Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000exun.conf..337m&link_type=abstract
EXPLORING THE UNIVERSE A Festschrift in Honor of R Giacconi . Held October 1997 in Rome, Italy. Edited by H Gursky (Naval Resear
Astronomy and Astrophysics
Astronomy
Scientific paper
The HST has become one of the most important instruments to investigate the physical nature of the optical counterparts to radio-jets. High-spatial and spectral resolution observations of a variety of sources has been carried-out. HST observations of the complete 3CR sample of radio sources has led to the discovery of several new optical counterparts to radio jets, more than doubling the sample of known objects. HST observations have revealed, for the first time at optical wavelengths, proper motions in the M87 jet, with doppler-boosted velocities, as high as 2.5c. Also relevant to the understanding of the physical properties of these jets are the numerous HST observations of the central regions of AGN. These include LINERS, Seyferts 1 and 2, as well as powerful radio sources. The HST results are in broad agreement with the unified theories for AGN. However, these results have also made important modifications to the basic theory, such as the need for additional sources of ionization (e.g., shocks) to explain the observed filamentary structure in the Narrow-Line Region.
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