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Bibliographical reference
The Astrophysical Journal Supplement, Volume 203, Issue 2, article id. 21, 13 pp. (2012).
Description
The Sloan Digital Sky Survey III (SDSS-III) presents the first
spectroscopic data from the Baryon Oscillation Spectroscopic Survey
(BOSS). This ninth data release (DR9) of the SDSS project includes
535,995 new galaxy spectra (median z ~ 0.52), 102,100 new quasar spectra
(median z ~ 2.32), and 90,897 new stellar spectra, along with the data
presented in previous data releases. These spectra were obtained with
the new BOSS spectrograph and were taken between 2009 December and 2011
July. In addition, the stellar parameters pipeline, which determines
radial velocities, surface temperatures, surface gravities, and
metallicities of stars, has been updated and refined with improvements
in temperature estimates for stars with T eff < 5000 K and
in metallicity estimates for stars with [Fe/H] > -0.5. DR9 includes
new stellar parameters for all stars presented in DR8, including stars
from SDSS-I and II, as well as those observed as part of the SEGUE-2.
The astrometry error introduced in the DR8 imaging catalogs has been
corrected in the DR9 data products. The next data release for SDSS-III
will be in Summer 2013, which will present the first data from the
APOGEE along with another year of data from BOSS, followed by the final
SDSS-III data release in 2014 December.
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