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<b>High Energy-Astrophysics</b><br><i>Baryon Oscillation Spectroscopic Surveys (BOSS and BigBOSS)</i>

Monday, November 2, 2009
12:00 AM
335 West Hall

Speaker: David Schlegel (Lawrence Berkeley Lab)

The Baryon Oscillation Spectroscopic Survey (BOSS) is a Stage III dark energy experiment which began on the Sloan Telescope in September 2009. Schlegel will describe the current status of baryon acoustic oscillation (BAO) results as standard rulers for dark energy, and the design goals of the BOSS experiment. For the five years from 2009-2014, his team will map 1.5 million galaxies at z<0.7. A simultaneous survey of 160,000 QSOs will map the hydrogen gas in absorption at redshifts 2.3 < z < 3. BOSS will provide the definitive measurement of the low redshift (z<0.7) BAO scale, and it will pioneer a powerful new method of measuring BAO at high redshift. BigBOSS is a proposed Stage IV experiment that would extend this map to 50 million galaxies over 24,000 deg^2. Schlegel will describe this survey and its technical status.