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- W3100401088 abstract "We have studied the distribution of $B_J<20.5$ galaxies from the ROE/NRL COSMOS/UKST catalogue around two samples of $z>0.3$ QSOs with similar redshift distributions. The first sample is formed by 144 radio-loud QSOs from the Parkes Catalogue, and the other contains 167 optically selected QSOs extracted from the Large Bright Quasar Survey. It is found that there is a $approx 99.0%$ significance level excess of COSMOS/UKST galaxies around the PKS QSOs, whereas there is a marginal defect of galaxies around the LBQS QSOs. When the distribution of galaxies around both samples is compared, we found that there is an overdensity of galaxies around the PKS sample with respect to the LBQS sample anticorrelated with the distance from the QSOs at a $99.7%$ significance level. Although this result apparently agrees with the predictions of the double magnification bias, it is difficult to explain by gravitational lensing effects alone; dust in the foreground galaxies and selection effects in the detection of LBQS QSOs should be taken into account. It has been established that the lines of sight to PKS flat-spectrum QSOs go through significatively higher foreground galaxy densities than the directions to LBQS quasars, what may be partially related with the reported reddening of PKS QSOs." @default.
- W3100401088 created "2020-11-23" @default.
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- W3100401088 date "1997-03-01" @default.
- W3100401088 modified "2023-10-02" @default.
- W3100401088 title "Large‐Scale QSO‐Galaxy Correlations for Radio‐loud and Optically Selected QSO Samples" @default.
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- W3100401088 doi "https://doi.org/10.1086/303699" @default.
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