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M. Oguri (Princeton University)
The full image separation distribution from galaxy to cluster scales has begun to be measured by, e.g., the lens survey in the Sloan Digital Sky Survey. We present a halo model prediction of the image separation distribution of strong lenses, with particular emphasis on the subhalo population which has been ignored in previous studies, In our model, halos and subhalos are linked to central and satellite galaxies by adopting an universal scaling relation between masses of (sub-)halos and luminosities of galaxies. We find that 10%-20% of lenses should be caused by the subhalo population. In addition, our model allows one to compute fractions of lenses which lie in groups and clusters, and find them to be ~14% and ~4%, respectively: Nearly half of such lenses are expected to be produced by satellite galaxies, rather than central parts of halos. Furthermore, we study mass distributions of lensing halos and find that even at image separations of 3'' the deviation of lens mass distributions from isothermal profiles is large: At or beyond 3'' image separations are enhanced significantly by surrounding halos. While our model prediction agrees reasonably well with observed image separation distributions from galaxy to cluster scales, it should be confronted with more detailed image separation distributions which will be obtained in ongoing lens surveys.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.