期刊
ASTROPHYSICAL JOURNAL
卷 713, 期 2, 页码 1207-1218出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/713/2/1207
关键词
cosmological parameters; cosmology: theory; galaxies: clusters: general; galaxies: halos; methods: statistical
资金
- U.S. Department of Energy [DE-AC02-76SF00515]
- McMicking and Gabilan Stanford Graduate
- Stanford University
- NSF [0707985]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0707985] Funding Source: National Science Foundation
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.
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