Physics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9219703.&link_type=abstract
Presented at the Extra-Galactic Radio Sources: From Beam to Jet, Paris, France, Jul. 1991; and at the VLBI Observation of Quasar
Physics
Active Galactic Nuclei, Data Reduction, Extragalactic Radio Sources, Imaging Techniques, Quasars, Very Long Base Interferometry, Accretion Disks, Mapping, Millimeter Waves, Telescopes
Scientific paper
Very long base interferometry (VLBI) observations at 100 GHz started as early as 1981, but 1988 was the first epoch aimed for full hybrid mapping. At the same time, a new data reduction technique was developed to fully handle the new data. Since 1989, three epoches have been observed, in March 1988, March 1989, and April 1990. These observations involved telescopes in Sweden, Japan, and the U.S. The epoch of 1990 also for the first time in VLBI included the SEST telescope in Chile, and the resolution in the north-south direction was drastically improved. Observations with VLBI at mm wavelength is currently the only possibility to make images of the cores of active galactic nuclei. Such observations can give us direct insight into the core areas on size scales less than the broad line region and close to that of the accretion disc.
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