Sheng Wang et al. 2009 ApJ 691 547 doi:10.1088/0004-637X/691/1/547
Sheng Wang1,2,3, Zoltán Haiman4 and Morgan May1
Show affiliationsWe propose to use a simple observable, the fractional area of "hot spots" in weak gravitational lensing mass maps, which are detected with high significance, to determine background cosmological parameters. Because these high-convergence regions are directly related to the physical nonlinear structures of the universe, they derive cosmological information mainly from the nonlinear regime of density fluctuations. We show that in combination with future cosmic microwave background anisotropy measurements, this method can place constraints on cosmological parameters that are comparable to those from the redshift distribution of galaxy cluster abundances. The main advantage of the statistic proposed in this paper is that projection effects, normally the main source of uncertainty when determining the presence and the mass of a galaxy cluster, here serve as a source of information.
cosmology: theory; gravitational lensing; large-scale structure of universe; methods: numerical
Issue 1 (2009 January 20)
Received 2008 January 22, accepted for publication 2008 September 21
Published 2009 January 15
Sheng Wang et al. 2009 ApJ 691 547
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