THE SEVENTH DATA RELEASE OF THE SLOAN DIGITAL SKY SURVEY
Kevork N. Abazajian, Jennifer Adelman-McCarthy, Marcel A. Agüeros, S. Allam, Carlos Allende Prieto, Deokkeun An, Kurt S. J. Anderson, Scott F. Anderson, James Annis, Neta A. Bahcall, C. A. L. Bailer‐Jones, John C. Barentine, Bruce A. Bassett, Andrew C. Becker, Timothy C. Beers, Eric F. Bell, Vasily A Belokurov, Andreas A. Berlind, Eileen Berman, Mariangela Bernardi, Steven J. Bickerton, Dmitry Bizyaev, John P. Blakeslee, Michael R. Blanton, John J. Bochanski, William N. Boroski, H. Brewington, J. Brinchmann, Jon Brinkmann, Robert J. Brunner, Tamás Budavári, Larry N. Carey, Samuel Carliles, Michael A. Carr, Francisco Javier Castander, David Cinabro, Andrew J. Connolly, István Csabai, Carlos E. Cunha, Paul C. Czarapata, James R. A. Davenport, Ernst de Haas, B. Dilday, Mamoru Doi, Daniel J. Eisenstein, N. W. Evans, Xiaohui Fan, S. D. Friedman, Joshua A. Frieman, M. Fukugita, Boris T. Gänsicke, Evalyn I. Gates, Bruce Gillespie, Gerard F. Gilmore, Carlos Fernández Gonzalez, Eva K. Grebel, James E. Gunn, Zsuzsanna Györy, Patrick B. Hall, Paul Harding, Frederick H. Harris, Michael Harvanek, Suzanne L. Hawley, Jeffrey J. E. Hayes, Timothy M. Heckman, John S. Hendry, Gregory S. Hennessy, Robert B. Hindsley, Joshua Hoblitt, Craig J. Hogan, David W. Hogg, Jon A. Holtzman, Shin-ichi Ichikawa, Takashi Ichikawa, Myungshin Im, Željko Ivezić, Sebastian Jester, Linhua Jiang, Jennifer A. Johnson, A. M. Jorgensen, Mario Jurić, S. Kent, R. Keßler, S. J. Kleinman, Gillian R. Knapp, K. Konishi, Richard G. Kron, J. Krzesiński, N. Kuropatkin, Hubert Lampeitl, Svetlana Lebedeva, Myung Gyoon Lee, Young Sun Lee, R. French Leger, Sébastien Lépine, Nolan Li, M. Lima
The Astrophysical Journal Supplement Series · 2009 · 5,370 citationsOpen access
Abstract
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.
Cite this paper
Abazajian, K. N., Adelman-McCarthy, J., Agüeros, M. A., Allam, S., Prieto, C. A., An, D., Anderson, K. S. J., Anderson, S. F., Annis, J., Bahcall, N. A., Bailer‐Jones, C. A. L., Barentine, J. C., Bassett, B. A., Becker, A. C., Beers, T. C., Bell, E. F., Belokurov, V. A., Berlind, A. A., Berman, E., … Lima, M. (2009). THE SEVENTH DATA RELEASE OF THE SLOAN DIGITAL SKY SURVEY. The Astrophysical Journal Supplement Series, 182(2), 543–558. https://doi.org/10.1088/0067-0049/182/2/543
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