The Sixth Data Release of the Sloan Digital Sky Survey
Jennifer K. Adelman-McCarthy, et al. (for the SDSS Collaboration)

TL;DR
The Sixth Data Release of SDSS provides extensive imaging and spectroscopy data with improved calibration, covering millions of celestial objects and offering better stellar and galaxy parameter estimates for astronomical research.
Contribution
This release offers the most extensive stellar spectroscopy data to date, with enhanced calibration and more accurate stellar and galaxy parameters compared to previous SDSS data releases.
Findings
Increased number of stellar spectra with detailed parameters
Improved photometric and spectroscopic calibration accuracy
Fixes systematic errors in galaxy velocity dispersions
Abstract
With the Sixth Data Release of the Sloan Digital Sky Survey, the imaging of the Northern Galactic Cap is now complete. The survey contains images and parameters of roughly 287 million objects over 9583 deg^2, and 1.27 million spectra of stars, galaxies, quasars and blank sky (for sky subtraction) selected over 7425 deg^2. This release includes much more extensive stellar spectroscopy than previously, and also includes detailed estimates of stellar temperatures, gravities, and metallicities. The results of improved photometric calibration are now available, with uncertainties of roughly 1% in g, r, i, and z, and 2% in u, substantially better than the uncertainties in previous data releases. The spectra in this data release have improved wavelength and flux calibration, especially in the extreme blue and extreme red, leading to the qualitatively better determination of stellar types and…
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