Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....118..613n&link_type=abstract
The Astronomical Journal, Volume 118, Issue 2, pp. 613-624.
Astronomy and Astrophysics
Astronomy
11
Cosmology: Observations, Cosmology: Gravitational Lensing, Galaxies: Quasars: General
Scientific paper
Weak gravitational lensing by clusters and superclusters can change our perception of the distribution of bright background quasars through a phenomenon known as amplification bias. It has been suggested that this lensing will lead to an association of moderate redshift quasars (z~1.0-2.0) and foreground galaxies (z~0.2-0.3). We report on the analysis of a homogeneous sample of 32 CCD fields centered on quasars that are bright both at radio (S_5GHz>1 Jy) and optical (V<18.5) wavelengths, along with 11 control fields. These 69'x69' fields are a small subset of our larger survey of the fields around approximately 100 quasars and approximately 20 control fields. The quasars presented here are chosen to have the highest potential for evidence of this weak lensing effect. We find no evidence for the presence of rich galaxy clusters (Abell richness class=1) in the foreground of these fields. However, using a Spearman rank-order correlation test, we have detected a correlation between galaxy number density and angular distance from bright quasars on scales less than 30' with a significance of 99%. This angular correlation is consistent with the recent semianalytic models of Dolag & Bartelmann that incorporate nonlinear evolution of matter.
Impey Chris David
Norman Dara J.
No associations
LandOfFree
Quasar-Galaxy Correlations: a Search for Amplification Bias does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Quasar-Galaxy Correlations: a Search for Amplification Bias, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quasar-Galaxy Correlations: a Search for Amplification Bias will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1455708