[AAA] RECORDATORIO HOY 14 hs. SEMINARIO IATE. Using gravitational lensing to measure cluster halo shapes

[Seminarios IATE - Conicet]

*Título: Using gravitational lensing to measure cluster halo shapes*

*Expositora: *Dra. Elizabeth Gonzalez (IATE)

*Fecha: *viernes 20 de mayo, 14 hs.

*Resumen:* Shape measurements of dark matter halos constitute a test of the
current cosmological ΛCDM paradigm, since they are sensitive to the initial
density field and halo assembly. Moreover, determining halo shapes can also
serve as a probe of the fundamental particle nature of dark matter.
Nevertheless, deriving observational estimates of cluster dark matter halo
shapes is challenging, being gravitational lensing one of the most
promising observational techniques. In particular, weak lensing stacking
techniques can be applied in order to obtain the median projected
ellipticity of a sample of halos. If the lensing signal is combined
considering the orientation of the cluster projected mass distribution, the
resulting stacked mass density can be modelled to derive the projected
ellipticity of the total mass surface density. In this presentation, we
review how the shape of the projected surface distribution of galaxy
clusters can be obtained using this technique. We present the results of
observational studies and also, using simulations, we evaluate the
introduced bias in deriving the projected aligned ellipticity of cluster
size halos.

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