Cosmological constraints from galaxy multi-tracers in the nearby Universe

Abstract

The Baryon Acoustic Oscillation (BAO) scale in the clustering of galaxies is a powerful standard ruler to measure cosmological distances and determine the geometry of the Universe. Past surveys have detected the BAO feature in the clustering of different galaxy samples, most of them composed of redder, quiescent galaxies and bluer, star-forming ones out to redshift $z\sim 1$. Besides these targets, new upcoming surveys will observe high-redshift galaxies with bright nebular emission lines out to $z\sim 2$, quasars and Lyman-$\alpha$ quasars at $z>2$. All these different galaxy targets will be used as multi-tracers of the same underlying dark matter field. By combining them over wide cosmological volumes, we will be able to beat cosmic variance and measure the growth of structure with unprecedented accuracy. In this work, we measure the BAO scale in the two-point auto- and cross-correlation functions of three independent populations of multi-tracers extracted from the SDSS DR7 Main galaxy sample at redshift $0.02<z<0.22$. Combining their covariances, we find accurate constraints on the shift parameter $\alpha =1.00\pm 0.04$ and $D_{\mathrm{V}}(z=0.1)/r_{\mathrm{s}}=2.92\pm 0.12$.

7 pages, 3 figures, 1 table

References in corpus (12)

• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• Wide-Field InfrarRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA 2015 Report
• Baryon Acoustic Oscillations in the Lyα forest of BOSS DR11 quasars
• Why your model parameter confidences might be too optimistic -- unbiased estimation of the inverse covariance matrix
• The Cosmic Linear Anisotropy Solving System (CLASS) I: Overview
• The DESI Experiment Part II: Instrument Design
• Dark Energy versus Modified Gravity
• Wide-Field InfraRed Survey Telescope (WFIRST) Final Report
• Constraining Anisotropic Baryon Oscillations
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Luminosity and Color Dependence and Redshift Evolution
• Dark Energy in Practice
• Predicting Hα emission line galaxy counts for future galaxy redshift surveys