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

Chris Blake; I. K. Baldry; J. Bland-Hawthorn; L. Christodoulou; M. Colless; C. Conselice; S. P. Driver; A. M. Hopkins; J. Liske; J. Loveday; P. Norberg; J. A. Peacock; G. B. Poole; A. S.G. Robotham

doi:10.1093/mnras/stt1791

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

Chris Blake^*, I. K. Baldry, J. Bland-Hawthorn, L. Christodoulou, M. Colless, C. Conselice, S. P. Driver, A. M. Hopkins, J. Liske, J. Loveday, P. Norberg, J. A. Peacock, G. B. Poole, A. S.G. Robotham

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

170 Citations (Scopus)

Abstract

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

Original language	English
Pages (from-to)	3089-3105
Number of pages	17
Journal	Monthly Notices of the Royal Astronomical Society
Volume	436
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stt1791
Publication status	Published - Dec 2013

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Blake, C., Baldry, I. K., Bland-Hawthorn, J., Christodoulou, L., Colless, M., Conselice, C., Driver, S. P., Hopkins, A. M., Liske, J., Loveday, J., Norberg, P., Peacock, J. A., Poole, G. B., & Robotham, A. S. G. (2013). Galaxy And Mass Assembly (GAMA): Improved cosmic growth measurements using multiple tracers of large-scale structure. Monthly Notices of the Royal Astronomical Society, 436(4), 3089-3105. https://doi.org/10.1093/mnras/stt1791

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title = "Galaxy And Mass Assembly (GAMA): Improved cosmic growth measurements using multiple tracers of large-scale structure",

abstract = "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",

keywords = "Cosmological parameters, Large-scale structure of Universe, Surveys",

author = "Chris Blake and Baldry, {I. K.} and J. Bland-Hawthorn and L. Christodoulou and M. Colless and C. Conselice and Driver, {S. P.} and Hopkins, {A. M.} and J. Liske and J. Loveday and P. Norberg and Peacock, {J. A.} and Poole, {G. B.} and Robotham, {A. S.G.}",

year = "2013",

month = dec,

doi = "10.1093/mnras/stt1791",

language = "English",

volume = "436",

pages = "3089--3105",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

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Blake, C, Baldry, IK, Bland-Hawthorn, J, Christodoulou, L, Colless, M, Conselice, C, Driver, SP, Hopkins, AM, Liske, J, Loveday, J, Norberg, P, Peacock, JA, Poole, GB & Robotham, ASG 2013, 'Galaxy And Mass Assembly (GAMA): Improved cosmic growth measurements using multiple tracers of large-scale structure', Monthly Notices of the Royal Astronomical Society, vol. 436, no. 4, pp. 3089-3105. https://doi.org/10.1093/mnras/stt1791

TY - JOUR

T1 - Galaxy And Mass Assembly (GAMA)

T2 - Improved cosmic growth measurements using multiple tracers of large-scale structure

AU - Blake, Chris

AU - Baldry, I. K.

AU - Bland-Hawthorn, J.

AU - Christodoulou, L.

AU - Colless, M.

AU - Conselice, C.

AU - Driver, S. P.

AU - Hopkins, A. M.

AU - Liske, J.

AU - Loveday, J.

AU - Norberg, P.

AU - Peacock, J. A.

AU - Poole, G. B.

AU - Robotham, A. S.G.

PY - 2013/12

Y1 - 2013/12

N2 - 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

AB - 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

KW - Cosmological parameters

KW - Large-scale structure of Universe

KW - Surveys

UR - http://www.scopus.com/inward/record.url?scp=84889253482&partnerID=8YFLogxK

U2 - 10.1093/mnras/stt1791

DO - 10.1093/mnras/stt1791

M3 - Article

SN - 0035-8711

VL - 436

SP - 3089

EP - 3105

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

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

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