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Designing a space-based galaxy redshift survey to probe dark energy

Wang, Y.; Percival, W.; Cimatti, A.; Mukherjee, P.; Guzzo, L.; Baugh, C.M.; Carbone, C.; Franzetti, P.; Garilli, B.; Geach, J.E.; Lacey, C.G.; Majerotto, E.; Orsi, A.; Rosati, P.; Samushia, L.; Zamorani, G.

Designing a space-based galaxy redshift survey to probe dark energy Thumbnail


Y. Wang

W. Percival

A. Cimatti

P. Mukherjee

L. Guzzo

C. Carbone

P. Franzetti

B. Garilli

J.E. Geach

E. Majerotto

A. Orsi

P. Rosati

L. Samushia

G. Zamorani


A space-based galaxy redshift survey would have enormous power in constraining dark energy and testing general relativity, provided that its parameters are suitably optimized. We study viable space-based galaxy redshift surveys, exploring the dependence of the Dark Energy Task Force (DETF) figure-of-merit (FoM) on redshift accuracy, redshift range, survey area, target selection and forecast method. Fitting formulae are provided for convenience. We also consider the dependence on the information used: the full galaxy power spectrum P(k), P(k) marginalized over its shape, or just the Baryon Acoustic Oscillations (BAO). We find that the inclusion of growth rate information (extracted using redshift space distortion and galaxy clustering amplitude measurements) leads to a factor of ∼3 improvement in the FoM, assuming general relativity is not modified. This inclusion partially compensates for the loss of information when only the BAO are used to give geometrical constraints, rather than using the full P(k) as a standard ruler. We find that a space-based galaxy redshift survey covering ∼20 000 deg2 over Graphic with σz/(1 +z) ≤ 0.001 exploits a redshift range that is only easily accessible from space, extends to sufficiently low redshifts to allow both a vast 3D map of the universe using a single tracer population, and overlaps with ground-based surveys to enable robust modelling of systematic effects. We argue that these parameters are close to their optimal values given current instrumental and practical constraints.


Wang, Y., Percival, W., Cimatti, A., Mukherjee, P., Guzzo, L., Baugh, C., …Zamorani, G. (2010). Designing a space-based galaxy redshift survey to probe dark energy. Monthly Notices of the Royal Astronomical Society, 409(2), 737-749.

Journal Article Type Article
Publication Date Dec 1, 2010
Deposit Date Jan 31, 2012
Publicly Available Date Feb 19, 2015
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 409
Issue 2
Pages 737-749
Keywords Cosmology: observations, Distance scale, Large-scale structure of Universe.


Published Journal Article (910 Kb)

Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2010 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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