The CASTLES Imaging Survey of Gravitational Lenses

Details The CASTLES Imaging Survey of Gravitational Lenses The CASTLES Imaging Survey of Gravitational Lenses

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.8314p&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #83.14; Bulletin of the American Astronomical Society, Vol. 29, p.1348

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The CASTLES survey (Cfa-Arizona-(H)ST-Lens-Survey) is imaging most known small-separation gravitational lenses (or lens candidates), using the NICMOS camera (mostly H-band) and the WFPC2 (V and I band) on HST. To date nearly half of the IR imaging survey has been completed. The main goals are: (1) to search for lens galaxies where none have been directly detected so far; (2) obtain photometric redshift estimates (VIH) for the lenses where no spectroscopic redshifts exist; (3) study and model the lens galaxies in detail, in part to study the mass distribution within them, in part to identify ``simple" systems that may permit accurate time delay estimates for H_0; (3) measure the M/L evolution of the sample of lens galaxies with look-back time (to z ~ 1); (4) determine directly which fraction of sources are lensed by ellipticals vs. spirals. We will present the survey specifications and the images obtained so far.

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