The BigBOSS QSO Pilot Survey

Details The BigBOSS QSO Pilot Survey The BigBOSS QSO Pilot Survey

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933512m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #335.12

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Future cosmological spectroscopic surveys of quasars will demand quasi-exhaustive target selection in both the "low-z” (redshifts of about 1.0 to 2.5) and the "mid-z” (redshifts of about 2.5 to 4.0) regimes. In combination, low-z and mid-z quasars can constrain the geometry of the Universe from the Baryon Acoustic Oscillation (BAO) feature in both quasar clustering and in the Lyman-alpha forest. But, target selection of quasars to the depths afforded by next-generation imaging surveys remains difficult, in particular because color-based selection of mid-z quasars_for which the optical colors of stars and quasars are similar_is highly inefficient. To help refine the selection of faint quasars for future surveys like BigBOSS, we have developed a method based on optical variability to target quasars up to g 23 and z 4, with a completeness better than 85%. Our method overcomes the drawbacks of color selection, which systematically misses quasars near 2.5 < z < 3.5. We have conducted a pilot survey within SDSS III/BOSS covering 16 square degrees, complemented by a 4 square degree survey on the MMT to study the fainter targets. We aim to determine the number density of quasars that BigBOSS will be able to use to constrain dark energy.
ADM acknowledges support from the Alexander von Humboldt Foundation.

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