Mathematics – Logic
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21931205y&link_type=abstract
American Astronomical Society, AAS Meeting #219, #312.05
Mathematics
Logic
Scientific paper
Recent studies have shown that the number of peaks in weak lensing maps, obtained from large forthcoming surveys such as LSST, will contain significant cosmological information. We follow up on this finding, and use a suite of WL convergence maps, obtained from ray-tracing N-body simulations and halo finder to study (i) the physical origin of the WL peaks, and (ii) to contrast the statistics of WL peaks and their dependence on the background cosmology with those expected in a Gaussian random field. In particular, we find the number of peaks as a function of their height complements more traditional statistics, such as the WL power spectrum, and will tighten constraints on cosmological parameters.
These conclusions were derived from N-body simulations that neglect changes in the lensing potential due to the presence of baryons. To answer the question how baryons impact these results, we model the effect of baryons, by modifying the dark matter halo profiles in ray-tracing N-body simulations by hand, mimicking the cooling and condensation of baryons and star-formation in halos. This allows us to study (i) the impact of baryons on the WL peak counts, and (ii) to access how much the inferred cosmological parameters would be biased if the data were fit ignoring the baryons.
Haiman Zoltan
May Martin
Yang Xiuyuan
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