[148.11] A Search for Wide Separation Lensed QSOs

AAS 205th Meeting, 9-13 January 2005
Session 148 Large Scale Structure
Poster, Thursday, January 13, 2005, 9:20am-4:00pm, Exhibit Hall

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[148.11] A Search for Wide Separation Lensed QSOs

A. R. Marble, C. D. Impey (Univ. of Arizona), L. Miller, L. Clewley, E. Edmondson, A. M. Lopes (Oxford University)

Gravitationally lensed QSOs with image separations greater than 7 arcseconds require the lensing mass of a cluster of galaxies. Thus, the statistics of these rare objects probe the abundance of the most massive collapsed structures in the Universe at z<3, complementing WMAP measurements of anisotropies in the cosmic microwave background at z~1000. For 25 years, the largest known separation between gravitationally lensed QSO images has been 6.3 arcseconds. The recent discovery of a quadruple lensed QSO in SDSS with a maximum separation of 14.6 arcseconds motivates our ongoing survey for similar objects.

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