Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-05-15
Astrophys.J. 559 (2001) 572-583
Astronomy and Astrophysics
Astrophysics
23 pages, 8 figures, accepted for publication in ApJ
Scientific paper
10.1086/322513
We study the arc statistics of gravitational lensing generated by dark matter halos in order to probe their density profile. We characterize the halo profile by two parameters, the inner slope of the central cusp $\alpha$, and the median amplitude of the concentration parameter, $c_{\rm norm}$, for a halo of mass $10^{14}h^{-1}M_\odot$ at $z=0$, and compute the numbers of tangential and radial arcs produced by gravitational lensing of galaxy clusters. We find that the number of arcs divided by the number of halos is a good statistic which is sensitive to both $c_{\rm norm}$ and $\alpha$ with very weak dependence on the cosmological parameters. If the arc samples with well-defined selection criteria for the clusters become available, one can strongly constrain both $c_{\rm norm}$ and $\alpha$. While our tentative comparison with the existing observational data indicates that the inner density profile of dark halos is indeed as steep as predicted by recent simulations ($\alpha \sim 1.5$), the homogeneous samples of tangential and radial arcs are required for more quantitative discussions.
Oguri Masamune
Suto Yasushi
Taruya Atsushi
No associations
LandOfFree
Probing the Core Structure of Dark Halos with Tangential and Radial Arc Statistics 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 Probing the Core Structure of Dark Halos with Tangential and Radial Arc Statistics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Probing the Core Structure of Dark Halos with Tangential and Radial Arc Statistics will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-61162