Other
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8642u&link_type=abstract
HST Proposal ID #8642
Other
Hst Proposal Id #8642 Cosmology
Scientific paper
A short WFPC2 F702W snapshot image of the BL Lac object 1517+656 has revealed three surrounding arcs, subsequently confirmed by a longer NOT observation, making this a probable new Einstein ring. Deeper high-resolution imaging is required to determine unambiguously the nature of this intriguing source. We propose to obtain a deep STIS/CCD + F28X50LP image to map the detailed structure of the arcs, and WFPC2 F555W and F814W images to measure their colors. The STIS data will have the depth and resolution required for iterative back-mapping of the arcs, providing a unique determination of the mass distribution of the lens. The extreme narrowness of the arcs makes ground-based observations useless for this purpose. Combined with the WFPC2 data, we will have sufficient color information to constrain the photometric redshift and stellar population of each arc {impossible with the ground-based data because of the instability of the required deconvolution}, as well as of other galaxies detected in the field.
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