AAS 205th Meeting, 9-13 January 2005
Session 28 Lensing: Micro, MACHO, Strong, Weak and Wide
Poster, Monday, January 10, 2005, 9:20am-6:30pm, Exhibit Hall

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[28.14] Angular Galaxy-QSO Cross-correlations on degree scales with 2dF QSOs

J. G. Nollenberg (University of St. Thomas), L. L. R. Williams (University of Minnesota)

There has been a long-standing order of magnitude discrepancy between the amplitudes of modeled and observed Galaxy-QSO angular cross-correlations that are generated by large scale structure on >30' scales. A number of explanations have been invoked to explain the discrepancy, including biases internal to respective galaxy and QSO catalogues, and patches of dust residing either in the Galaxy or in external galaxy clusters. The measurements of the cross-correlations themselves are often hampered to some degree by the generally small size of individual QSO samples. We observe anti-correlations between APM galaxies and a large sample of involving faint ~20k 2dF QSOs on scales >30', as expected from magnification bias models based on the apparent brightness of the QSO sample. These anti-correlations can not be explained by Galactic dust and our comparison of results from similar studies serves to strengthen the case for magnification bias as the source of the galaxy-QSO associations, though the reason for the model/observation discrepancy is still unknown.

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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.