Abstract : The Baryon Acoustic Oscillation (BAO) feature in the power spectrum of galaxies can be used as a standard ruler to probe the accelerated expansion of the Universe. The current surveys covering a comoving volume sufficient to unveil the BAO scale are limited to redshift $z \lesssim 0.6$.

We study several galaxy selection schemes aiming at building an emission-line-galaxy (ELG) sample in the redshift range $0.6<z<1.7$, that would be suitable for future BAO studies i.e. a highly biased galaxy sample.

We analyze six galaxy selections at the redshifts 0.3, 0.5, 0.7, 0.8, 1, 1.2 using the two observables, the angular galaxy clustering, and the weak lensing. We combine the angular clustering analysis with state of the art halo occupation distribution models to derive the properties of the haloes these galaxies inhabit, in particular the galaxy bias on large scales. Then a weak lensing analysis (aperture statistics) is performed to extract the galaxy bias and its stochasticity as a function of the scale.

We apply this analysis on a dataset composed of the photometry of the deep coadd on Stripe 82 (225 deg$^2$) made by SDSS and of WISE infrared photometric band W1. We use the photometric redshift of the CFHT-LS W4 T0006 and from SDSS. Both analysis on the selections at $z=0.3$ and 0.5 are consistent, and are in agreement with previous studies on these tracers, which shows our approach is valid. On the next redshift bins, the galaxy biases obtained using the weak lensing observable and the bias obtained by the clustering analysis are consistent. It shows the galaxy populations selected are strongly biased. Thus a survey using such tracers of the mass field will guarantee a high significance detection of the BAO. This gives a strong support for these galaxy selections to be observed by future large spectroscopic BAO surveys.