Lensing corrections to features in the angular two-point correlation function and power spectrum

摘要: It is well known that magnification bias, the modulation of galaxy or quasar source counts by gravitational lensing, can change observed angular correlation function. We investigate magnification-induced changes to shape function w({theta}), and power spectrum C{sub l}, paying special attention matter-radiation equality peak baryon wiggles. Lensing effectively mixes galaxies with matter at lower redshifts lenses distorting quantify how lensing corrections depend on width selection function, bias b, number count slope s. The correction increases redshift larger are present for sources steep slopes and/or broad distributions. most drastic l} occur measurements high (z > approx. 1.5) low multipole moment (l 0.5% broadening 20% only very functions (5s-2)/b 2. However, near bump not constant but a gently varying which depends population. Depending w({theta}) data fitted, this may need be accounted when using acoustic scale precision cosmology.« less