North20cm ivo://nasa.heasarc/north20cm NASA/GSFC HEASARC White, Becker 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The 1.4-GHz Northern Sky Catalog - Version: 4 December 1991 This is the 20-cm Northern Sky Catalog of White, R. L. and Becker, R. H. (1992, Ap.J.Supp., in press) containing 30,239 sources detected from the Condon Greenbank images taken at 1.4 GHz over the declination range of -5 degrees to 82 degrees with a flux density limit of 100 mJy. This 20 cm catalog also contains the results of a cross-correlation with catalogs at 6 and 80 cm covering the northern sky between Dec=0 degrees and 70 degrees to give the spectral indices at three frequencies for about 20,000 sources. This is a service provided by NASA HEASARC . 1992ApJS...79..331W https://heasarc.gsfc.nasa.gov/W3Browse/all/north20cm.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=north20cm& GET text/xml 180 99999 true 104.771458334843 -6.33119776268849 0.25 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=north20cm GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_north20cm&Action=More+Options&Action=Parameter+Search&ConeAdd=1 RADIO CATALOG 0.25 Radio public north20cm 20cm Radio 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 flux_20_cm Radio Flux at 20 cm mJy phot.flux.density;em.radio.750-1500MHz float nullable flux_6_cm Radio Flux at 6 cm mJy phot.flux.density;em.radio.3-6GHz float nullable flux_80_cm Radio Flux at 80 cm mJy phot.flux.density;em.radio.200-400MHz float 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 nh NH Galactic Absorption from 21 cm (Note: All values are zero) phys.absorption float nullable ext_20_flag Flag if Source Extended at 20 cm meta.code;phys.angSize;em.radio.750-1500MHz char nullable wid_flag Flag Indicates 4.85- and 0.365-GHz Sources Separated by More Than 100 arcsec meta.code;src char nullable confusion_flag ? = 20 cm matched multiple 6/80 source meta.code.multip char nullable ext_6_flag Flag if Source Extended at 6cm meta.code;phys.angSize;em.radio.3-6GHz char nullable lii Galactic Longitude degree pos.galactic.lon float nullable sihi 6- to 20-cm Spectral Index spect.index;em.radio.3-6GHz;em.radio.750-1500MHz float nullable bii Galactic Latitude degree pos.galactic.lat float nullable silo 20- to 80-cm Spectral Index spect.index;em.radio.750-1500MHz;em.radio.200-400MHz float nullable