Chandra Lockman Area North Survey (CLANS) X-Ray Source Catalog

Chandra Lockman Area North Survey (CLANS) X-Ray Source Catalog CLANS ivo://nasa.heasarc/clans NASA/GSFC HEASARC Trouille et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains the catalogs for the X-ray sources detected in the Chandra Lockman Area North Survey (CLANS). (The information on the optical and infrared counterparts to these sources is contained in the CLANSOID table.) The nine ACIS-I fields which constitute the CLANS cover a solid angle of ~0.6 deg2 and reach fluxes of 7 x 10-16 ergs cm-2 s-1 (0.5-2 keV) and 3.5 x 10-15 ergs cm-2 s-1 (2-8 keV). The authors find a total of 761 X-ray point sources. The CLANS and CLASXS surveys bridge the gap between the ultra-deep pencil-beam surveys, such as the CDFs, and the shallower, very large-area surveys. As a result, they probe the X-ray sources that contribute the bulk of the 2-8 keV X-ray background and cover the flux range of the observed break in the log N-log S distribution. CLANS consists of nine separate 70 ks Chandra ACIS-I exposures centered at J2000.0 RA and Dec of (10 46,+59 01) (see Table 2 of the reference paper for the full observational details) which were combined to create an 0.6 deg2 image containing 761 sources. The CLANS observations consist of a raster with an ~2 arcminute overlap between contiguous pointings. Following the prescription in Yang et al. (2004, AJ, 128, 1501) for the CLASXS field, the authors merged the nine individual pointing catalogs to create the final CLANS X-ray catalog. For sources with more than one detection in the nine fields, they used the detection from the observation in which the effective area of the source was the largest. This table was created by the HEASARC in December 2008 based on the electronic versions of Tables 4 and 5 from the paper which were obtained from the ApJ web site. This is a service provided by NASA HEASARC . 2008ApJS..179....1T https://heasarc.gsfc.nasa.gov/W3Browse/all/clans.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=clans& GET text/xml 180 99999 true 161.05189 58.53875 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=clans GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_clans&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public clans Chandra Lockman Area North Survey (CLANS) X-Ray 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_flux The 0.5-8 keV Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray double nullable fb_flux_pos_err 1-Sigma Poisson Upper Error in Full-Band Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray double nullable fb_flux_neg_err 1-Sigma Poisson Lower Error in Full-Band Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray double nullable hardness_ratio Hardness Ratio phot.flux;arith.ratio;em.X-ray double nullable hardness_ratio_pos_err 1-Sigma Upper Error in Hardness Ratio stat.error;phot.flux;arith.ratio;em.X-ray double nullable hardness_ratio_neg_err 1-Sigma Lower Error in Hardness Ratio stat.error;phot.flux;arith.ratio;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_limit Limit Flag for Hard-Band Flux meta.code;phot.flux;em.X-ray.medium char nullable sb_counts_pos_err 1-Sigma Poisson Upper Error in Soft-Band counts ct stat.error;phot;em.X-ray.soft double nullable sb_counts Net 0.5-2 keV (Soft-Band) Counts ct phot;em.X-ray.soft double nullable hb_counts_neg_err 1-Sigma Poisson Lower Error in Hard-Band Counts ct stat.error;phot;em.X-ray.medium double nullable sb_flux_pos_err 1-Sigma Poisson Upper Error in Soft-Band Flux (erg/s/cm^2) erg/s/cm^2 stat.error;phot.flux;em.X-ray.soft double nullable off_axis Source Distance From Pointing Center (arcmin) arcmin instr.offset double nullable sb_flux The 0.5-2 keV (Soft-Band) Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray.soft double nullable sb_flux_limit Limit Flag for Soft-Band Flux meta.code;phot.flux;em.X-ray.soft char nullable spectral_index Power Law Photon Index spect.index;em.X-ray double nullable hb_flux_neg_err 1-Sigma Poisson Lower Error in Hard-Band Flux (erg/s/cm^2) erg/s/cm^2 stat.error;phot.flux;em.X-ray.medium double nullable fb_counts_neg_err 1-Sigma Poisson Lower Error in Full-Band Counts ct stat.error;phot;em.X-ray double nullable hardness_ratio_limit Limit Flag for Hardness Ratio meta.code;phot.flux;arith.ratio;em.X-ray char nullable lii Galactic Longitude degree pos.galactic.lon double nullable sb_exposure Effective 0.5-2 Exposure Time (s) s time.duration;obs.exposure double nullable hb_counts_pos_err 1-Sigma Poisson Upper Error in Hard-Band Counts ct stat.error;phot;em.X-ray.medium double nullable fb_counts Net 5-8 keV (Full-Band) Counts ct phot;em.X-ray double nullable spectral_index_neg_err 1-Sigma Lower Error in Spectral Index stat.error;spect.index;em.X-ray double nullable dec_error Wavdetect 95% Confidence Error in Declination arcsec stat.error;pos.eq.dec;meta.main double nullable source_number Sequential Identification Number for Each Source in Catalog meta.id;src short nullable spectral_index_pos_err 1-Sigma Upper Error in Spectral Index stat.error;spect.index;em.X-ray double nullable sb_flux_neg_err 1-Sigma Poisson Lower Error in Soft-Band Flux (erg/s/cm^2) erg/s/cm^2 stat.error;phot.flux;em.X-ray.soft double nullable fb_exposure Effective 0.5-8 Exposure Time (s) s time.duration;obs.exposure double nullable hb_counts Net 2-8 keV (Hard-Band) Counts ct phot;em.X-ray.medium double nullable ra_error Wavdetect 95% Confidence Error in Right Ascension arcsec stat.error;pos.eq.ra;meta.main double nullable bii Galactic Latitude degree pos.galactic.lat double nullable sb_counts_neg_err 1-Sigma Poisson Lower Error in Soft-Band Counts ct stat.error;phot;em.X-ray.soft double nullable hb_flux_pos_err 1-Sigma Poisson Upper Error in Hard-Band Flux (erg/s/cm^2) erg/s/cm^2 stat.error;phot.flux;em.X-ray.medium double nullable hb_exposure Effective 2-8 Exposure Time (s) s time.duration;obs.exposure double nullable fb_counts_pos_err 1-Sigma Poisson Upper Error in Full-Band Counts ct stat.error;phot;em.X-ray double nullable hb_flux The 2-8 keV (Hard-Band) Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray.medium double nullable