hb_flux_limit Limit Flag for Hard-Band Flux meta.code;phot.flux;em.X-ray.medium char nullable candels_mag AB Magnitude of CANDELS F160W-Band Counterpart mag phot.mag;em.IR.H double nullable phot_redshift_flag Quality Flag for Yang et al. Photometric Redshift meta.code;src.redshift.phot double nullable hb_counts Hard-Band (2.0-7.0keV) Counts ct phot;em.X-ray.medium double nullable sb_flux_limit Limit Flag for Soft-Band Flux meta.code;phot.flux;em.X-ray.soft char nullable vla_dec VLA 1.4GHz Declination degree pos.eq.dec double nullable sb_exposure Soft-Band Effective Exposure Time s time.duration;obs.exposure;em.X-ray.soft double nullable hb_counts_pos_err Upper Uncertainty for Hard-Band (2.0-7.0keV) Counts ct stat.error;phot;em.X-ray.medium double nullable fb_exposure Full-Band Effective Exposure Time s time.duration;obs.exposure;em.X-ray double nullable phot_redshift_alt Alternative Yang et al. 2014, J/ApJS/215/27, Photometric Redshift src.redshift.phot double nullable oir_ra Optical/NIR/Radio Counterpart Right Ascension degree pos.eq.ra double nullable bii Galactic Latitude degree pos.galactic.lat double nullable ref_spec_redshift Reference Code for Secure Spectroscopic Redshift meta.ref;src.redshift short nullable broad_type Source Type (AGN, Galaxy, or Star) src.class char nullable phot_redshift_max Upper Limit on Yang et al. Photometric Redshift src.redshift.phot;stat.max double nullable note_flag Flag [C] Indicates Additional Note: C=Close Doubles or Triples char nullable supcam_dec Suprime-Cam R-Band Declination degree pos.eq.dec double nullable irac_dec IRAC 3.6um Declination degree pos.eq.dec double nullable wircam_dec WIRCam Ks-Band Declination degree pos.eq.dec double nullable off_set Offset Between Optical/NIR/Radio Counterpart and X-Ray Positions arcsec pos.angDistance double nullable lii Galactic Longitude degree pos.galactic.lon double nullable psf_flag Flag Indicates Source Shows a Radial Profile Consistent with Local PSF meta.code;instr.det.psf short nullable sb_counts_limit Limit Flag for Soft-Band (0.5-2.0keV) Counts meta.code;phot;em.X-ray.soft char nullable goodsn_mag AB Magnitude of GOODS-N z-Band Counterpart mag phot.mag;em.opt.I double nullable supcam_ra Suprime-Cam R-Band Right Ascension degree pos.eq.ra double nullable wircam_mag AB Magnitude of CFHT/WIRCam Ks-Band Counterpart mag phot.mag;em.IR.K double nullable a03_ra A03 CDFN Right Ascension degree pos.eq.ra double nullable vla_mag AB Magnitude of VLA 1.4GHz Counterpart mag phot.mag;em.radio.750-1500MHz double nullable lx Absorption-Corrected, Rest-Frame 0.5-7keV Luminosity erg/s phys.luminosity;em.X-ray double nullable goodsn_dec GOODS-N z-Band Declination degree pos.eq.dec double nullable a03_source_number A03 CDFN Source Identification meta.id.cross char nullable supcam_mag AB Magnitude of Subaru/SuprimeCam R-Band Counterpart mag phot.mag;em.opt.R double nullable class Browse Object Classification src.class short nullable sb_counts_neg_err Lower Uncertainty for Soft-Band (0.5-2.0keV) Counts ct stat.error;phot;em.X-ray.soft double nullable log_prob_false_pos Logarithm of Minimum False-Positive Probability stat.probability;src;em.X-ray short nullable vla_ra VLA 1.4GHz Right Ascension degree pos.eq.ra double nullable log_prob_no_src Logarithm of Binomial No-Source Probability stat.probability;src;em.X-ray double nullable oir_ctrpart_mag AB Magnitude of Optical/NIR/Radio Counterpart mag phot.mag double nullable phot_redshift_sk Skelton et al. 2014, J/ApJS/214/24, Photometric Redshift src.redshift.phot double nullable candels_dec CANDELS F160W-Band Declination degree pos.eq.dec double nullable a03_dec A03 CDFN Declination degree pos.eq.dec double nullable