Reyes, R. and Mandelbaum, R. and Hirata, C. and Bahcall, N. and Seljak, U. (2008) Improved optical mass tracer for galaxy clusters calibrated using weak lensing measurements. Monthly Notices of the Royal Astronomical Society, 390 (3). pp. 1157-1169. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:REYmnras08
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We develop an improved mass tracer for clusters of galaxies from optically observed parameters, and calibrate the mass relation using weak gravitational lensing measurements. We employ a sample of ~13 000 optically selected clusters from the Sloan Digital Sky Survey (SDSS) maxBCG catalogue, with photometric redshifts in the range 0.1–0.3. The optical tracers we consider are cluster richness, cluster luminosity, luminosity of the brightest cluster galaxy (BCG) and combinations of these parameters. We measure the weak lensing signal around stacked clusters as a function of the various tracers, and use it to determine the tracer with the least amount of scatter. We further use the weak lensing data to calibrate the mass normalization. We find that the best mass estimator for massive clusters is a combination of cluster richness, N200, and the luminosity of the BCG, LBCG: M200p = (1.27 ±0.08)(N200/20)^1.20±0.09[LBCG/LBCG(N200)]^0.71±0.14 × 10^14 h ^−1M⊙, where LBCG(N200) is the observed mean BCG luminosity at a given richness. This improved mass tracer will enable the use of galaxy clusters as a more powerful tool for constraining cosmological parameters.
|Additional Information:||© 2008 The Authors. Journal compilation © 2008 RAS. Accepted 2008 August 11. Received 2008 August 11; in original form 2008 February 17. We thank Ben Koester, Tim McKay, Erin Sheldon and Risa Wechsler for useful discussions regarding the maxBCG cluster catalogue. RM is supported by NASA through Hubble Fellowship grant # HSTHF- 01199.02-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555. CH is supported by the US Department of Energy under contract DEFG03- 02-ER40701. US is supported by the Packard Foundation and NSF CAREER-0132953.|
|Subject Keywords:||gravitational lensing; galaxies: clusters: general; cosmology: large scale structure of the Universe|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||22 Apr 2009 18:40|
|Last Modified:||26 Dec 2012 10:48|
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