Abstract
The baryon acoustic oscillations (BAO) imprinted a geometric spherical pattern in the distribution of cosmic structures, like quasars or galaxies. Such pattern can be detected by analyzing the 2-point correlation function of a large sample of cosmic objects, where it appears as a small excess of probability to find pairs of objects separated by a comoving distance: the radius of the sphere rs . This signature appears in a 3-dimensional (3D) scrutiny, but also in the 2-dimensional (2D) study, with the data located in a thin redshift bin. Differently from the 3D case, in 2D analysis, the angular BAO scale is not directly obtained from the 2-point angular correlation function due to the projection effect, which arises because the size of the redshift bin is not null, and therefore a small shift-correction is needed. Here we estimate the magnitude of such shift-correction for several redshift epochs of the Universe, in the linear and nonlinear approaches.
Published Version
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