Annealing a Follow-up Program [electronic resource] : Improvement of the Dark Energy Figure of Merit for Optical Galaxy Cluster Surveys
- Published:
- Washington, D.C. : United States. Dept. of Energy, 2010.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description:
- 12 pages : digital, PDF file
- Additional Creators:
- SLAC National Accelerator Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Summary:
- 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.
- Report Numbers:
- E 1.99:slac-pub-14017
slac-pub-14017 - Subject(s):
- Other Subject(s):
- Note:
- Published through SciTech Connect.
06/02/2010.
"slac-pub-14017"
"arXiv:0907.2690"
Astrophys.J. 713:1207-1218,2010 713 2 ISSN 0004-637X; ASJOAB FT
Rozo, Eduardo; Wechsler, Risa H.; Wu, Hao-Yi. - Funding Information:
- AC02-76SF00515
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