Stochastic bias of colour-selected BAO tracers by joint clustering-weak lensing analysis

Johan Comparat, Eric Jullo, Jean Paul Kneib, Carlo Schimd, Huan Yuan Shan, Thomas Erben, Olivier Ilbert, Joel Brownstein, Anne Ealet, Stephanie Escoffier, Bruno Moraes, Nick Mostek, Jeffrey A. Newman, M. E.S. Pereira, Francisco Prada, David J. Schlegel, Donald P. Schneider, Carlos H. Brandt

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


The baryon acoustic oscillation (BAO) feature in the two-point correlation function of galaxies supplies a standard ruler to probe the expansion history of the Universe. We study here 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, providing a highly biased galaxy sample. We analyse the angular galaxy clustering of galaxy selections at the redshifts 0.5, 0.7, 0.8, 1 and 1.2 and we combine this analysis with a halo occupation distribution (HOD) model to derive the properties of the haloes these galaxies inhabit, in particular the galaxy bias on large scales. We also perform a weak lensing analysis (aperture statistics) to extract the galaxy bias and the cross-correlation coefficient and compare to theHODprediction. We apply this analysis on a data set composed of the photometry of the deep co-addition on Sloan Digital Sky Survey (SDSS) Stripe 82 (225 deg2), of Canada-France-Hawaii Telescope/Stripe 82 deep i-band weak lensing survey and of the Wide-Field Infrared Survey Explorer infrared photometric band W1. The analysis on the SDSS-III/constant mass galaxies selection at z = 0.5 is in agreement with previous studies on the tracer, moreover we measure its cross-correlation coefficient r = 1.16 ± 0.35. For the higher redshift bins, we confirm the trends that the brightest galaxy populations selected are strongly biased (b > 1.5), but we are limited by current data sets depth to derive precise values of the galaxy bias. A survey using such tracers of the mass field will guarantee a high significance detection of the BAO.

Original languageEnglish (US)
Pages (from-to)1146-1160
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
StatePublished - Jul 2013

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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