The Environments of Gravitational Lenses: Constraining Cosmology and Galaxy Structure

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Strong gravitational lenses are becoming increasingly more useful probes of cosmology and galaxy structure as observations and models of lenses improve. However, ignoring the environments of these lenses can lead to substantial biases in obtaining and interpreting science results from strong lenses. I have taken a census of lens environments to statistically quantify this bias; this is a critical step toward analyzing future datasets of hundreds of strong lenses (ie. from SNAP and LSST). Furthermore, knowledge of the lens environments can help in the interpretation of structural parameters of the lenses. In particular, I have found that lenses that are best modeled with steep mass slopes are likely to be associated with a perturbing companion, as is suggested by N-body simulations. These lenses may serve as a unique probe of galaxy-galaxy interactions.

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