ELAISCXO ivo://nasa.heasarc/elaiscxo NASA/GSFC HEASARC Manners et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains the results of an analysis of two deep (75 ks) Chandra observations of the European Large Area Infrared Space Observatory (ISO) Survey (ELAIS) fields N1 and N2 as the first results from the ELAIS deep X-ray survey. This survey is being conducted in well-studied regions with extensive multiwavelength coverage. This table contains the Chandra source catalogs along with an analysis of source counts and hardness ratios. A total of 233 X-ray point sources were detected in addition to two soft extended sources (not included in this table of point sources), which are found to be associated with galaxy clusters. An overdensity of sources is found in N1 with 30 per cent more sources than N2, which the authors attribute to large-scale structure. A similar variance is seen between other deep Chandra surveys. The source count statistics reveal an increasing fraction of hard sources at fainter fluxes. The number of galaxy-like counterparts also increases dramatically towards fainter fluxes, consistent with the emergence of a large population of obscured sources. The ELAIS Deep X-ray Survey (EDXS) is being conducted in the northern ELAIS regions N1 and N2. The Chandra data consist of approximately 75 ks exposures in each field. Region N1 was observed on 2000 August 3-4 (Obs_ID 888) and N2 on 2000 August 2-3 (Obs_ID 887). The nominal aimpoints were 16:10:20.11 +54:33:22.3 for N1, and 16:36:46.99 +41:01:33.7 for N2 in J2000.0 coordinates. The ACIS-I chips were used with the addition of the ACIS-S2 and ACIS-S4 chips. This table was created by the HEASARC in February 2007 based on the <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/MNRAS/343/293">CDS catalog J/MNRAS/343/293</a> files table1.dat and table2.dat. This is a service provided by NASA HEASARC . 2003MNRAS.343..293M https://heasarc.gsfc.nasa.gov/W3Browse/all/elaiscxo.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=elaiscxo& GET text/xml 180 99999 true 249.39379167 40.84630556 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=elaiscxo GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_elaiscxo&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public elaiscxo ELAIS N1 and N2 Fields Chandra X-Ray Point Source Catalog name Catalog Source Designation: CXOEN# JHHMMSS.s+DDMMSS 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 counts Net Counts ct phot;em.X-ray double nullable snr Signal-to-Noise Ratio stat.snr double nullable hardness_ratio Hardness Ratio phot.flux;arith.ratio;em.X-ray.medium;em.X-ray.soft double nullable hardness_ratio_error RMS Uncertainty for Hardness Ratio stat.error;phot.flux;arith.ratio;em.X-ray.medium;em.X-ray.soft double nullable sb_flux_error RMS Uncertainty for the 0.5-2keV Flux erg/cm^2/s double nullable hb_flux_limit Limit Flag for 2-8keV Flux char nullable fb_flux_limit Limit Flag for 0.5-2keV Flux char nullable fb_flux_error RMS Uncertainty for the 0.5-8keV Flux erg/cm^2/s double nullable bii Galactic Latitude degree pos.galactic.lat double nullable sb_flux_limit Limit Flag for 0.5-2keV Flux char nullable hb_flux_error RMS Uncertainty for the 2-8keV Flux erg/cm^2/s double nullable hb_flux Flux (2-8keV) (erg/cm^2/s) erg/cm^2/s double nullable source_number Catalog Source Identification Number (N1-NNN or N2-NNN) meta.id char nullable fb_flux Flux (0.5-8keV) (erg/cm^2/s) erg/cm^2/s double nullable sb_flux Flux (0.5-2keV) (erg/cm^2/s) erg/cm^2/s double nullable alt_name Alternative Catalog Source Designation meta.id char nullable lii Galactic Longitude degree pos.galactic.lon double nullable error_radius Uncertainty in Position (arcsec) arcsec stat.error;pos 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