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Published June 2009 | Published
Journal Article Open

The Seventh Data Release of the Sloan Digital Sky Survey

Abazajian, Kevork N. ORCID icon
Adelman-McCarthy, Jennifer K.
Agüeros, Marcel A. ORCID icon
Allam, Sahar S.
Allende Prieto, Carlos ORCID icon
An, Deokkeun
Anderson, Kurt S. J.
Anderson, Scott F.
Annis, James
Bahcall, Neta A.
Bailer-Jones, C. A. L.
Barentine, J. C.
Bassett, Bruce A.
Becker, Andrew C.
Beers, Timothy C. ORCID icon
Bell, Eric F.
Belokurov, Vasily ORCID icon
Berlind, Andreas A.
Berman, Eileen F.
Bernardi, Mariangela
Bickerton, Steven J.
Bizyaev, Dmitry
Blakeslee, John P.
Blanton, Michael R.
Bochanski, John J.
Boroski, William N.
Brewington, Howard J.
Brinchmann, Jarle
Brinkmann, J.
Brunner, Robert J.
Budavári, Tamás
Carey, Larry N.
Carliles, Samuel
Carr, Michael A.
Castander, Francisco J. ORCID icon
Cinabro, David
Connolly, A. J.
Csabai, István
Cunha, Carlos E.
Czarapata, Paul C.
Davenport, James R. A. ORCID icon
de Haas, Ernst
Dilday, Ben
Doi, Mamoru
Eisenstein, Daniel J.
Evans, Michael L.
Evans, N. W.
Fan, Xiaohui ORCID icon
Friedman, Scott D.
Frieman, Joshua A.
Fukugita, Masataka
Gänsicke, Boris T. ORCID icon
Gates, Evalyn ORCID icon
Gillespie, Bruce
Gilmore, G.
Gonzalez, Belinda
Gonzalez, Carlos F.
Grebel, Eva K. ORCID icon
Gunn, James E.
Györy, Zsuzsanna
Hall, Patrick B.
Harding, Paul
Harris, Frederick H.
Harvanek, Michael
Hawley, Suzanne L. ORCID icon
Hayes, Jeffrey J. E.
Heckman, Timothy M.
Hendry, John S.
Hennessy, Gregory S.
Hindsley, Robert B.
Hoblitt, J.
Hogan, Craig J.
Hogg, David W. ORCID icon
Holtzman, Jon A.
Hyde, Joseph B.
Ichikawa, Shin-ichi
Ichikawa, Takashi
Im, Myungshin ORCID icon
Ivezí, Željko
Jester, Sebastian
Jiang, Linhua ORCID icon
Johnson, Jennifer A. ORCID icon
Jorgensen, Anders M.
Jurić, Mario ORCID icon
Kent, Stephen M.
Kessler, R. ORCID icon
Kleinman, S. J.
Knapp, G. R. ORCID icon
Konishi, Kohki
Kron, Richard G.
Krzesinski, Jurek
Kuropatkin, Nikolay
Lampeitl, Hubert
Lebedeva, Svetlana
Gyoon Lee, Myung
Sun Lee, Young
Leger, R. French
Lépine, Sébastien ORCID icon
Li, Nolan
Lima, Marcos
Lin, Huan
Long, Daniel C.
Loomis, Craig P.
Loveday, Jon
Lupton, Robert H. ORCID icon
Magnier, Eugene ORCID icon
Malanushenko, Olena
Malanushenko, Viktor
Mandelbaum, Rachel ORCID icon
Margon, Bruce ORCID icon
Marriner, John P.
Martínez-Delgado, David ORCID icon
Matsubara, Takahiko
McGehee, Peregrine M. ORCID icon
McKay, Timothy A.
Meiksin, Avery
Morrison, Heather L.
Mullally, Fergal
Munn, Jeffrey A. ORCID icon
Murphy, Tara ORCID icon
Nash, Thomas
Nebot, Ada
Neilsen, Eric H., Jr.
Newberg, Heidi Jo
Newman, Peter R.
Nichol, Robert C.
Nicinski, Tom
Nieto-Santisteban, Maria
Nitta, Atsuko
Okamura, Sadanori
Oravetz, Daniel J.
Ostriker, Jeremiah P.
Owen, Russell
Padmanabhan, Nikhil
Pan, Kaike
Park, Changbom
Pauls, George
Peoples, John, Jr.
Percival, Will J.
Pier, Jeffrey R.
Pope, Adrian C.
Pourbaix, Dimitri
Price, Paul A.
Purger, Norbert
Quinn, Thomas
Raddick, M. Jordan
Fiorentin, Paola R.
Richards, Gordon T.
Richmond, Michael
Riess, Adam G.
Rix, Hans-Walter ORCID icon
Rockosi, Constance M.
Sako, Masao
Schlegel, David J. ORCID icon
Schneider, Donald P.
Scholz, Ralf-Dieter
Schreiber, Matthias-R
Schwope, Axel D.
Seljak, Uroš
Sesar, Branimir ORCID icon
Sheldon, Erin
Shimasaku, Kazu
Sibley, Valena C.
Simmons, A. E.
Sivarani, Thirupathi
Smith, J. Allyn
Smith, Martin C.
Smolčić, Vernesa ORCID icon
Snedden, Stephanie A.
Stebbins, Albert
Steinmetz, Matthias
Stoughton, Christopher
Strauss, Michael A. ORCID icon
SubbaRao, Mark
Suto, Yasushi
Szalay, Alexander S.
Szapudi, István
Szkody, Paula
Tanaka, Masayuki ORCID icon
Tegmark, Max
Teodoro, Luis F. A.
Thakar, Aniruddha R.
Tremonti, Christy A.
Tucker, Douglas L.
Uomoto, Alan
Vanden Berk, Daniel E.
Vandenberg, Jan
Vidrih, S.
Vogeley, Michael S.
Voges, Wolfgang
Vogt, Nicole P.
Wadadekar, Yogesh
Watters, Shannon
Weinberg, David H.
West, Andrew A.
White, Simon D. M.
Wilhite, Brian C.
Wonders, Alainna C.
Yanny, Brian ORCID icon
Yocum, D. R.
York, Donald G.
Zehavi, Idit
Zibetti, Stefano
Zucker, Daniel B.


This paper describes the Seventh Data Release of the Sloan Digital Sky Survey (SDSS), marking the completion of the original goals of the SDSS and the end of the phase known as SDSS-II. It includes 11,663 deg^2 of imaging data, with most of the ~2000 deg^2 increment over the previous data release lying in regions of low Galactic latitude. The catalog contains five-band photometry for 357 million distinct objects. The survey also includes repeat photometry on a 120° long, 2°.5 wide stripe along the celestial equator in the Southern Galactic Cap, with some regions covered by as many as 90 individual imaging runs. We include a co-addition of the best of these data, going roughly 2 mag fainter than the main survey over 250 deg^2. The survey has completed spectroscopy over 9380 deg^2; the spectroscopy is now complete over a large contiguous area of the Northern Galactic Cap, closing the gap that was present in previous data releases. There are over 1.6 million spectra in total, including 930,000 galaxies, 120,000 quasars, and 460,000 stars. The data release includes improved stellar photometry at low Galactic latitude. The astrometry has all been recalibrated with the second version of the USNO CCD Astrograph Catalog, reducing the rms statistical errors at the bright end to 45 milliarcseconds per coordinate. We further quantify a systematic error in bright galaxy photometry due to poor sky determination; this problem is less severe than previously reported for the majority of galaxies. Finally, we describe a series of improvements to the spectroscopic reductions, including better flat fielding and improved wavelength calibration at the blue end, better processing of objects with extremely strong narrow emission lines, and an improved determination of stellar metallicities.

Additional Information

© 2009. The American Astronomical Society. Received 2008 December 2; accepted 2009 March 19; published 2009 May 18. This paper represents the end of SDSS-II, the culmination of a project taking two decades and involving an enormous number of scientists from all over the world. We dedicate this paper to colleagues whomade essential contributions to the SDSS but are no longer with us: John N. Bahcall, Don Baldwin, Norm Cole, Arthur Davidsen, Jim Gray, Bohdan Paczyński, and David N. Schramm. The successful completion of this project is in large part a reflection of the hard work and intellectual capital they put into it. Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the U.S. Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society, and the Higher Education Funding Council for England. The SDSS Web Site is http://www.sdss.org/. The SDSS is managed by the Astrophysical Research Consortium for the Participating Institutions. The participating institutions are the American Museum of Natural History, Astrophysical Institute Potsdam, University of Basel, University of Cambridge, Case Western Reserve University, University of Chicago, Drexel University, Fermilab, the Institute for Advanced Study, the Japan Participation Group, Johns Hopkins University, the Joint Institute for Nuclear Astrophysics, the Kavli Institute for Particle Astrophysics and Cosmology, the Korean Scientist Group, the Chinese Academy of Sciences (LAMOST), Los Alamos National Laboratory, theMax-Planck- Institute for Astronomy (MPIA), the Max-Planck-Institute for Astrophysics (MPA), New Mexico State University, Ohio State University, University of Pittsburgh, University of Portsmouth, Princeton University, the United States Naval Observatory, and the University of Washington.

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