Galaxy clustering with the Dark Energy Survey Year 3 data

The Dark Energy Survey is an international collaboration whose main goal is to unveil the nature of dark energy. For this purpose, it has performed a 6-year photometric survey from the Blanco Telescope at Cerro Tololo (Chile), covering nearly 5000 deg² of the southern sky with the filters g, r, i, z and Y and reaching magnitudes up to i = 23.7 and redshifts of about 1.2. One of DES's most powerful probes to constrain cosmological parameters is the angular galaxy clustering, described by the two point angular correlation function, w(θ), especially when combined with weak lensing measurements. As part of the measurement, we must take special care of any spurious signal introduced by spatially varying observing conditions and survey properties, such as exposure time and seeing, or astrophysical sources of contamination, like galactic extinction or stellar density. In order to get rid of this impact, Survey Property maps are created and an iterative process is applied to the data together with these maps. The aim of this contribution is to introduce this systematic decontamination procedure focusing on the analysis of the first three years of data, and to showcase the measurement of w(θ) in two different galaxy clustering samples, redMaGiC and MagLim, and its validation in their corresponding simulations. New, preliminary results from clustering for Year 3 data will be shown.