Quantifying the statistics of CMB-lensing-derived galaxy cluster mass measurements with simulations

Author:

Zubeldia Íñigo12,Challinor Anthony123

Affiliation:

1. Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK

2. Kavli Institute for Cosmology Cambridge, Madingley Road, Cambridge CB3 0HA, UK

3. DAMTP, Centre for Mathematical Sciences, Wilberforce Road, Cambridge CB3 0WA, UK

Abstract

ABSTRACT Cosmic microwave background (CMB) lensing is a promising, novel way to measure galaxy cluster masses that can be used, e.g. for mass calibration in galaxy cluster counts analyses. Understanding the statistics of the galaxy cluster mass observable obtained with such measurements is essential if their use in subsequent analyses is not to lead to biased results. We study the statistics of a CMB lensing galaxy cluster mass observable for a Planck-like experiment with mock observations obtained from an N-body simulation. We quantify the bias and intrinsic scatter associated with this observable following two different approaches, one in which the signal due to the cluster and nearby correlated large-scale structure is isolated, and another one in which the variation due to uncorrelated large-scale structure is also taken into account. For our first approach, we also quantify deviations from lognormality in the scatter, finding them to have a negligible impact on mass calibration for our Planck-like experiment. We briefly discuss how some of our results change for experiments with higher angular resolution and lower noise levels, such as the current generation of surveys obtained with ground-based, large-aperture telescopes.

Funder

University of Cambridge

Science and Technology Facilities Council

Engineering and Physical Sciences Research Council

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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