A Last Look at the First Gravitational Lens

Details A Last Look at the First Gravitational Lens A Last Look at the First Gravitational Lens

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hst..prop10569k&link_type=abstract

HST Proposal ID #10569

Astronomy and Astrophysics

Astrophysics

Hst Proposal Id #10569 Cosmology

Scientific paper

Strong gravitational lensing provides our best probe of the behavior of dark matter in galaxy halos and their substructure. We undertake ACS imaging to gain new strong and weak lensing data for the first-discovered lens system Q0957+561. We will make a weak lensing image spanning 6' to map the potential of the cluster around the lens galaxy, and simultaneously obtain a deep image of more than 10 multiply-imaged features in the strong lensing region. This will complete HST's legacy dataset for Q0957+561: a deep multicolor image of a rich multiple-image system, an extremely high-quality weak lensing map, and an existing deep NICMOS image of the Einstein ring. We will combine these three kinds of data into a single lens model--a first--to produce a sophisticated dark matter map that will provide a uniquely detailed view of the relation between visible and dark matter on galaxy scales, and the best available constraints on dark substructure. In addition, the best available H_0 measurement from lensing will potentially allow us to leverage the WMAP data into a more precise measurement of dark energy properties as well. Astrophysics with strong lensing depends crucially on HST's unique capability for precise, well-resolved observations of low-surface-brightness structures next to bright objects, so it is a high priority to address outstanding questions before the demise of HST.

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