Annealing a follow-up program: Improvement of the dark energy figure of merit for optical galaxy cluster surveys

Hao Yi Wu, Eduardo Rozo, Risa H. Wechsler

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The precision of cosmological parameters derived from galaxy cluster surveys is limited by uncertainty in relating observable signals to cluster mass. We demonstrate that a small mass-calibration follow-up program can significantly reduce this uncertainty and improve parameter constraints, particularly when the follow-up targets are judiciously chosen. To this end, we apply a simulated annealing algorithm to maximize the dark energy information at fixed observational cost, and find that optimal follow-up strategies can reduce the observational cost required to achieve a specified precision by up to an order of magnitude. Considering clusters selected from optical imaging in the Dark Energy Survey, we find that approximately 200 low-redshift X-ray clusters or massive Sunyaev-Zel'dovich clusters can improve the dark energy figure of merit by 50%, provided that the follow-up mass measurements involve no systematic error. In practice, the actual improvement depends on (1) the uncertainty in the systematic error in follow-up mass measurements, which needs to be controlled at the 5% level to avoid severe degradation of the results and (2) the scatter in the optical richness-mass distribution, which needs to be made as tight as possible to improve the efficacy of follow-up observations.

Original languageEnglish (US)
Pages (from-to)1207-1218
Number of pages12
JournalAstrophysical Journal
Volume713
Issue number2
DOIs
StatePublished - 2010
Externally publishedYes

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annealing
dark energy
figure of merit
galaxies
energy
systematic errors
costs
simulated annealing
mass distribution
cost
programme
degradation
calibration
x rays
parameter

Keywords

  • Cosmological parameters
  • Cosmology: theory
  • Galaxies: clusters: general
  • Galaxies: halos
  • Methods: statistical

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Annealing a follow-up program : Improvement of the dark energy figure of merit for optical galaxy cluster surveys. / Wu, Hao Yi; Rozo, Eduardo; Wechsler, Risa H.

In: Astrophysical Journal, Vol. 713, No. 2, 2010, p. 1207-1218.

Research output: Contribution to journalArticle

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