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Centro de Astrofísica da Universidade do Porto

The Fourth Data Release of the Sloan Digital Sky Survey

J. K. Adelman-McCarthy, M. A. Agüeros, S. S. Allam, K. S. J. Anderson, S. F. Anderson, J. Annis, N. A. Bahcall, I. K. Baldry, J. C. Barentine, A. Berlind, M. Bernardi, M. R. Blanton, W. N. Boroski, H. J. Brewington, J. Brinchmann, J. Brinkmann, R. J. Brunner, T. Budavári, L. N. Carey, M. A. Carr, F. J. Castander, A. J. Connolly, I. Csabai, P. C. Czarapata, J. J. Dalcanton, M. Doi, F. Dong, D. J. Eisenstein, M. L. Evans, X. Fan, D. P. Finkbeiner, S. D. Friedman, J. A. Frieman, M. Fukugita, B. Gillespie, K. Glazebrook, J. Gray, E. K. Grebel, J. E. Gunn, V. K. Gurbani, E. de Haas, P. B. Hall, F. H. Harris, M. Harvanek, S. L. Hawley, J. Hayes, J. S. Hendry, G. S. Hennessy, R. B. Hindsley, C. M. Hirata, C. J. Hogan, D. W. Hogg, D. J. Holmgren, J. A. Holtzman, Shin-ichi Ichikawa, ´. Ivezić, S. Jester, D. E. Johnston, A. M. Jorgensen, M. Jurić, S. M. Kent, S. J. Kleinman, G. R. Knapp, A. Y. Kniazev, R. G. Kron, J. Krzesiński, N. Kuropatkin, D. Q. Lamb, H. Lampeitl, B. C. Lee, R. F. Leger, H. Lin, D. C. Long, J Loveday, R. H. Lupton, B. Margon, D. Martínez-Delgado, R. Mandelbaum, T. Matsubara, P. M. McGehee, Timothy A. McKay, A. Meiksin, J. A. Munn, R. Nakajima, T. Nash, Eric H. Neilsen, H. J. Newberg, P. R. Newman, R. C. Nichol, T. Nicinski, M. Nieto-Santisteban, A. Nitta, W. O'Mullane, S. Okamura, R. Owen, N. Padmanabhan, G. Pauls, John Peoples, J. R. Pier, A. C. Pope, D. Pourbaix, T. R. Quinn, G. T. Richards, M. W. Richmond, C. M. Rockosi, D. J. Schlegel, D. P. Schneider, J. Schroeder, R. Scranton, U. Seljak, E. Sheldon, K. Shimasaku, J. A. Smith, V. Smolčić, S. A. Snedden, C. Stoughton, M. A. Strauss, M. SubbaRao, A. S. Szalay, I. Szapudi, P. Szkody, M. Tegmark, A. R. Thakar, D. L. Tucker, A. Uomoto, D. E. Vanden Berk, J. Vandenberg, M. S. Vogeley, W. Voges, N. P. Vogt, L. M. Walkowicz, D. H. Weinberg, A. A. West, S. D. M. White, Y. Xu, B. Yanny, D. R. Yocum, D. G. York, I. Zehavi, S. Zibetti, D. B. Zucker

Abstract
This paper describes the Fourth Data Release of the Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through 2004 June. The data release includes five-band photometric data for 180 million objects selected over 6670 deg2 and 673,280 spectra of galaxies, quasars, and stars selected from 4783 deg2 of those imaging data using the standard SDSS target selection algorithms. These numbers represent a roughly 27% increment over those of the Third Data Release; all the data from previous data releases are included in the present 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.

The Astrophysical Journal Supplement Series
Volume 162, Page 38
January 2006

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Institute of Astrophysics and Space Sciences

Institute of Astrophysics and Space Sciences (IA) is a new but long anticipated research infrastructure with a national dimension. It embodies a bold but feasible vision for the development of Astronomy, Astrophysics and Space Sciences in Portugal, taking full advantage and fully realizing the potential created by the national membership of the European Space Agency (ESA) and the European Southern Observatory (ESO). IA resulted from the merging the two most prominent research units in the field in Portugal: the Centre for Astrophysics of the University of Porto (CAUP) and the Center for Astronomy and Astrophysics of the University of Lisbon (CAAUL). It currently hosts more than two-thirds of all active researchers working in Space Sciences in Portugal, and is responsible for an even greater fraction of the national productivity in international ISI journals in the area of Space Sciences. This is the scientific area with the highest relative impact factor (1.65 times above the international average) and the field with the highest average number of citations per article for Portugal.

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