An Improved Cluster Richness Estimator [electronic resource].
- Published:
- Washington, D.C. : United States. Dept. of Energy, 2009.
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:
- Stanford Linear Accelerator Center, 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:
- Minimizing the scatter between cluster mass and accessible observables is an important goal for cluster cosmology. In this work, we introduce a new matched filter richness estimator, and test its performance using the maxBCG cluster catalog. Our new estimator significantly reduces the variance in the L{sub X}-richness relation, from σ{sub lnL{sub X}}² = (0.86 ± 0.02)² to σ{sub lnL{sub X}}² = (0.69 ± 0.02)². Relative to the maxBCG richness estimate, it also removes the strong redshift dependence of the richness scaling relations, and is significantly more robust to photometric and redshift errors. These improvements are largely due to our more sophisticated treatment of galaxy color data. We also demonstrate the scatter in the L{sub X}-richness relation depends on the aperture used to estimate cluster richness, and introduce a novel approach for optimizing said aperture which can be easily generalized to other mass tracers.
- Report Numbers:
- E 1.99:slac-pub-13728
slac-pub-13728 - Subject(s):
- Other Subject(s):
- Note:
- Published through SciTech Connect.
08/03/2009.
"slac-pub-13728"
"arXiv:0809.2797"
Submitted to Astrophysical Journal FT
Johnston, David; McKay, Timothy; Annis, James T.; Scranton, Ryan; Rozo, Eduardo; Sheldon, Erin; Koester, Benjamin P.; Wechsler, Risa H.; Evrard, August; Hansen, Sarah; Becker, Matthew R.; Hao, Jiangang; Rykoff, Eli S.; Bleem, Lindsey. - Funding Information:
- AC02-76SF00515
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