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

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

1995-05-02

arxiv.org/abs/astro-ph/9505007v1

Astronomy and Astrophysics

Astrophysics

uuencoded file containing 3 ps files: the main text, a table and a figure. To appear in ApJ Letters

Scientific paper

10.1086/309605

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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