The Fourth Data Release of the Sloan Digital Sky Survey

By J. Adelman-McCarthy, M. Agüeros, Sahar Allam, K. S. Anderson, S. Anderson, James Annis, N. Bahcall, I. Baldry, John C. Barentine, A. Berlind and 130 more. Astrophysical Journal Supplement Series, 2005

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This paper describes the fourth data release of the Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through June 2004. The data release includes ﬁve-band photometric data for 180 million objects selected over 6670 deg 2 , and 673,280 spectra of galaxies, quasars, and stars selected from 4783 deg 2 of that imaging data using the standard SDSS target selection algorithms. These numbers represent a roughly 25% increment over those of the Third Data Release. The Fourth Data Release also includes an additional 131,840 spectra of objects selected using a variety of alternative algorithms, to address scientiﬁc issues ranging from the kinematics of stars in the Milky Way thick disk to populations of faint galaxies and quasars.

Subfields: Astronomy and Astrophysics, Ecology

View Paper: https://www.semanticscholar.org/paper/b674baca40666f0d4cb9566a244a0496739e99d4

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