In addition, new techniques have been developed to use combinations of tracers or new tracers for direct measurements of BAO and RSD. These data have been used to advance models for the summed neutrino mass and inflation. The spectroscopic samples from BOSS and eBOSS allow for a diverse array of cosmology studies beyond the cosmic expansion history and growth of structure presented above. Imaging, Target Selection, and Spectroscopic Properties of Each Sampleĭu Mas des Bourboux et al. The table below may be cut off in your browser, so we also have a full-width version of the table. The background of these measurements for each of the SDSS cosmology samples can be found in the table below. The likelihoods, covariance matrices, and cosmoMC chains with the SDSS data can be found here. Key to the BAO and RSD measurements in SDSS, BOSS, and eBOSS are advanced processing of imaging data, carefully crafted target selection, well vetted catalogs of redshifts, weights, and randoms, clustering analysis, and assessment of statistical and systematic errors through mock catalogs. The BOSS design and survey strategy are described in the 2009-2014 BOSS overview while the eBOSS scientific justification and survey plan are described in the 2014-2019 eBOSS overview. With this redshift coverage and sensitivity, the SDSS experiment is unparalleled in its ability to explore models of cosmology.īoth BOSS and eBOSS used the upgraded 1000-fiber spectrographs that were installed at the 2.5 meter Sloan Telescope in 2009. The SDSS-I and -II, BOSS, and eBOSS spectroscopic surveys provide galaxy and quasar samples out to redshifts z 1, while the aggregate precision of the growth measurements is 4.78% over the redshift interval 0 < z < 1.5. A full video rendering of these data can be found in the 3D visualization appropriate for scientific presentations. Image credit: Anand Raichoor (EPFL), Ashley Ross (Ohio State University) and the SDSS Collaboration. Snapshot of the three-dimensional map of galaxies and quasars observed over four generations of SDSS spectroscopy.
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