Australia Telescope 20-GHz Survey Bright Source Sample AT20GBSS ivo://nasa.heasarc/at20gbss NASA/GSFC HEASARC Massardi et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The Australia Telescope 20-GHz (AT20G) Survey is a blind survey of the whole southern sky at 20 GHz (with follow-up observations at 4.8 and 8.6 GHz) carried out with the Australia Telescope Compact Array from 2004 to 2007. The Bright Source Sample (BSS) is a complete flux-limited sub-sample of the AT20G Survey catalog comprising 320 extragalactic (|b| &gt; 1.5 degrees) radio sources south of declination -15 degrees with 20-GHz flux densities S&lt;sub&gt;20GHz&lt;/sub&gt; &gt; 0.50 Jy (500 mJy). Of these sources, 218 have near simultaneous observations at 8 and 5 GHz. In the reference paper, the authors present an analysis of the radio spectral properties in total intensity and polarization, size, optical identifications and redshift distribution of the BSS sources. Optical identifications provided an estimation of redshift for 186 sources with median values of 1.20 and 0.13 for QSOs and galaxies, respectively. This table was created by the HEASARC in August 2008 based on the &lt;a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/MNRAS/384/775"&gt;CDS Catalog J/MNRAS/384/775&lt;/a&gt; files table2.dat and table3.dat. This is a service provided by NASA HEASARC . 2008MNRAS.384..775M https://heasarc.gsfc.nasa.gov/W3Browse/all/at20gbss.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=at20gbss& GET text/xml 180 99999 true 178.223625 -83.73630556 0.05 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=at20gbss GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_at20gbss&Action=More+Options&Action=Parameter+Search&ConeAdd=1 RADIO CATALOG 0.05 Radio public at20gbss Australia Telescope 20-GHz Survey Bright Source Sample 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_1p5_cm_limit Limit Flag for Flux Density at 20 GHz meta.code;phot.flux.density;em.radio.12-30GHz char nullable flux_1p5_cm Flux Density at 20 GHz (mJy) mJy phot.flux.density;em.radio.12-30GHz double nullable flux_1p5_cm_error RMS Uncertainty on Flux Density at 20 GHz (mJy) mJy stat.error;phot.flux.density;em.radio.12-30GHz double nullable alt_name Alternative Designation (PMN, PKS, NVSS, ...) meta.id char nullable lii Galactic Longitude degree pos.galactic.lon double nullable redshift Redshift of Source src.redshift double nullable epoch_6_cm Flag [1-5] Indicates Epoch of Observation at 5 GHz meta.code char nullable calibrator_flag Flag [C] Indicates Source Listed in the AT Calibrator Manual meta.code char nullable bj_mag Bj Magnitude mag phot.mag;em.opt.B double nullable pol_percent_3p5_cm Fractional Polarization at 8 GHz percent phys.polarization.linear;em.radio.6-12GHz double nullable flux_36_cm_error RMS Uncertainty in SUMSS Flux Density at 843 MHz (mJy) mJy stat.error;phot.flux.density;em.radio.750-1500MHz double nullable flux_20_cm NVSS Flux Density at 1.4 GHz (mJy) mJy phot.flux.density;em.radio.750-1500MHz double nullable bii Galactic Latitude degree pos.galactic.lat double nullable spectral_shape_flag Flag [FIPSU] Indicates Spectral Shape meta.code char nullable flux_36_cm SUMSS Flux Density at 843 MHz (mJy) mJy phot.flux.density;em.radio.750-1500MHz double nullable pol_flux_6_cm Integrated Polarized Flux at 5GHz (mJy) mJy phys.polarization.linear;phot.flux.density;em.radio.3-6GHz double nullable flux_6_cm Flux Density at 5 GHz (mJy) mJy phot.flux.density;em.radio.3-6GHz double nullable flux_3p5_cm Flux Density at 8 GHz (mJy) mJy phot.flux.density;em.radio.6-12GHz double nullable second_epoch_1p5_cm Flag [1-6] Indicates Second Epoch of the 20-GHz, 8GHz and 5GHz Observations time.epoch char nullable epoch_3p5_cm Flag [1-5] Indicates Epoch of Observation at 8 GHz meta.code char nullable pol_flux_6_cm_error RMS Uncertainty in Integrated Polarized Flux at 5GHz (mJy) mJy stat.error;phys.polarization.linear;em.radio.3-6GHz double nullable pol_flux_3p5_cm Integrated Polarized Flux at 8.6GHz (mJy) mJy phys.polarization.linear;phot.flux.density;em.radio.6-12GHz double nullable source_number Sequential Identification Number for Each Source in Catalog meta.id;src short nullable pol_angle_3p5_cm Polarization Angle at 8 GHz degree phys.polarization.linear;em.radio.6-12GHz short nullable ref_redshift Reference Code for Redshift meta.ref;src.redshift char nullable note_flag Flag [Y] Indicates a Note in notes.dat meta.code char nullable pol_flux_3p5_cm_error RMS Uncertainty in Integrated Polarized Flux at 8.6GHz (mJy) mJy stat.error;phys.polarization.linear;phot.flux.density;em.radio.6-12GHz double nullable extent_flag Flag [EM] Indicates Extendedness meta.code char nullable pol_flux_1p5_cm_error RMS Uncertainty in Integrated Polarized Flux at 20GHz (mJy) mJy stat.error;phys.polarization.linear;phot.flux.density;em.radio.12-30GHz double nullable flux_6_cm_error RMS Uncertainty in Flux Density at 5 GHz (mJy) mJy stat.error;phot.flux.density;em.radio.3-6GHz double nullable wmap_source_number WMAP (Bennett et al., 2003 <J/ApJS/148/97>) Identification Number meta.id.assoc short nullable pol_flux_3p5_cm_limit Limit Flag for Integrated Polarized Flux at 8.6GHz meta.code;phys.polarization.linear;phot.flux.density;em.radio.6-12GHz char nullable optical_id_code Flag [GQ] Indicates Optical ID Code meta.code char nullable galactic_plane_flag Flag [G] Indicates Galactic Position meta.code char nullable flux_3p5_cm_error RMS Uncertainty in Flux Density at 8 GHz (mJy) mJy stat.error;phot.flux.density;em.radio.6-12GHz double nullable pol_flux_1p5_cm_limit Limit Flag for Integrated Polarized Flux at 20GHz meta.code;phys.polarization.linear;phot.flux.density;em.radio.12-30GHz char nullable pol_angle_6_cm Polarization Angle at 5 GHz degree phys.polarization.linear;em.radio.3-6GHz short nullable pol_percent_6_cm Fractional Polarization at 5 GHz percent phys.polarization.linear;em.radio.3-6GHz double nullable pol_flux_1p5_cm Integrated Polarized Flux at 20GHz (mJy) mJy phys.polarization.linear;phot.flux.density;em.radio.12-30GHz double nullable first_epoch_1p5_cm Flag [1-6] Indicates First Epoch of the 20-GHz Observations time.epoch char nullable pol_flux_6_cm_limit Limit Flag for Integrated Polarized Flux at 5GHz meta.code;phys.polarization.linear;phot.flux.density;em.radio.3-6GHz char nullable pol_percent_1p5_cm Fractional Polarization at 20 GHz percent phys.polarization.linear;em.radio.12-30GHz double nullable at20g_name IAU-Style Source Designation (AT20G JHHMMSS.S-DDMMSS) meta.id char nullable pol_angle_1p5_cm Polarization Angle at 20 GHz degree phys.polarization.linear;em.radio.12-30GHz short nullable flux_20_cm_error RMS Uncertainty in NVSS Flux Density at 1.4 GHz (mJy) mJy stat.error;phot.flux.density;em.radio.750-1500MHz 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