Journal article

Measuring galaxy cluster masses with CMB lensing using a Maximum Likelihood estimator: statistical and systematic error budgets for future experiments

Srinivasan Raghunathan, Sanjaykumar Patil, Eric J Baxter, Federico Bianchini, Lindsey E Bleem, Thomas M Crawford, Gilbert P Holder, Alessandro Manzotti, Christian L Reichardt



We develop a Maximum Likelihood estimator (MLE) to measure the masses of galaxy clusters through the impact of gravitational lensing on the temperature and polarization anisotropies of the cosmic microwave background (CMB). We show that, at low noise levels in temperature, this optimal estimator outperforms the standard quadratic estimator by a factor of two. For polarization, we show that the Stokes Q/U maps can be used instead of the traditional E- and B-mode maps without losing information. We test and quantify the bias in the recovered lensing mass for a comprehensive list of potential systematic errors. Using realistic simulations, we examine the cluster mass uncertainties from CMB-clus..

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University of Melbourne Researchers


Awarded by National Science Foundation

Awarded by NSF Physics Frontier Center grant

Awarded by Cordon and Betty Moore Foundation

Awarded by Australian Research Council's Discovery Projects scheme

Awarded by U.S. Department of Energy

Awarded by Office of Polar Programs (OPP)

Funding Acknowledgements

We thank Kimmy Wu for revising the paper draft and Nathan Whitehorn for useful discussions. We thank the anonymous referee for some useful suggestions that helped in shaping this manuscript better. We thank the high performance computation centre at University of Melbourne for providing access to the cluster We acknowledge the use of HEALPix [49] and CAMB [51] routines. This work was performed in the context of the South Polo Telescope scientific program. SPT is supported by the National Science Foundation through grant PLR-1248097. Partial support is also provided by the NSF Physics Frontier Center grant PHY-1125897 to the Kavli Institute of Cosmological Physics at the University of Chicago, the Kavli Foundation and the Cordon and Betty Moore Foundation grant GBMF 947. The work at the University of Melbourne is supported by the Australian Research Council's Discovery Projects scheme (DP150103208). LB's work was supported under the U.S. Department of Energy contract DE-AC02-06CH11357.