Computer Science
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006cxo..prop.2200s&link_type=abstract
Chandra Proposal ID #08700238
Computer Science
Chandra Proposal Id #08700238
Scientific paper
We propose to observe four quasars lensed by intervening galaxies for a total of 55 ksec. Each quasar has four images. Comparison of the X-ray flux ratios with the corresponding optical ratios constrains the relative sizes of the two emitting regions. Comparison with predictions from smooth lens models constrains the lenses' dark matter content. There is growing evidence that the flux ratio ``anomalies'' -- the differences between the observed fluxes and those predicted by smooth models -- are yet larger in X-rays than in the optical. The implications are first, that the optical comes from a substantially larger region than predicted by Shakura-Sunyaev disks models, and second, that X-ray observations give a better handle on the dark matter content than optical observations.
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