Galaxy And Mass Assembly (GAMA): improved cosmic growth measurements using multiple tracers of large-scale structure

By C. Blake, I. Baldry, Joss Bland-Hawthorn, L. Christodoulou, M. Colless, Christopher J. Conselice, S. Driver, Andrew M. Hopkins, J. Liske, J. Loveday and 4 more. 2013

201 citations recorded by the source corpus.

We present the ﬁrst application of a ‘multiple-tracer’ redshift-space distortion (RSD) analysis to an observational galaxy sample, using data from the Galaxy and Mass Assembly (GAMA) survey. Our data set is an r < 19.8 magnitude-limited sample of 178 579 galaxies covering the redshift interval z < 0.5 and area 180 deg2. We obtain improvements of 10–20 per cent in measurements of the gravitational growth rate compared to a single-tracer analysis, deriving from the correlated sample variance imprinted in the distributions of the overlapping galaxy populations. We present new expressions for the covariances between the auto-power and cross-power spectra of galaxy samples that are valid for a general survey selection function and weighting scheme. We ﬁnd no evidence for a systematic dependence of the measured growth rate on the galaxy tracer used, justifying the RSD modelling assumptions, and validate our results using mock catalogues from N-body simulations. For multiple tracers selected by galaxy colour, we measure normalized growth rates in two independent redshift bins fσ8(z = 0.18) = 0.36 ± 0.09 and fσ8(z = 0.38) = 0.44 ± 0.06, in agreement with standard GR gravity and other galaxy surveys at similar redshifts

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/f05718133c11e1e9ea0ee07aa524c3f7bf3407ee

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Citations in the corpus

Testing ΛCDM at the lowest redshifts with SN Ia and galaxy velocities (2016, background): “ red data point. We also show past measurements of the same quantity from 6dFGS at z’0 and SNe (black leftmost data point [24]), SNe alone (purple data point [26]), 6dFGS alone at z= 0:067 [64], GAMA [65], WiggleZ [66], BOSS [67], and VIPERS [68]. The solid line shows the prediction corresponding to”
Evolution of the f σ 8 tension with the Planck 15 / Λ CDM determination and implications for modified gravity theories (2018, unknown): “060 [86] 22 September 2013 22 BOSS-LOWZ 0.”
The DESI Bright Galaxy Survey: Final Target Selection, Design, and Validation (2022, background): “…door to innovative techniques such as “multitracer” methods that exploit galaxy populations with different clustering properties (e.g., McDonald & Seljak 2009; Seljak 2009; Blake et al. 2013; Wang & Zhao 2020) and methods that forward model the small-scale density field (e.g., Seljak et al. 2017).”
The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample (2016, result): “The right panel of Figure 15 compares our measurements of fσ8 results those from other surveys: 2dfGRS (Percival et al. 2004b), 6dFGS (Beutler et al. 2012), GAMA (Blake et al. 2013), WiggleZ (Blake et al. 2012), VVDS (Guzzo et al. 2008), and VIPERS (de la Torre et al. 2013), as well as the measureme”
The power spectrum and bispectrum of SDSS DR11 BOSS galaxies – I. Bias and gravity (2014, methodology): “Except for narrow angle surveys (Blake et al. 2013), higher order multipoles, such as the quadrupole or hexadecapole, require a more complex estimator, such as described by Yamamoto et al. (2006), as is implemented in Beutler et al. (2014) for the CMASS DR11 galaxy sample.”