A Search for Wide Separation Lensed QSOs

Details A Search for Wide Separation Lensed QSOs A Search for Wide Separation Lensed QSOs

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20514811m&link_type=abstract

American Astronomical Society Meeting 205, #148.11; Bulletin of the American Astronomical Society, Vol. 36, p.1597

Statistics

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Scientific paper

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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