期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 436, 期 4, 页码 3089-3105出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt1791
关键词
surveys; cosmological parameters; large-scale structure of Universe
资金
- Australian Research Council
- STFC (UK)
- ARC (Australia)
- AAO
- STFC [ST/I00162X/1, ST/I001166/1, ST/J004650/1, ST/G001987/1, ST/J002291/1, ST/J001465/1, ST/K003577/1, ST/J001422/1, ST/H00131X/1, ST/I000976/1, ST/H008578/1, ST/I001212/1, ST/I003088/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/I000976/1, ST/G001987/1, ST/J001465/1, ST/J001422/1, ST/I001166/1, ST/H008578/1, ST/J002291/1, ST/I001212/1, ST/K003577/1, ST/J004650/1, ST/H00131X/1, ST/I00162X/1, ST/I003088/1] Funding Source: researchfish
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 deg(2). 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 f Sigma(8)(z = 0.18) = 0.36 +/- 0.09 and f Sigma(8)(z = 0.38) = 0.44 +/- 0.06, in agreement with standard GR gravity and other galaxy surveys at similar redshifts.
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