J/A+A/542/A34 Baryon Acoustic Oscillations in LRGs (Arnalte-Mur+, 2012) ================================================================================ Wavelet analysis of baryon acoustic structures in the galaxy distribution. Arnalte-Mur P., Labatie A., Clerc N., Martinez V.J., Starck J.-L., Lachieze-Rey M., Saar E., Paredes S. =2012A&A...542A..34A ================================================================================ ADC_Keywords: Galaxy catalogs ; Redshifts Keywords: large-scale structure of Universe - distance scale - galaxies: cluster: general - methods: data analysis - methods: statistical Abstract: Baryon Acoustic Oscillations (BAO) have been previously detected using correlation functions and power spectra of the galaxy distribution. In this work, we present a new method for the detection of the real-space structures associated with this feature. These baryon acoustic structures are spherical shells with a relatively small density contrast, surrounding high density central regions. We design a specific wavelet adapted to the 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 apply our method to the detection of BAO in a galaxy sample drawn from the Sloan Digital Sky Survey (SDSS). We use the 'Main' catalogue to trace the shells, and the Luminous Red Galaxies (LRG) as tracers of the high density central regions. Description: We present the data for the LRG sample used, including the value of W_max_. W_max_ is the value of the wavelet coefficient of the transformation for the values of the parameters R (radius) and s (width) that give the maximum of the global statistic B(R,s). In this way, the values W_max_ are a measure of how strong is the signal coming from a BAO shell around a given LRG. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 68 1599 Basic characteristics and W_max_ for the sample of Luminous Red Galaxies (LRG) used -------------------------------------------------------------------------------- See also: J/MNRAS/372/425 : 2dF-SDSS Luminous Red Galaxy Survey, 2SLAQ (Cannon+, 2006) J/MNRAS/375/68 : MegaZ-LRG catalogue (Collister+, 2007) J/MNRAS/377/787 : SDSS Luminous Red Galaxies (Barber+, 2007) J/MNRAS/380/1608 : LRG catalog (Lopes+, 2007) J/MNRAS/387/1323 : SDSS photometry of luminous red galaxies (Ross+, 2008) http://www.sdss.org : SDSS Home Page Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 5 A5 --- --- [SDSS_] 6- 24 A19 --- SDSS SDSS object name (JHHMMSS.ss+DDMMSS.s) 26- 34 F9.5 deg RAdeg Right ascension in decimal degrees (J2000) 36- 44 F9.5 deg DEdeg Declination in decimal degrees (J2000) 46- 52 F7.5 --- z Redshift (from SDSS) 54- 60 F7.5 --- e_z Redshift uncertainty 62- 68 F7.2 --- Wmax Value of W_max_ coefficient (1) -------------------------------------------------------------------------------- Note (1): W_max_=W_Rmax,Smax_ is a measure of the strength of the signal coming from a Baryon Acoustic Oscillations (BAO) shell around a given point, and in particular, a given LRG. Therefore, using W_max_ we can localise in configuration space the regions of the volume covered by our samples where the BAO signal mostly originates. -------------------------------------------------------------------------------- Acknowledgements: Pablo Arnalte-Mur, pablo.arnalte-mur(at)durham.ac.uk ================================================================================ (End) Pablo Arnalte-Mur [Durham Univ., UK], Patricia Vannier [CDS] 03-May-2012