Weak Gravitational Lensing and Cluster Mass Estimates

Details Weak Gravitational Lensing and Cluster Mass Estimates Weak Gravitational Lensing and Cluster Mass Estimates

1999-04-13

arxiv.org/abs/astro-ph/9904156v1

Astrophys.J.520:L9,1999

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures. LaTeX2e, uses emulateapj.sty and onecolfloat.sty. To be submitted to the Astrophysical Journal Letters

Scientific paper

10.1086/312144

Hierarchical theories of structure formation predict that clusters of galaxies should be embedded in a web like structure, with filaments emanating from them to large distances. The amount of mass contained within such filaments near a cluster can be comparable to the collapsed mass of the cluster itself. Diffuse infalling material also contains a large amount of mass. Both these components can contribute to the cluster weak lensing signal. This ``projection bias'' is maximized if a filament lies close to the line-of-sight to a cluster. Using large--scale numerical simulations of structure formation in a cosmological constant dominated cold dark matter model, we show that the projected mass typically exceeds the actual mass by several tens of percent. This effect is significant for attempts to estimate cluster masses through weak lensing observations, and will affect weak lensing surveys aimed at constructing the cluster mass function.

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