VLA ivo://nasa.heasarc/vlanep NASA/GSFC HEASARC Kollgaard et al. 2026-07-17 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The VLANEP database contains the VLA-NEP survey of 29.3 square degrees around the North Ecliptic Pole mapped with the VLA at 20 cm (1.5 GHz) in the `C-configuration`. The database table contains 2435 radio sources with flux densities ranging from 0.3 to 1000 mJy, including over 200 fainter than 1 mJy. Source positions have been corrected for instrumental effects, and most positions are accurate to less than 2 arcseconds. The sensitivity varies from field to field, with the 1 sigma level being approximately 0.06 mJy at the center of the inner fields and 0.12 mJy at the center of the outer fields. Sensitivity drops with distance from the center of each field due to the primary beam response of the VLA antennas and interferometer effects. Source flux densities have been corrected for these effects. The spatial resolution varies from field to field, with the typical HPBW being 20 arcseconds. Source positions have been corrected for instrumental effects, and most positions are accurate to less than 2 arcseconds. Approximately 6% of the sources were found to be extended with angular sizes greater than 30 arcseconds. This catalog was recreated at the HEASARC in February 2001 (replacing a previous version: some parameters were renamed, and the source names were changed to the format recommended for VLA-NEP sources in the Dictionary of Nomenclature of Celestial Objects maintained at the CDS) based on CDS/ADC Catalog J/ApJS/93/145/table2. This is a service provided by NASA HEASARC . 1994ApJS...93..145K https://heasarc.gsfc.nasa.gov/W3Browse/all/vlanep.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=vlanep& GET text/xml 180 99999 true 261.5845337 66.7040863 0.25 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=vlanep GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_vlanep&Action=More+Options&Action=Parameter+Search&ConeAdd=1 RADIO CATALOG 0.25 Radio public vlanep VLA 1.5-GHz North Ecliptic Pole Survey name Recommended 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 flux_20_cm Peak 20-cm (1.5-GHz) Flux Density (mJy) mJy phot.flux.density;em.radio.1500-3000MHz double nullable flux_20_cm_error RMS Error in Peak Flux Density mJy stat.error;phot.flux.density;em.radio.1500-3000MHz double nullable snr Signal-to-Noise Ratio of Detection (sigma) stat.snr int nullable id_flag Tentative ID with Other Catalogs meta.id.cross char nullable ext_flag Extended Radio Structure meta.code;phys.size char nullable pos_error Positional Accuracy arcsec stat.error;pos double nullable "distance" Distance of Source from Center arcmin pos.angDistance double nullable sus_flag Spurious Source Flag meta.code;src char nullable field_num Numerical Designation of VLA Field meta.id;obs.field short nullable separation Angular Separation of Features arcmin pos.angDistance double nullable lii Galactic Longitude degree pos.galactic.lon double nullable bii Galactic Latitude degree pos.galactic.lat double nullable fig_flag Image Shown in Figure meta.code char nullable rel_name Catalog Name for Related Feature meta.id char nullable int_flux_20_cm Total 20-cm (1.5-GHz) Flux Density mJy phot.flux.density;em.radio.1500-3000MHz double nullable position_angle Position Angle of Extended Emission degree pos.posAng int nullable int_flux_20_cm_error RMS Error in Total Flux Density mJy stat.error;phot.flux.density;em.radio.1500-3000MHz 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