SSA22 Field Chandra X-Ray Point Source Catalog

SSA22 Field Chandra X-Ray Point Source Catalog SSA22CXO ivo://nasa.heasarc/ssa22cxo NASA/GSFC HEASARC Lehmer et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains the main X-ray point-source catalog for a deep ~400-ks Chandra ACIS-I (Advanced CCD Imaging Spectrometer) exposure of the SSA22 field. The observations were centred on a z = 3.09 protocluster, which is populated by Lyman break galaxies (LBGs), Lyman-alpha emitters (LAEs) and extended Lyman-alpha-emitting blobs (LABs). The survey reached ultimate (3 count) sensitivity limits of ~5.7 x 10-17 and ~3.0 x 10-16 erg cm-2 s-1 for the 0.5-2 and 2-8 keV bands, respectively (corresponding to L(2-10 keV) ~ 5.7 x 1042 erg s-1 and L(10-30 keV) ~ 2.0 x 1043 erg s-1 at z = 3.09, respectively, for an assumed photon index of Gamma = 1.4). These limits make SSA22 the fourth deepest extragalactic Chandra survey yet conducted, and the only one focused on a known high-redshift structure. In total, the authors detect 297 X-ray point sources and identify one obvious bright extended X-ray source (not included in the current table) over a ~330 arcmin2 region. In addition to the X-ray data, the authors provide all available optical spectroscopic redshifts and near-infrared and mid-infrared photometry available for their sources. The basic X-ray and infrared properties of their Chandra sources indicate a variety of source types, although absorbed active galactic nuclei (AGN) appear to dominate. In total, they have identified 12 X-ray sources (either via optical spectroscopic redshifts or LAE selection) at z = 3.06 - 3.12 that are likely to be associated with the SSA22 protocluster. These sources have X-ray and multiwavelength properties that suggest they are powered by AGN with 0.5 - 8 keV luminosities in the range of ~ 1043 - 1045 erg s-1. The authors have analysed the AGN fraction of sources in the protocluster as a function of local LAE source density and find suggestive evidence for a correlation between AGN fraction and local LAE source density (at the ~96 per cent confidence level), implying that supermassive black hole growth at z ~3 is strongest in the highest density regions. This table was created by the HEASARC in February 2010 based on the electronic version of Table 2 from the reference paper which was obtained from the Monthly Notices web site. This is a service provided by NASA HEASARC . 2009MNRAS.400..299L https://heasarc.gsfc.nasa.gov/W3Browse/all/ssa22cxo.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=ssa22cxo& GET text/xml 180 99999 true 334.29341667 0.10108333 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=ssa22cxo GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_ssa22cxo&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public ssa22cxo SSA22 Field Chandra 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 Positional Error (arcsec) arcsec stat.error;pos double nullable off_axis Off-Axis Angle (arcmin) arcmin instr.offset double nullable fb_counts_limit Limit Flag for Full-Band Counts meta.code;phot;em.X-ray char nullable fb_counts Full-Band Counts ct phot;em.X-ray double nullable fb_counts_pos_err Full-Band Counts Upper Uncertainty ct stat.error;phot;em.X-ray double nullable fb_counts_neg_err Full-Band Counts Lower Uncertainty 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) erg/s/cm^2 phot.flux;em.X-ray double nullable vmag Subaru V-Band Magnitude (AB) mag phot.mag;em.opt.V double nullable irac_4p5_um_mag Spitzer IRAC 4.5um AB Magnitude mag phot.mag;em.IR.4-8um double nullable ir_ra K-Band Right Ascension degree pos.eq.ra;em.IR double nullable band_ratio_neg_err Band Ratio (HB/SB) Lower Uncertainty stat.error;arith.ratio;phot.count;em.X-ray double nullable irac_5p8_um_mag Spitzer IRAC 5.8um AB Magnitude mag phot.mag;em.IR.4-8um double nullable sb_counts_neg_err Soft-Band Counts Lower Uncertainty ct stat.error;phot;em.X-ray.soft double nullable imag Subaru i-Band Magnitude (AB) mag phot.mag;em.opt.I double nullable hb_counts Hard-Band Counts ct phot;em.X-ray.medium double nullable alt_name Alternative Catalog-Based Source Designation meta.id char nullable spectral_index_neg_err Photon Index Lower Uncertainty stat.error;spect.index;em.X-ray double nullable hb_flux Hard-Band Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray.medium double nullable spectral_index_pos_err Photon Index Upper Uncertainty stat.error;spect.index;em.X-ray double nullable band_ratio_pos_err Band Ratio (HB/SB) Upper Uncertainty stat.error;arith.ratio;phot.count;em.X-ray double nullable kmag K-Band Magnitude (Vega) mag phot.mag;em.IR.K double nullable sb_flux Soft-Band Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray.soft double nullable hb_exposure Hard-Band Effective Exposure Time (s) s time.duration;obs.exposure;em.X-ray.medium int nullable zmag Subaru z-Band Magnitude (AB) mag phot.mag;em.opt double nullable irac_8p0_um_mag Spitzer IRAC 8.0um AB Magnitude mag phot.mag;em.IR.4-8um double nullable cxo_ir_offset Offset of K-Band and X-Ray Positions arcsec pos.angDistance;em.X-ray;em.IR double nullable hb_counts_limit Limit Flag for Hard-Band Counts meta.code;phot;em.X-ray.medium char nullable sb_counts_pos_err Soft-Band Counts Upper Uncertainty ct stat.error;phot;em.X-ray.soft double nullable hb_counts_neg_err Hard-Band Counts Lower Uncertainty ct stat.error;phot;em.X-ray.medium double nullable hb_counts_pos_err Hard-Band Counts Upper Uncertainty ct stat.error;phot;em.X-ray.medium double nullable band_ratio Band Ratio (HB/SB) phot.count;arith.ratio;em.X-ray double nullable ir_dec K-Band Declination degree pos.eq.dec;em.IR double nullable hb_flux_limit Limit Flag for Hard-Band Flux meta.code;phot.flux;em.X-ray.medium char nullable redshift Best Available Optical Spectroscopic Redshift src.redshift double nullable irac_3p6_um_mag Spitzer IRAC 3.6um AB Magnitude mag phot.mag;em.IR.3-4um double nullable notes Notes (see Lehmer et al. 2009 for details) meta.note char nullable bmag Subaru B-Band Magnitude (AB) mag phot.mag;em.opt.B double nullable rmag Subaru R-Band Magnitude (AB) mag phot.mag;em.opt.R double nullable lii Galactic Longitude degree pos.galactic.lon double nullable sb_counts_limit Limit Flag for Soft-Band Counts meta.code;phot;em.X-ray.soft char nullable bii Galactic Latitude degree pos.galactic.lat double nullable exposure Full-Band Effective Exposure Time (s) s time.duration;obs.exposure;em.X-ray int nullable source_number Sequential Identification Number for Each Source in Catalog meta.id;src int nullable ref_redshift Spectroscopic Survey Used to Determine Redshift meta.ref;src.redshift short nullable sb_flux_limit Limit Flag for Soft-Band Flux meta.code;phot.flux;em.X-ray.soft char nullable ae_detect_prob ACIS Extract Detection Probability (1-P) stat.probability double nullable sb_exposure Soft-Band Effective Exposure Time (s) s time.duration;obs.exposure;em.X-ray.soft int nullable sb_counts Soft-Band Counts ct phot;em.X-ray.soft double nullable spectral_index Photon Index spect.index;em.X-ray double nullable log_min_wavdetect_prob Logarithm Minimum WAVDETECT Detection Probability stat.probability 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