VLASDF20CM ivo://nasa.heasarc/vlasdf20cm NASA/GSFC HEASARC Owen, Morrison 2026-07-17 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains some of the results from deep radio observations taken with the Very Large Array at a center frequency of 1400 MHz covering a region of the Spitzer Wide-area InfraRed Extragalactic (SWIRE) Survey of the Spitzer Legacy survey, centered at RA and Dec of 10:46:00, +59:01:00 (J2000). The reduction and cataloging of radio sources are described in the reference paper. This table comprises the catalog of the sources detected above 5 sigma. The survey presented is the deepest so far in terms of the radio source density on the sky. Perhaps surprisingly, the sources down to the bottom of the catalog appear to have median angular sizes which are still greater than 1 arcsecond, like their cousins 10-100 times stronger. The shape of the differential log N-log S counts also seems to require a correction for the finite sizes of the sources in order to be self-consistent. If the log N-log S normalization remains constant at the lowest flux densities, there are about six sources per square arcminute at 15 µJy (µJy) at 20 cm. Given the finite-source size this implies that we may reach the natural confusion limit near 1 uJy. The observations were made with the VLA in A, B, C, and D configurations for a total of almost 140 hr on-source between 2001 December and 2004 January. Since the total time is dominated by the A congiguration, the final image for analysis has a resolution of ~1.6 arcseconds. This table was created by the HEASARC in September 2010 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/AJ/136/1889/">CDS catalog J/AJ/136/1889/</a> file table2.dat. This is a service provided by NASA HEASARC . 2008AJ....136.1889O https://heasarc.gsfc.nasa.gov/W3Browse/all/vlasdf20cm.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=vlasdf20cm& GET text/xml 180 99999 true 161.606 58.67419444 0.0333333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=vlasdf20cm GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_vlasdf20cm&Action=More+Options&Action=Parameter+Search&ConeAdd=1 RADIO CATALOG 0.0333333333333333 Radio public vlasdf20cm VLA SWIRE Deep Field 20-cm Source 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 Observed Peak Brightness at 1400MHz mJy/beam phot.flux.density;em.radio.750-1500MHz double nullable int_flux_20_cm Total Flux Density at 1400 MHz mJy phot.flux.density;em.radio.750-1500MHz double nullable int_flux_20_cm_error Error in Total Flux Density at 1400 MHz mJy stat.error;phot.flux.density;em.radio.750-1500MHz double nullable major_axis_limit Limit Flag for Major Axis meta.code;phys.angSize.smajAxis char nullable major_axis Fitted Gaussian Major Axis FWHM arcsec phys.angSize.smajAxis double nullable minor_axis Fitted Gaussian Minor Axis FWHM arcsec phys.angSize.sminAxis double nullable dec_error Error in Declination (arcsec) arcsec stat.error;pos.eq.dec;meta.main double nullable source_number Sequential Identification Number for Each Source in Catalog meta.id;src int nullable position_angle Fitted Position Angle degree pos.posAng short nullable bii Galactic Latitude degree pos.galactic.lat double nullable ra_error Error in Right Ascension (s) s stat.error;pos.eq.ra;meta.main double nullable lii Galactic Longitude degree pos.galactic.lon double nullable snr_20_cm Peak Signal-to-Noise Ratio stat.snr;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