Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-12-09
Astronomy and Astrophysics
Astrophysics
18 pages, 27 figures, uses aa.cls. To appear in Astron. Astrophys
Scientific paper
Recently, Holz & Wald have presented a new method for determining gravitational lensing effects on, e.g., supernova luminosity versus redshift measurements in inhomogeneous universes. In this paper, their method is generalized in several ways: First, the matter content is allowed to consist of several different types of fluids, possibly with non-vanishing pressure. Second, besides lensing by simple point masses and singular isothermal spheres, the more realistic halo dark matter distribution proposed by Navarro, Frenk & White (NFW), based on N-body simulation results, is treated. We discuss various aspects of the accuracy of the method, such as luminosity corrections, and statistics, for multiple images. We find in agreement with other recent work that a large sample of supernovae at large redshift could be used to extract gross features of the mass distribution of the lensing dark matter halos, such as the existence of a large number of point-like objects. The results for the isothermal sphere and the NFW model are, however, very similar if normalized to the observed luminosity distribution of galaxies. We give convenient analytical fitting formulas for our computed lensing probabilites as a function of magnification, for several redshifts.
Bergstrom Lars
Goliath Martin
Goobar Ariel
Moertsell Edvard
No associations
LandOfFree
Lensing effects in an inhomogeneous universe does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Lensing effects in an inhomogeneous universe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lensing effects in an inhomogeneous universe will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-23453