IMPROVEMENT OF THE RICHNESS ESTIMATES OF maxBCG CLUSTERS

Rozo, Eduardo; Rykoff, E. S.; Koester, Benjamin P.; McKay, Timothy A.; Hao, Jiangang; Evrard, A. E.; Wechsler, Risa H.; Hansen, S. M.; Sheldon, E.; Johnston, David; Becker, M. R.; Annis, J.; Bleem, L. E.; Scranton, Ryan

doi:10.1088/0004-637x/703/1/601

Cited by 93 publications

(113 citation statements)

References 88 publications

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“…For example, a Poisson distribution for a cluster with N = 10 galaxies corresponds to a skewness γ ≈ 0.3. This discussion demonstrates the value of finding improved optical richness estimators that have lower scatter relative to mass (Rozo et al, 2009;Rykoff et al, 2012). Figure 29 shows the impact that various elements of P (X|M, z) can have on the recovered cluster counts.…”

Section: Statistical Errormentioning

confidence: 90%

Observational probes of cosmic acceleration

et al. 2013

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The accelerating expansion of the universe is the most surprising cosmological discovery in many decades, implying that the universe is dominated by some form of "dark energy" with exotic physical properties, or that Einstein's theory of gravity breaks down on cosmological scales. The profound implications of cosmic acceleration have inspired ambitious efforts to understand its origin, with experiments that aim to measure the history of expansion and growth of structure with percent-level precision or higher. We review in detail the four most well established methods for making such measurements: Type Ia supernovae, baryon acoustic oscillations (BAO), weak gravitational lensing, and the abundance of galaxy clusters. We pay particular attention to the systematic uncertainties in these techniques and to strategies for controlling them at the level needed to exploit "Stage IV" dark energy facilities such as BigBOSS, LSST, Euclid, and WFIRST. We briefly review a number of other approaches including redshift-space distortions, the Alcock-Paczynski effect, and direct measurements of the Hubble constant H 0 . We present extensive forecasts for constraints on the dark energy equation of state and parameterized deviations from General Relativity, achievable with Stage III and Stage IV experimental programs that incorporate supernovae, BAO, weak lensing, and cosmic microwave background data. We also show the level of precision required for clusters or other methods to provide constraints competitive with those of these fiducial programs. We emphasize the value of a balanced program that employs several of the most powerful methods in combination, both to cross-check systematic uncertainties and to take advantage of complementary information. Surveys to probe cosmic acceleration produce data sets that support a wide range of scientific investigations, and they continue the longstanding astronomical tradition of mapping the universe in ever greater detail over ever larger scales.

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Section: Statistical Errormentioning

confidence: 90%

Observational probes of cosmic acceleration

et al. 2013

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“…Fortunately, reducing the scatter of the mass-richness relation (see e.g. Reyes et al 2008;Rozo et al 2008b) may help reduce the number of follow up observations necessary to achieve improved constraints.…”

Section: Discussionmentioning

confidence: 99%

Cosmological Constraints from the SDSS maxBCG Cluster Catalog

Rozo

Rykoff²,

McKay³

et al. 2009

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We use the abundance and weak lensing mass measurements of the SDSS maxBCG cluster catalog to simultaneously constrain cosmology and the richness-mass relation of the clusters. Assuming a flat ΛCDM cosmology, we find σ 8 (Ω m /0.25) 0.41 = 0.832 ± 0.033 after marginalization over all systematics. In common with previous studies, our error budget is dominated by systematic uncertainties, the primary two being the absolute mass scale of the weak lensing masses of the maxBCG clusters, and uncertainty in the scatter of the richness-mass relation. Our constraints are fully consistent with the WMAP five-year data, and in a joint analysis we find σ 8 = 0.807 ± 0.020 and Ω m = 0.265 ± 0.016, an improvement of nearly a factor of two relative to WMAP5 alone. Our results are also in excellent agreement with and comparable in precision to the latest cosmological constraints from X-ray cluster abundances. The remarkable consistency among these results demonstrates that cluster abundance constraints are not only tight but also robust, and highlight the power of optically-selected cluster samples to produce precision constraints on cosmological parameters.

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“…The measurements indicate a power-law relation between mass and richness. Rozo et al (2009a) measured a logarithmic scatter in mass at fixed richness of σ ln M|N200 = 0.45 +0.20 −0.18 (with 95% confidence) at N 200 ≈ 40, where N 200 is the number of red-sequence galaxies within r 200 . Sheldon et al (2009) measured the optical luminosities of the clusters in this sample.…”

Section: Optical Scaling Relationsmentioning

confidence: 91%

Scaling Relations for Galaxy Clusters: Properties and Evolution

et al. 2013

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Well-calibrated scaling relations between the observable properties and the total masses of clusters of galaxies are important for understanding the physical processes that give rise to these relations. They are also a critical ingredient for studies that aim to constrain cosmological parameters using galaxy clusters. For this reason much effort has been spent during the last decade to better understand and interpret relations of the properties of the intra-cluster medium. Improved X-ray data have expanded the mass range down to galaxy groups, whereas SZ surveys have openened a new observational window on the intracluster medium. In addition, continued progress in the performance of cosmological simulations has allowed a better understanding of the physical processes and selection effects affecting the observed scaling relations. Here we review the recent literature on various scaling relations, focussing on the latest observational measurements and the progress in our understanding of the deviations from self similarity.

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IMPROVEMENT OF THE RICHNESS ESTIMATES OF maxBCG CLUSTERS

Cited by 93 publications

References 88 publications

Observational probes of cosmic acceleration

Observational probes of cosmic acceleration

Cosmological Constraints from the SDSS maxBCG Cluster Catalog

Scaling Relations for Galaxy Clusters: Properties and Evolution

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