QSO-galaxy correlations due to weak lensing in arbitrary Friedmann-Lemai̐tre cosmologies

• Verfasst von: Dolag, Klaus [VerfasserIn]
• Verfasst von: Bartelmann, Matthias [VerfasserIn]
• Titel: QSO-galaxy correlations due to weak lensing in arbitrary Friedmann-Lemai̐tre cosmologies
• Verf.angabe: Klaus Dolag and Matthias Bartelmann
• Fussnoten: Gesehen am 28.09.2017
• Titel Quelle: Enthalten in: De.arxiv.org
• Jahr Quelle: 2013
• Band/Heft Quelle: (2013) Artikel-Nummer 9704217, 10 Seiten
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1563900602

Abstract

We calculate the angular cross-correlation function between background QSOs and foreground galaxies induced by the weak lensing effect of large-scale structures. Results are given for arbitrary Friedmann-Lemaitre cosmologies. The non-linear growth of density perturbations is included. Compared to the linear growth, the non-linear growth increases the correlation amplitude by about an order of magnitude in an Einstein-de Sitter universe, and by even more for lower Omega_0. The dependence of the correlation amplitude on the cosmological parameters strongly depends on the normalization of the power spectrum. The QSO-galaxy cross-correlation function is most sensitive to density structures on scales in the range (1-10) Mpc/h, where the normalization of the power spectrum to the observed cluster abundance appears most appropriate. In that case, the correlation strength changes by less than a factor of <~ 2 when Omega_0 varies between 0.3 and 1, quite independent of the value of Omega_Lambda. For Omega_0 <~ 0.3, the correlation strength increases with decreasing Omega_0, and it scales approximately linearly with the Hubble constant h.