Is There a Group Halo?

Details Is There a Group Halo? Is There a Group Halo?

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sgdh.conf...85m&link_type=abstract

THE SHAPES OF GALAXIES AND THEIR DARK HALOS. Proceedings of the Yale Cosmology Workshop. Held 28-30 May 2001 in New Haven, Conne

Computer Science

Scientific paper

We study gravitational lensing by groups of galaxies in both the strong and weak lensing regime. As the abundance of groups is high, gravitational lensing by groups is likely to be important observationally. Here, we examine the shear, magnification, image geometries and time delays produced by compact groups and discuss how these observables depend on the details of the mass distribution in the group. We find that in the weak lensing regime a tangential shear signal of order 3 per cent is to be expected and that it depends measurably on the mass distribution in the group. In the strong lensing regime we show that a group's potential may have a significant effect on the measured image geometries, magnification ratios and time delays for individual multiple-image systems. We also find that some statistical lensing properties, like the distribution of time delays, depend on the details of the groups mass distribution.

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