Galaxies and clusters around and in front of radio sources

Details Galaxies and clusters around and in front of radio sources Galaxies and clusters around and in front of radio sources

1998-02-11

arxiv.org/abs/astro-ph/9802139v1

Astronomy and Astrophysics

Astrophysics

10 pages in LaTeX, uses knawproc.cls, 2 postscript figures. To appear in proceedings of `The most distant radio galaxies', Ams

Scientific paper

Some recent work on radio source fields at z~0.7 and z~4 is discussed. At z~0.7 we find that radio-loud quasars are typically found in moderately rich environments independent of radio luminosity, consistent with previous results at z~0.5. In the field of the z=4.41 radio galaxy 6C0140+326 we find several candidate z>4 galaxies using the Lyman-break technique, two of which have detectable UV absorption features. In two z>4 radio galaxies, we find evidence for gravitational lensing affecting the fluxes by a few tens of percent, although we cannot rule out unusual lensing events which have larger magnifications associated with them. A simple calculation suggests lensing of z>4 radio sources should be very common.

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