VLASS821P4 ivo://nasa.heasarc/vlass821p4 NASA/GSFC HEASARC Hodge et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains results from a high-resolution radio survey of the Sloan Digital Sky Survey (SDSS) Southern Equatorial Stripe, also known as Stripe 82. This 1.4-GHz survey was conducted with the Very Large Array (VLA) primarily in the A configuration, with supplemental B configuration data to increase sensitivity to extended structure. The survey has an angular resolution of 1.8 arcseconds and achieves a median rms noise of 52 µJy/beam (µJy/beam) over 92 deg<sup>2</sup>. This is the deepest 1.4-GHz survey to achieve this large of an area, filling a gap in the phase space between small, deep and large, shallow surveys. It also serves as a pilot project for a larger high-resolution survey with the Expanded Very Large Array (EVLA). The authors discuss the technical design of the survey and details of the observations, and outline their method for data reduction, in the reference paper. They present a catalog of 17,969 isolated radio components, for an overall source density of ~195 sources deg<sup>-2</sup>. The astrometric accuracy of the data is excellent, with an internal check utilizing multiply observed sources yielding an rms scatter of 0.19 arcseconds in both Right Ascension and Declination. A comparison to the SDSS DR7 Quasar Catalog further confirms that the astrometry is well-tied to the optical reference frame, with mean offsets of 0.02" +/- 0.01" in Right Ascension, and 0.01" +/- 0.02" in Declination. A check of their photometry reveals a small, negative CLEAN-like bias on the level of 35 uJy. The authors report on the catalog completeness, finding that 97% of FIRST-detected quasars are recovered in the new Stripe 82 radio catalog, while faint, extended sources are more likely to be resolved out by the resolution bias. In their paper, they conclude with a discussion of the optical counterparts to the catalog sources, including 76 newly detected radio quasars. The full catalog as well as a search page and cutout server are available online at <a href="http://third.ucllnl.org/cgi-bin/stripe82cutout">http://third.ucllnl.org/cgi-bin/stripe82cutout</a>. The SDSS Stripe 82 observations were made with the National Radio Astronomy Observatory's (NRAO's) VLA. The data were collected over two VLA cycles, 2007-2008 and 2008-2009. The majority of the observations were taken in the A configuration, but the authors also obtained B-configuration coverage of the area in order to improve the sampling of the Fourier (U-V) plane and to increase sensitivity to the extended structure. Area 1 (delineated in black in Figure 1(a) of the paper) was covered in the A and B configurations in 2007-2008, and Area 2 (delineated in purple in Figure 1(a) of the paper) in the A and B configurations in 2008-2009. Area 1 is made up of 275 pointings, and Area 2 has 374, coming to 649 fields, and 92 deg<sup>2</sup> covered in total. This table was created by the HEASARC in August 2013 based on a complete machine-readable version of Table 1 from the reference paper which was kindly provided by the first author. This is a service provided by NASA HEASARC . 2011AJ....142....3H https://heasarc.gsfc.nasa.gov/W3Browse/all/vlass821p4.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=vlass821p4& GET text/xml 180 99999 true 15.40930833 -1.39151111 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=vlass821p4 GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_vlass821p4&Action=More+Options&Action=Parameter+Search&ConeAdd=1 RADIO CATALOG 0.0166666666666667 Radio public vlass821p4 VLA SDSS Stripe 82 Survey 1.4-GHz Source Catalog source_number Sequential Identification Number for Each Source in Catalog meta.id;src int nullable 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_1p4_ghz Peak Flux Density mJy/beam phot.flux.density;em.radio.750-1500MHz double nullable int_flux_1p4_ghz Integrated Flux Density mJy phot.flux.density;em.radio.750-1500MHz double nullable flux_1p4_ghz_error Local Noise Estimate at Source Position mJy/beam stat.error;phot.flux.density;em.radio.750-1500MHz double nullable major_axis Deconvolved Gaussian Major Axis FWHM arcsec phys.angSize.smajAxis double nullable minor_axis Deconvolved Gaussian Minor Axis FWHM arcsec phys.angSize.sminAxis double nullable position_angle Deconvolved Gaussian Position Angle degree pos.posAng double nullable num_sdss_matches Number of SDSS Optical Counterparts within 8-arcsec Radius meta.number short nullable imag i Magnitude of Closest SDSS Counterpart mag phot.mag;em.opt.I double nullable bii Galactic Latitude degree pos.galactic.lat double nullable fit_major_axis Fitted Gaussian Major Axis FWHM arcsec phys.angSize.smajAxis double nullable lii Galactic Longitude degree pos.galactic.lon double nullable fit_position_angle Fitted Gaussian Position Angle degree pos.posAng double nullable sdss_morph_class Flag [sg-] Indicates SDSS Morphological Class src.class char nullable prob_no_source Probability the Source Is Spurious double nullable field_name Designation of Co-Added Image with Source meta.id;obs.field char nullable fit_minor_axis Fitted Gaussian Minor Axis FWHM arcsec phys.angSize.smajAxis double nullable min_vla_sdss_offset Offset of Closest SDSS Counterpart arcsec pos.angDistance;em.radio.750-1500MHz;em.opt 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