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Centro de Astrofísica da Universidade do Porto

SEGUE: A Spectroscopic Survey of 240,000 Stars With g = 14-20

B. Yanny, C. M. Rockosi, H. J. Newberg, G. R. Knapp, J. K. Adelman-McCarthy, B. Alcorn, S. S. Allam, C. A. Prieto, D. An, K. S. J. Anderson, S. F. Anderson, C. A. L. Bailer-Jones, S. Bastian, T. C. Beers, E. F. Bell, V. Belokurov, N. Blythe, J. J. Bochanski, W. N. Boroski, J. Brinchmann, J. Brinkmann, H. J. Brewington, L. N. Carey, K. M. Cudworth, M. L. Evans, N. W. Evans, E. Gates, B. T. Gänsicke, B. Gillespie, G. Gilmore, A. N. Gomez-Moran, E. K. Grebel, J. Greenwell, J. E. Gunn, C. Jordan, W. Jordan, P. Harding, H. Harris, J. S. Hendry, D. Holder, I. I. Ivans, Z. Ivezic, S. Jester, J. A. Johnson, S. M. Kent, S. J. Kleinman, A. Y. Kniazev, J. Krzesiński, R. G. Kron, N. Kuropatkin, S. Lebedeva, Y. Lee, R. F. Leger, S. Lépine, S. Levine, H. Lin, D. C. Long, C. P. Loomis, R. H. Lupton, O. Malanushenko, V. Malanushenko, B. Margon, D. Martinez-Delgado, P. M. McGehee, D. Monet, H. L. Morrison, J. A. Munn, Eric H. Neilsen, A. Nitta, J. E. Norris, D. Oravetz, R. Owen, N. Padmanabhan, K. Pan, R. S. Peterson, J. R. Pier, J. Platson, P. R. Fiorentin, G. T. Richards, H.-W. Rix, D. J. Schlegel, D. P. Schneider, M. R. Schreiber, A. D. Schwope, V. Sibley, A. Simmons, S. A. Snedden, J. A. Smith, L. Stark, F. Stauffer, M. Steinmetz, C. Stoughton, M. SubbaRao, A. S. Szalay, P. Szkody, A. R. Thakar, S. Thirupathi, D. L. Tucker, A. Uomoto, D. E. V. Berk, S. Vidrih, Y. Wadadekar, S. Watters, R. Wilhelm, R. F. G. Wyse, J. Yarger, D. B. Zucker

The Sloan Extension for Galactic Understanding and Exploration (SEGUE) Survey obtained ≈240,000 moderate resolution (R ∼ 1800) spectra from 3900 Å to 9000 Å of fainter Milky Way stars (14.0 < g < 20.3) of a wide variety of spectral types, both main-sequence and evolved objects, with the goal of studying the kinematics and populations of our Galaxy and its halo. The spectra are clustered in 212 regions spaced over three quarters of the sky. Radial velocity accuracies for stars are σ(RV) ∼ 4 km s−1 at g < 18, degrading to σ(RV) ∼ 15 km s−1 at g ∼ 20. For stars with signal-to-noise ratio >10 per resolution element, stellar atmospheric parameters are estimated, including metallicity, surface gravity, and effective temperature. SEGUE obtained 3500 deg2 of additional ugriz imaging (primarily at low Galactic latitudes) providing precise multicolor photometry (σ(g, r, i) ∼ 2%), (σ(u, z) ∼ 3%) and astrometry (≈0''.1) for spectroscopic target selection. The stellar spectra, imaging data, and derived parameter catalogs for this survey are publicly available as part of Sloan Digital Sky Survey Data Release 7.

Astrophysics - Galaxy Astrophysics

The Astronomical Journal
Volume 137, Page 4377
May 2009

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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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