The 2-degree Field Lensing Survey: design and clustering measurements
  We present the 2-degree Field Lensing Survey (2dFLenS), a new galaxy redshift
survey performed at the Anglo-Australian Telescope. 2dFLenS is the first
wide-area spectroscopic survey specifically targeting the area mapped by
deep-imaging gravitational lensing fields, in this case the Kilo-Degree Survey.
2dFLenS obtained 70,079 redshifts in the range z < 0.9 over an area of 731 sq
deg, and is designed to extend the datasets available for testing gravitational
physics and promote the development of relevant algorithms for joint imaging
and spectroscopic analysis. The redshift sample consists first of 40,531
Luminous Red Galaxies (LRGs), which enable analyses of galaxy-galaxy lensing,
redshift-space distortion, and the overlapping source redshift distribution by
cross-correlation. An additional 28,269 redshifts form a magnitude-limited (r <
19.5) nearly-complete sub-sample, allowing direct source classification and
photometric-redshift calibration. In this paper, we describe the motivation,
target selection, spectroscopic observations, and clustering analysis of
2dFLenS. We use power spectrum multipole measurements to fit the redshift-space
distortion parameter of the LRG sample in two redshift ranges 0.15 < z < 0.43
and 0.43 < z < 0.7 as beta = 0.49 +/- 0.15 and beta = 0.26 +/- 0.09,
respectively. These values are consistent with those obtained from LRGs in the
Baryon Oscillation Spectroscopic Survey. 2dFLenS data products will be released
via our website http://2dflens.swin.edu.au.
