416 citations · 772 across the 21 of their papers we have counts for
3 papers · 2 filters
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…
Long term radio variability of AGN
T. Hovatta, M. Tornikoski, H. J. Lehto +7
A large number of AGN have been monitored for nearly 30 years at 22, 37 and 87 GHz in Metsähovi Radio Observatory. These data were combined with lower frequency 4.8, 8.0 and 14.5 G…
Mapping the three-body system - decay time and reversibility
H. J. Lehto, S. Kotiranta, M. J. Valtonen +3
In this paper we carry out a quantitative analysis of the three-body systems and map them as a function of decaying time and intial conguration, look at this problem as an example…