Physics
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt........15w&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF WASHINGTON, 1995.Source: Dissertation Abstracts International, Volume: 56-12, Section: B, page: 68
Physics
1
Scientific paper
Weak gravitational lensing of QSOs by foreground galaxy clusters will change the statistical properties of QSOs behind cluster lenses. In particular, bright QSOs will be preferentially associated with the clusters while faint QSOs will tend to avoid the clusters. Two independent sets of QSOs and clusters were examined for the lensing signature. In both cases, QSOs seem to be associated with galaxy clusters in a way expected from lensing. These associations are statistically significant. The only aspect of observed associations that does not agree with predictions is the amplitude of associations. The latter is found to be substantially larger than predicted by the most optimistic lensing models. Several possible ways out of this conundrum are explored, but none are found satisfactory. Gravitational lensing is not the only physical effect that can lead to an excess or deficit of QSOs seen close in projection to galaxy clusters. Luminosity evolution of galaxies physically associated with QSOs, and dust in galaxy clusters would result in apparent excess and deficit, respectively, of QSOs seen in the directions of clusters. Since these effects need to be considered to disentangle them from the effects of lensing, I give a brief summary of the present state of knowledge in these two fields. I also show that the observed deficit of faint QSOs behind poor galaxy clusters found by Boyle et al. (1988) may not be due to dust obscuration, as is claimed by the authors, but due to weak gravitational lensing. Prospects for the future, especially with respect to the upcoming Sloan Digital Sky Survey, are briefly outlined in the last Chapter.
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