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High redshift AGNs from the 1Jy catalogue and the magnification bias

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arxiv astro-ph/9505007 v1 pith:IE56CQ6D submitted 1995-05-02 astro-ph

High redshift AGNs from the 1Jy catalogue and the magnification bias

classification astro-ph
keywords cataloguebiasmagnificationredshiftscaleagnsamplitudeapprox
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We have found a statistically significant (99.1 \%) excess of red ($O-E>2$) galaxies with photographic magnitudes $E<19.5$, $O< 21$ taken from the APM Sky Catalogue around $z \sim 1$ radiosources from the 1Jy catalogue. The amplitude, scale and dependence on galaxy colours of the observed overdensity are consistent with its being a result of the magnification bias caused by the weak gravitational lensing of large scale structures at redshift $z \approx 0.2-0.4$ and are hardly explained by other causes, as obscuration by dust.

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