Where to Start
News and Updates
Data Products
Data Access
Sky Coverage
Data Flow
Help and Feedback
Known Problems

Value-Added Catalogs

Back to Data Products
  • DR4 White Dwarf catalog as reported by Eisenstein et al., ApJ Supplement, in press (2006), A Catalog of Spectroscopically Confirmed White Dwarfs from the Sloan Digital Sky Survey Data Release 4 . The catalog contains 9316 spectroscopically confirmed white dwarfs and 928 hot subdwarfs.
  • Third edition of the SDSS Quasar Catalog As decribed in Schneider et al. 2005 (AJ, accepted, available at astro-ph/0503679), this catalog contains 46,420 quasars from DR3 that have i-band luminosities brighter than -22, at least one broad emission line, and highly reliable redshifts. The catalog is now available in ASCII and FITS binary table format. It supersedes the previous Second edition of the SDSS Quasar Catalog.
  • Composite red quasar spectra As described in Richards et al. (2003), Red and Reddened Quasars in the SDSS, AJ, in press, these spectra are composites as a function of relative g-i color, with input objects normalized such that both the absolute magnitude and redshift distributions are the same in like composites. We provide this tarball of composite red quasar spectra for download.
  • Composite broad-absorption line (BAL) quasar spectra as a function of BALQSO type from Reichard et al. 2003, A Catalog of Broad Absorption Line Quasars from the Sloan Digital Sky Survey Early Data Release, AJ, 125, 1711 (also astro-ph/0301019) and Reichard et al. 2003, Continuum and Emission-Line Properties of Broad Absorption Line Quasars, AJ, in press (astro-ph/0308508). We provide this tarball of composite BAL quasar spectra from the SDSS Early Data Relase; see the enclosed README file for more information.
  • SDSS Unusual BAL Quasars A sample of 23 unusual Broad Absorption Line Quasars has been assembled from both the SDSS EDR and some post-EDR data, totalling approximately 8000 quasar spectra. No further examples of the five categories of unusual BAL quasars discussed in the paper could be found among the data inspected, at least for spectra with SNR at least 6 per pixel in at least one of the g, r, or i bands (see section 4 of the paper). The paper also presents a revised balnicity index for deciding whether a quasar is a BAL quasar or not.

    Calibrated SDSS and followup spectra of all 23 objects, plus IRAF and SM code for calculating the traditional and revised balnicity indices, are available in a gzipped tar file.

    Questions regarding the BAL quasar work can be addressed to the lead author, Pat Hall (pathall@astro.princeton.edu), of Princeton University.

  • DR1 White Dwarf catalog as reported by Kleinman et al. 2004, ApJ 607, 426 A Catalog of Spectroscopically Identified White Dwarf Stars in the First Data Release of the Sloan Digital Sky Survey (also available at astro-ph/0402209).
  • The 3rd release of the SDSS Moving Object Catalog (MOC) lists astrometric and photometric data for 204,305 moving objects observed prior to June 2004. Of those, 67,637 are linked to 43,424 unique objects from the ASTORB file, and their orbital elements are also listed. This is a cumulative release, and it supersedes the previous versions (first MOC release and second MOC release).
  • SDSS Cut & Enhance galaxy cluster catalog The Sloan Digital Sky Survey CE galaxy cluster catalog (Goto et al. 2002, AJ 123, 1807) uses color cuts combined with a density enhancement algorithm to detect clusters of galaxies. The SDSS CE galaxy cluster catalog contains an estimated redshift and richness for each cluster found in 350 sq. deg. of SDSS commissioning data.
  • NYU Value-Added Galaxy Catalog The NYU Value-Added Galaxy Catalog (NYU-VAGC) is a cross-matched collection of galaxy catalogs, including the SDSS, maintained for the study of galaxy formation and evolution. It includes carefully constructed large-scale structure samples useful for calculating power spectra, etc, and includes, e.g., the "LSS Sample12" described in various Blanton et al. and Tegmark et al. SDSS papers. The SDSS data used have been reduced independently from the official SDSS reductions included in DR2/DR3, especially in photometric calibration, but the differences are minor. There is also a page describing the results of Blanton et al.'s determination of the SDSS galaxy luminosity function.
  • The CMU-PITT SDSS Value Added Catalog (VAC) database is a database which allows users to conduct scientific analyses on the SDSS spectroscopic galaxy data. It allows for easy use of spectral information (i.e. emission line-widths), and for anybody to upload Science Derivatives for SDSS galaxies.
  • The MPA/JHU value-added galaxy catalog contains results from a custom galaxy spectral fitting code (line fluxes, continuum indices (raw, emission line subtracted, from best-fit model and interpolated to remove effects from sky lines), line widths, EWs etc.) mostly written by Christy Tremonti and described in Tremonti et al (2004). In addition, the following types of derived data are also available: Finally, the MPA/JHU group has correlated the SDSS to the HST Exposure Time Catalogues and provide files for matching to the above spectroscopic data as well as the DR4 imaging.
  • The SDSS Orion data release contains imaging near the Galactic plane outside of the nominal survey boundaries. These additional data were obtained during commissioning and subsequent testing of the SDSS observing system, and they provide unique wide-area imaging data in regions of high obscuration and star formation, including numerous young stellar objects, Herbig-Haro objects and young star clusters. Because these data are outside the Survey regions in the Galactic caps, they are not part of the standard SDSS data releases. This public release of about 470 square degrees includes the star-forming region NGC 2068/NGC 2071/HH24 and a large part of Barnard's loop.
  • The Princeton spectra are an alternate reduction of the DR1 spectra. The 2d reductions are essentially identical, but the determination of redshifts and classifications uses an independent code doing direct chi-squared fitting of templates to spectra.
  • The SuperCOSMOS Science Archive holds the object catalog data extracted from scans of photographic Schmidt survey plates of the southern sky. The SSA catalog includes links to cross-identifications from the SDSS EDR and DR1, USNO-B and 2MASS final data release catalogs.

Last modified: Wed May 18 18:13:26 CDT 2005