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astro-ph2008★ 416 cited
A massive binary black-hole system in OJ287 and a test of general relativity
M. J. Valtonen, H. J. Lehto, K. Nilsson +23
Tests of Einstein's general theory of relativity have mostly been carried out in weak gravitational fields where the space-time curvature effects are first-order deviations from Ne…
astro-ph2008★ 7 cited
Quasar Host Galaxies in the FORS Deep Field
C. Villforth, J. Heidt, K. Nilsson
(abriged)In this paper we study different properties of quasars and their host galaxies at high redshifts up to z~3.4. We compare our results to those of other authors and discuss…