1998/02/11 by M. Lacy, Mark Lacy, Lacy, M.
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Radio Astronomy Observations and Technology #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9802139
10 pages in LaTeX, uses knawproc.cls, 2 postscript figures. To appear in proceedings of `The most distant radio galaxies', Amsterdam, 15-17th October 1997
arxiv created 1998/02/11 · openalex publication_date 1998/02/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.