WGACAT ivo://nasa.heasarc/wgacat NASA/GSFC HEASARC White, Giommi, Angelini 2026-07-17 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source WGACAT is a point source catalog generated from all ROSAT PSPC pointed observations. This catalog has been generated by N.E. White (HEASARC/GSFC), P. Giommi (SDC/ASI) and L. Angelini (HEASARC/GSFC) and is a private research effort, not related to the official catalogs generated by the ROSAT project. The WGACAT was made first publicly available in November 1994 through the HEASARC on-line service (White, Giommi and Angelini 1994), with a first minor revision in March 1995 (WGACAT95 hereafter). It was generated using all the public ROSAT PSPC pointed data available than, corresponding to 75 % of the entire set, and featured ~ 68000 detections of which 62000 were unique sources. The current version, released in May 2000 (see also the update section), is the final and complete version of WGACAT and includes the remaining sequences not processed in the WGACAT95. WGACAT (May 2000) contains about 88,000 detections, with more than 84,000 individual sources, obtained from 4160 sequences. The catalog was generated using an optimized sliding cell detect algorithm in XIMAGE (first developed for the EXOSAT project). The inner and outer parts of the images were run separately, to maximize the sensitivity to source detection. This method is very sensitive in finding point sources, but can also find spurious sources where there is extended emission. We have visually inspected each detection, removed the obvious spurious cases and assigned a quality flag to each detection. This is a service provided by NASA HEASARC . https://heasarc.gsfc.nasa.gov/W3Browse/all/wgacat.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=wgacat& GET text/xml 180 99999 true 151.4658333302 -85.50288888878 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=wgacat GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_wgacat&Action=More+Options&Action=Parameter+Search&ConeAdd=1 ROSAT 0.0166666666666667 X-ray public wgacat ROSAT Catalog PSPC WGA Sources name 1WGA J1223-3751 (use j2000 hrmn.s-dgmn) meta.id;meta.main char nullable ra Source Right Ascension degree pos.eq.ra;meta.main double nullable dec Source Declination degree pos.eq.dec;meta.main double nullable off_set Offset from Target Position arcmin instr.offset float nullable qflag Quality Flag meta.code.qual short nullable count_rate Source Count Rate ct/s phot.count;em.X-ray.soft float nullable class Browse Object Classification src.class short nullable id Input File Number meta.id char 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 softness_ratio_error Error on SR stat.error;phot.count;em.X-ray.soft;arith.ratio float nullable ipc_pspc_ratio_error Ratio of IPC/PSPC Count Rates stat.error;phot.flux;arith.ratio float nullable mid_band_error sqrt(Band2) ct/s stat.error;phot.count;em.X-ray.soft float nullable flux_20_cm Radio Flux (mJy) at 20 cm mJy phot.flux.density;em.radio.1500-3000MHz float nullable fx PSPC X-ray Flux erg/cm^2/s phot.flux;em.X-ray float nullable target_ra Target Right Ascension degree pos.eq.ra;obs double nullable field_name Field Name meta.id;obs.field char nullable end_time End Time of Observation mjd time.end;obs double nullable hardness_ratio_error Error on HR stat.error;phot.count;arith.ratio float nullable dec_1950 Source Dec in 1950 degree pos.eq.dec double nullable sr_hard Softness Ratio (50-86/87-129) phot.count;em.X-ray.soft;arith.ratio float nullable sr_hard_error Error on SR Hard stat.error;phot.count;em.X-ray.soft;arith.ratio float nullable del_dec Delta Dec arcsec double nullable xid_1 XID 1 meta.id.cross;em.X-ray char nullable ctr_offset Offset from Image Center arcmin instr.offset double nullable lii Galactic Longitude degree pos.galactic.lon float nullable xid X-ray Id? 1=yes meta.code;em.X-ray short nullable half_box Optimum Source Box Size arcsec float nullable high_band Band3 (86-200) count/s ct/s phot;em.X-ray float nullable xid_4 XID 4 meta.id.cross;em.X-ray char nullable lc_max LC Max double nullable x_pixel Source X Coordinate in Original Pixels pos.cartesian.x;instr.pixel float nullable iddec Dec of ID Star degree pos.eq.dec double nullable xid_2 XID 2 meta.id.cross;em.X-ray char nullable bii Galactic Latitude degree pos.galactic.lat float nullable oid_3 OID 3 meta.id.cross char nullable nh_21cm 21-cm NH thru the Galaxy H cm**-2 atoms/cm^2 phys.columnDensity float nullable aro Radio Optical Index spect.index;em.X-ray;em.radio float nullable mpe_count_rate_error MPE Count Rate Error ct/s stat.error;phot.count;em.X-ray.soft float nullable irid IRAS ID, 1=yes meta.id.cross short nullable total_counts Total Counts Detected float nullable oid Optical Id? 1=yes meta.code;em.opt short nullable mpeid MPE ID meta.id.cross short nullable ra_1950 Source RA in 1950 degree pos.eq.ra double nullable vignet Vignetting Correction arcmin instr.param float nullable chi2 Chi^2 Variability KS Test (>10.0 is variable) stat.fit.chi2;src.var float nullable lc_exp_variance Expected Variance in the LC double nullable flux_10_micron 10-micron IRAS Flux Jy phot.flux;em.IR.8-15um float nullable "region" i=in or o=out (from file extension (_in or _out) meta.code char nullable origin 1 for WGACAT (old), 2 for WGACAT2 (new) meta.version int nullable photons Photons in the Event int nullable gsc_sequence GSC Sequence Number meta.id.cross int nullable flux_60_micron 60-micron IRAS Flux Jy phot.flux;em.IR.30-60um float nullable bv_color B-V Color phot.color;em.opt.B;em.opt.V float nullable mpe_count_rate MPE Count Rate ct/s phot.count;em.X-ray.soft float nullable idcat Catalog from which ID Coordinates Obtained meta.id;meta.dataset char nullable ipc_count_rate IPC Count Rate ct/s phot.count;em.X-ray.soft float nullable ndetect Number of Detections in Field int nullable flux_80_cm Radio Flux (mJy) at 80 cm mJy phot.flux.density;em.radio.200-400MHz float nullable idned OID 5 meta.id.cross char nullable low_band_error sqrt(Band1) ct/s stat.error;phot.count;em.X-ray.soft float nullable irname IRAS Name meta.id char nullable idsimbad OID 6 meta.id.cross char nullable ctr_dec Image Center Dec degree pos.eq.dec;obs double nullable gsc GSC id? 1=yes meta.code;src short nullable rid_1 RID 1 meta.id.cross;em.radio char nullable exposure Exposure Time of Field s time.duration;obs.exposure int nullable oid_2 OID 2 meta.id.cross char nullable imagefile Input File Name meta.dataset;meta.file;obs.image char nullable total_counts_error Error in Total Counts stat.error;phot float nullable hr_hard_error Error on HR Hard stat.error;phot.count;arith.ratio float nullable redshift Redshift of Counterpart src.redshift float nullable ext GSC Extended Flag meta.code;src char nullable softness_ratio Softness Ratio (11-39/40-85) phot.count;em.X-ray.soft;arith.ratio float nullable flux_25_micron 25-micron IRAS Flux Jy phot.flux;em.IR.15-30um float nullable mid_band Band2 (40-85) count/s ct/s phot.count;em.X-ray.soft float nullable low_band Band1 (11-39) count/s ct/s phot.count;em.X-ray.soft float nullable qv_mag GSC QV MAG phot.mag;em.opt.V float nullable flux_6_cm Radio Flux (mJy) at 6 cm mJy phot.flux.density;em.radio.3-6GHz float nullable gsc_region GSC Region Number meta.id.cross;obs.field short nullable rid Radio Id? 1=yes meta.code;em.radio short nullable count_rate_error Count Rate Error ct/s stat.error;phot.count;em.X-ray.soft float nullable lc_variance Variance in the LC double nullable lc_chi2 LC Chi^2 double nullable y_pixel Source Y Coordinate in Original Pixels pos.cartesian.y;instr.pixel float nullable ror ROR Number meta.id;obs.field int nullable version Version meta.version char nullable high_band_error sqrt(Band3) ct/s stat.error;phot;em.X-ray float nullable fxfo X-ray over Optical Flux phot.flux;arith.ratio float nullable rid_3 RID 3 meta.id.cross;em.radio char nullable idra RA of ID Star degree pos.eq.ra double nullable snr Signal-to-Noise Ratio stat.snr float nullable ipc_pspc_ratio Ratio of IPC/PSPC Count Rates phot.flux;arith.ratio float nullable qb_mag GSC QB MAG phot.mag;em.opt.B float nullable bgnd Background counts/original-pixel/s ct/pixel/s phot.count;instr.background;em.X-ray float nullable "time" Start Time mjd time.epoch double nullable id_no Source Number in Field meta.id int nullable target_dec Target Declination degree pos.eq.dec;obs double nullable vmag V Magnitude phot.mag;em.opt.V float nullable eventfile rp123455 meta.id;meta.file char nullable mpe_name MPE Name meta.id char nullable probability Probability stat.likelihood float nullable idoffset Offset of ID from ROSAT Position arcmin pos.angDistance float nullable hardness_ratio Hardness Ratio (86-200/40-85) phot.count;arith.ratio float nullable ctr_ra Image Center RA degree pos.eq.ra;obs double nullable lc_min LC Min double nullable error_radius Source Error Radius arcsec stat.error;pos int nullable del_ra Delta RA arcsec pos.eq.ra;arith.diff double nullable lc_bin_number Good Bin in LC After Rebinning int nullable ipc_count_rate_error IPC Count Rate Error ct/s stat.error;phot.count;em.X-ray.soft float nullable oid_4 OID 4 meta.id.cross char nullable rid_2 RID 2 meta.id.cross;em.radio char nullable flux_100_micron 100-micron IRAS Flux Jy phot.flux;em.IR.60-100um float nullable xid_3 XID 3 meta.id.cross;em.X-ray char nullable aox Optical to X-ray Slope spect.index;em.X-ray;em.opt float nullable hr_hard hardness ratio (130-240/87-129) phot.count;arith.ratio float nullable sihi Radio Spectral Index Between 6 and 20 cm float nullable zoom rebinning factor instr.param int nullable oid_1 OID 1 meta.id.cross char nullable