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This review of the superluminal motion phenomenon in Active Galaxies takes a largely statistical approach. Predictions for the apparent velocity distribution under simple beaming models are presented and compared to the observations. The potential applications for tests of unification models and for cosmology (source counts, measurements of H0 and q0) are discussed. First results...
The unique 0.26 c stellar jets of SS 433 are reviewed, starting at the binary system, and then, using a natural separation by observing wavelength, following them out to successively larger scales over eight orders of magnitude. Recent work is emphasized in this review, and care is taken to provide up-to-date entry points into the extensive older literature on SS 433. This is an update of a similar...
Recent astronomical and technical highlights, current activities, and future plans of the International LOFAR Telescope (ILT) will be summarized. During URSI GASS 2014 the ILT will be calling for Cycle 3 proposals, which will have 20% of time awarded under fully Open Skies conditions, for a broad range of available observing modes, which will be summarized. The report will cover the new GPU correlator/beamformer,...
Construction of the Low Frequency Array (LOFAR) is nearly complete. It consists of 48 stations, mostly concentrated within the Netherlands, and spreading into Europe. Each station has 48 or 96 dipole antennas and antenna tiles, optimized for 30–240 MHz. LOFAR uses a combination of true time delay and phased-array techniques. Digital beam-forming gives the system agility and allows rapid repointing...
LOFAR is a new radio telescope with 40 stations in the Netherlands and a further 8 in Germany, France, Sweden and the UK. It operates in the 30–240 MHz frequency range using unique and innovative techniques, many of which will find their way in future telescopes such as the SKA. With the construction of LOFAR almost complete we look back at its design and construction as well as the ongoing commissioning...
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