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A New Model to Predict Weak Lensing Peak Counts

Published online by Cambridge University Press:  01 July 2015

Chieh-An Lin  and
Martin Kilbinger
Chieh-An Lin
Affiliation:
Service d'Astrophysique, CEA Saclay, Orme des Merisiers, Bât 709, 91191 Gif-sur-Yvette, France email: [email protected]
Martin Kilbinger
Affiliation:
Service d'Astrophysique, CEA Saclay, Orme des Merisiers, Bât 709, 91191 Gif-sur-Yvette, France email: [email protected]
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Abstract

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Peak statistics from weak gravitational lensing have been shown to be a promising tool for cosmology. Here we propose a new approach to predict weak lensing peak counts. For an arbitrary cosmology, we draw dark matter halos from the halo mass function, and calculate the number of peaks from the projected halo mass distribution. This procedure is much faster than time-consuming N-body simulations. By comparing these “fast simulations” to N-body runs, we find that the peak abundance is in very good agreement. Furthermore, our model is able to discriminate cosmologies with different sets of parameters, using high signal-to-noise peaks (≳ 4). This encourages us to examine the optimal combinations of parameters to this approach in the future.

Keywords

peak countingmass functionweak lensing
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Symposium S306: Statistical Challenges in 21st Century Cosmology , May 2014 , pp. 107 - 109
Copyright
Copyright © International Astronomical Union 2015 

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