SMCWINGCXO ivo://nasa.heasarc/smcwingcxo NASA/GSFC HEASARC McGowan et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The authors have detected 523 X-ray sources in a survey of the Small Magellanic Cloud (SMC) Wing with the Chandra X-ray Observatory. By cross-correlating the X-ray data with optical and near-infrared catalogs, they have found 300 matches. Using a technique that combines X-ray colors and X-ray to optical flux ratios, they have been able to assign preliminary classifications to 265 of the objects. The identifications include 4 pulsars, 1 high-mass X-ray binary (HMXB) candidate, 34 stars and 185 active galactic nuclei (AGN). In addition, the authors have classified 32 sources as hard AGN which are likely absorbed by local gas and dust, and 9 soft AGN whose nature is still unclear. Considering the abundance of HMXBs discovered so far in the Bar of the SMC the number that have been detected in the Wing is low. Observations in the Wing of the SMC were made from 2005 July to 2006 March with Chandra. The survey consisted of 20 fields, with exposure times ranging from 8.6 - 10.3 ks. X-ray parameters for 523 sources detected in the Wing of the SMC with Chandra are presented. For each source equatorial coordinates, positional error, net counts (total counts minus background counts) in the 0.5 - 8.0 keV band, signal-to-noise of the detection and source flux in the 0.5 - 8.0 keV band are given. The median, compressed median and normalized quartile ratio of the photon energy distribution, determined using quantile analysis, are given for sources with three or more counts. For the sources that have optical counterparts the V- and R-band magnitudes, B-V color, X-ray to optical flux ratios based on the V- and R-band magnitudes, and a preliminary classification for the sources are given. This table was created by the HEASARC in June 2008 based on the <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/MNRAS/383/330">CDS Catalog J/MNRAS/383/330</a> file table2.dat. This is a service provided by NASA HEASARC . 2008MNRAS.383..330M https://heasarc.gsfc.nasa.gov/W3Browse/all/smcwingcxo.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=smcwingcxo& GET text/xml 180 99999 true 18.85608333 -73.75430556 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=smcwingcxo GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_smcwingcxo&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public smcwingcxo Small Magellanic Cloud Wing Survey Chandra X-Ray Point Source Ca 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 Position Mean Error (arcsec) arcsec stat.error;pos double nullable counts Net Counts ct phot;em.X-ray short nullable snr Signal-to-Noise Ratio stat.snr;phot;em.X-ray double nullable flux X-Ray Flux (0.5-8.0keV Band) (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray double nullable vmag Magnitude (Apparent) in V Filter mag phot.mag;em.opt.V double nullable bv_color B-V Color Index phot.color;em.opt.B;em.opt.V double nullable class Browse Object Classification src.class short nullable bii Galactic Latitude degree pos.galactic.lat double nullable source_number Sequential Identification Number for Each X-Ray Source in Catalog meta.id;src short nullable lii Galactic Longitude degree pos.galactic.lon double nullable compressed_median Compressed Median, log(m/(1-m)) meta.code;phys.energy double nullable median_energy Median of Photon Energy Distribution (keV) keV phys.energy double nullable rmag Magnitude (Apparent) in R Filter mag phot.mag;em.opt.R double nullable fx_hard_over_fv Ratio of Hard (2-10keV) X-Ray Flux to V Filter Flux phot.flux;arith.ratio double nullable source_type Classification of Source src.class char nullable log_fx_soft_over_fr Ratio of Soft (0.5-2 keV) X-Ray Flux to R Filter Flux phot.flux;arith.ratio double nullable energy_quartile_ratio Normalized Quartile Ratio of Photon Energy Distribution stat.param;phys.energy 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