@Article{Arnalte-Mur_etal2012,
author="Arnalte-Mur, P.
and Labatie, A.
and Clerc, N.
and Martinez, V. J.
and Starck, J. L.
and Lachieze-Rey, M.
and Saar, E.
and Paredes, S.",
title="Wavelet analysis of baryon acoustic structures in the galaxy distribution",
journal="Astronomy {\&} Astrophysics",
year="2012",
publisher="Edp Sciences S A",
volume="542",
pages="A34 - 11pp",
optkeywords="large-scale structure of Universe; distance scale; galaxies: cluster: general; methods: data analysis; methods: statistical",
abstract="Context. Baryon acoustic oscillations (BAO) are imprinted in the density field by acoustic waves travelling in the plasma of the early universe. Their fixed scale can be used as a standard ruler to study the geometry of the universe. Aims. The BAO have been previously detected using correlation functions and power spectra of the galaxy distribution. We present a new method to detect the real-space structures associated with BAO. These baryon acoustic structures are spherical shells of relatively small density contrast, surrounding high density central regions. Methods. We design a specific wavelet adapted to search for shells, and exploit the physics of the process by making use of two different mass tracers, introducing a specific statistic to detect the BAO features. We show the effect of the BAO signal in this new statistic when applied to the Lambda -- cold dark matter (Lambda CDM) model, using an analytical approximation to the transfer function. We confirm the reliability and stability of our method by using cosmological N-body simulations from the MareNostrum Institut de Ciencies de l{\textquoteright}Espai (MICE). Results. We apply our method to the detection of BAO in a galaxy sample drawn from the Sloan Digital Sky Survey (SDSS). We use the {\textquoteleft}{\textquoteleft}main{\textquoteright}{\textquoteright} catalogue to trace the shells, and the luminous red galaxies (LRG) as tracers of the high density central regions. Using this new method, we detect, with a high significance, that the LRG in our sample are preferentially located close to the centres of shell-like structures in the density field, with characteristics similar to those expected from BAO. We show that stacking selected shells, we can find their characteristic density profile. Conclusions. We delineate a new feature of the cosmic web, the BAO shells. As these are real spatial structures, the BAO phenomenon can be studied in detail by examining those shells.",
optnote="WOS:000305803300021",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=1088), last updated on Thu, 26 Jul 2012 11:02:01 +0000",
issn="0004-6361",
doi="10.1051/0004-6361/201118017",
opturl="http://arxiv.org/abs/1101.1911",
opturl="https://doi.org/10.1051/0004-6361/201118017",
archivePrefix="arXiv",
eprint="1101.1911",
language="English"
}