A Search for Galaxy Clusters in the Fields of Bright Quasars

Details A Search for Galaxy Clusters in the Fields of Bright Quasars A Search for Galaxy Clusters in the Fields of Bright Quasars

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...20114604w&link_type=abstract

American Astronomical Society Meeting 201, #146.04; Bulletin of the American Astronomical Society, Vol. 35, p.572

Astronomy and Astrophysics

Astronomy

Scientific paper

We examine evidence for gravitational lensing of quasi-stellar objects due to an over density of foreground galaxy clusters.
Studies of bright quasars have shown correlation between these background sources and foreground galaxies (Norman and Impey 2001 and references within). This suggests that these quasars appear intrinsically brighter as a result of their location behind large mass structures. Further studies (Fort et. Al., 1995) have demonstrated that there exists weak lensing of distant galaxies in the fields of some quasars. In order to investigate this weak lensing generally, more information about the mass structures themselves is needed.
We examine several quasar fields, in which the quasars have redshifts of 0.7 < z < 2.5, in 4 SDSS filters (ugri) with the 1.5m telescope at CTIO. We will determine the redshifts of galaxies in these fields in order to look for associated foreground clusters. As photometric redshifts are much less time consuming to obtain than spectroscopic redshifts, they are a good alternate means for initial determination of the presence of structures and thus a good indicator as to whether or not more difficult to obtain spectroscopic data should be pursed.
This research was supported in part by the NSF Cerro Tololo Inter-American Observatory Research Experiences for Undergraduates.

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