Baryonic effects on weak-lensing two-point statistics and its cosmological implications

• DOI: 10.48550/arxiv.1410.6826
• Publication Date: 2014-01-01
• Authors: Irshad Mohammed; Davidé Martizzi; A. Amara; Romain Teyssier
• Keywords: Matter power spectrum

We develop an extension of \textit{the Halo Model} that describes analytically the corrections to matter power spectrum due physics baryons. extend these weak-lensing shear angular spectrum. Within each halo, our baryonic model accounts for: 1) a central galaxy, major stellar component whose properties are derived from abundance matching techniques; 2) hot plasma in hydrostatic equilibrium and 3) adiabatically-contracted dark component. This analytic approach allows us compare dark-matter-only case. Our basic assumptions tested against hydrodynamical simulations Martizzi et. al. (2014), with which remarkable agreement is found. has only one free parameter, $M_{\rm crit}$, critical halo mass marks transition between feedback-dominated halos, mostly devoid gas, gas rich AGN feedback effects become weaker. explore entire cosmological parameter space, using three redshift bins as observable, assuming Euclid-like survey. derive corresponding constraints on parameters, well possible bias introduced by neglecting physics. find that, up $\ell_{max}$=4000, plays very little role parameters estimation. However, if goes $\ell_{max}$=8000, marginalized errors can be significantly reduced, but lead recovered 10$σ$. These biases removed takes into account main also determined 1-2\%, along other parameters.