Space VLBI: Past, present and future, and connections to gamma-ray astronomy

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Active And Peculiar Galaxies And Related Systems, Gamma-Ray Sources, Gamma-Ray Bursts, Astrometric And Interferometric Instruments

Scientific paper

The rapid time-variability observed at gamma-ray energies places strong constraints on the size of the emitting regions in active galactic nuclei (AGN), but the best imaging resolution remains at the other end of the electro-magnetic spectrum. Very Long Baseline Interferometry (VLBI) enables sub-parsec-scale resolution imaging of AGN, and the addition of an orbiting telescope to existing ground arrays-space VLBI-is likely before the end of the decade to have achieved 25 micro-arcsecond imaging capability. Results from the on-going VLBI Space Observatory Program (VSOP) mission are presented, and plans are described for a next generation mission which, with a possible launch in 2008, will have good overlap with GLAST. .

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