Hildebrandt, H. and Muzzin, A. and Erben, T. and Hoekstra, H. and Kuijken, K. and Surace, J. and van Waerbeke, L. and Wilson, G. and Yee, H. K. C. (2011) Lensing Magnification: A Novel Method to Weigh High-redshift Clusters and its Application to SpARCS. Astrophysical Journal Letters, 733 (2). Art. No. L30. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20110831-114349258
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We introduce a novel method to measure the masses of galaxy clusters at high redshift selected from optical and IR Spitzer data via the red-sequence technique. Lyman-break galaxies are used as a well-understood, high-redshift background sample allowing mass measurements of lenses at unprecedented high redshifts using weak lensing magnification. By stacking a significant number of clusters at different redshifts with average masses of ~(1-3) × 10^(14) M☉, as estimated from their richness, we can calibrate the normalization of the mass-richness relation. With the current data set (area: 6 deg^2) we detect a magnification signal at the >3σ level. There is good agreement between the masses estimated from the richness of the clusters and the average masses estimated from magnification, albeit with large uncertainties. We perform tests that suggest the absence of strong systematic effects and support the robustness of the measurement. This method—when applied to larger data sets in the future—will yield an accurate calibration of the mass-observable relations at z ≳ 1 which will represent an invaluable input for cosmological studies using the galaxy cluster mass function and astrophysical studies of cluster formation. Furthermore, this method will probably be the least expensive way to measure masses of large numbers of z > 1 clusters detected in future IR-imaging surveys.
|Additional Information:||© 2011 The American Astronomical Society. Received 2011 March 14; accepted 2011 April 25; published 2011 May 9. Our study is based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the CFHT which is operated by theNRCof Canada, the CNRS of France, and the University of Hawaii and on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. This work is based in part on data products produced at TERAPIX and CADC. We thank the CFHTLenS team for their work on the CFHTLenS data products which are used in this study. H. Hildebrandt is supported by the Marie Curie IOF 252760 and by a CITA National Fellowship. T.E. is supported by the BMBF through project “GAVO III” and by the DFG through project ER 327/3-1 and the TR 33. H. Hoekstra acknowledges support from the NWO and a Marie Curie IRG. L.v.W. is supported by NSERC and CIfAR. G.W. acknowledges support from NSF grant AST-0909198. Facilities: Spitzer, CFHT|
|Subject Keywords:||galaxies: clusters: general; galaxies: photometry|
|Classification Code:||PACS: 95.75.-z; 98.65.Cw; 98.62.Sb; 98.62.Py|
|Official Citation:||Lensing Magnification: A Novel Method to Weigh High-redshift Clusters and its Application to SpARCS H. Hildebrandt et al. 2011 ApJ 733 L30|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||01 Sep 2011 19:55|
|Last Modified:||26 Dec 2012 13:39|
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