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The SDSS-IV Extended Baryon Oscillation Spectroscopic Survey: Overview and Early Data

Citation:

Dawson KS, Kneib J-P, Percival WJ, Alam S, Albareti FD, Anderson SF, Armengaud E, Aubourg É, Bailey S, Bautista JE, et al. The SDSS-IV Extended Baryon Oscillation Spectroscopic Survey: Overview and Early Data. The Astronomical Journal. 2016;151.

Date Published:

February 1, 2016

Abstract:

In a six-year program started in 2014 July, the Extended BaryonOscillation Spectroscopic Survey (eBOSS) will conduct novel cosmologicalobservations using the BOSS spectrograph at Apache Point Observatory.These observations will be conducted simultaneously with the Time DomainSpectroscopic Survey (TDSS) designed for variability studies and theSpectroscopic Identification of eROSITA Sources (SPIDERS) programdesigned for studies of X-ray sources. In particular, eBOSS will measurewith percent-level precision the distance-redshift relation with baryonacoustic oscillations (BAO) in the clustering of matter. eBOSS will usefour different tracers of the underlying matter density field to vastlyexpand the volume covered by BOSS and map the large-scale-structuresover the relatively unconstrained redshift range 0.6 < z < 2.2.Using more than 250,000 new, spectroscopically confirmed luminous redgalaxies at a median redshift z = 0.72, we project that eBOSS will yieldmeasurements of the angular diameter distance dA(z) to an

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