Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-12-09
Astronomy and Astrophysics
Astrophysics
5 pages, 4 figures
Scientific paper
10.1016/S0370-2693(00)00763-2
Recently, Holz and Wald (1998) have presented a method for determining gravitational lensing effects in inhomogeneous universes. Their use of realistic galaxy models has been limited to the singular, truncated isothermal sphere with a fixed mass. In this paper, their method is generalized to allow for matter distributions more accurately describing the actual properties of galaxies, as derived from observations and N-body simulations. This includes the density profile proposed by Navarro, Frenk and White, as well as a distribution of galaxy masses. As an example of the possible applications of the method, we consider lensing effects on supernova luminosity distributions. We find that results for different mass distributions of smooth dark matter halos are very similar, making lensing effects predictable for a broad range of halo profiles. We also note, in agreement with other investigations, that one should be able to discriminate smooth halos from a dominant component of dark matter in compact objects. For instance, a sample of 100 supernovae at redshift z=1 can, with 99 % certainty, discriminate the case where all matter is in compact objects from the case where matter is in smooth halos.
Goliath Martin
Moertsell Edvard
No associations
LandOfFree
Gravitational lensing of Type Ia supernovae 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 Gravitational lensing of Type Ia supernovae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gravitational lensing of Type Ia supernovae will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-23463