HST ACS Observations of the Gravitational Lens B1608+656

Details HST ACS Observations of the Gravitational Lens B1608+656 HST ACS Observations of the Gravitational Lens B1608+656

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.2102s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #21.02; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

By measuring the relative time delays between the multiple images of the lensed source and modeling the lens potential of a strong gravitational lens system, one can obtain a value of the Hubble constant. B1608+656 is a quadruply imaged gravitational lens system with an extended source intensity distribution and two interacting galaxy lenses. This system is unique in that the three relative time delays between the four images were measured accurately with errors of only a few percent, and thus provides an opportunity to measure the Hubble constant with high precision. With an extended source intensity distribution, simultaneous determination of the source intensity and the lens potential distributions is needed. This system permits mapping of the total matter (luminous and dark) distribution of interacting galaxies for the first time. We have deep and high-resolution HST ACS observations of the system showing a full Einstein ring of the extended source and a dust lane through the lens galaxies. A comprehensive analysis that takes into account the extended source intensity distribution, interacting galaxy lenses and the presence of dust is underway. Preliminary results will be presented.

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