Mathematics – Logic
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000exun.conf..147l&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
Mathematics
Logic
Scientific paper
The astrophysics of extragalactic radio sources intersects with many of Riccardo Giacconi's central interests -- X-ray observations of the hot intergalactic gas in galaxies and clusters of galaxies, studies of active galaxies with the Hubble Space telescope, the cosmological evolution of active galaxies, and so on. A brief history of the contribution of studies of extragalactic radio sources to astrophysical cosmology is presented. New HST and infrared observations of a complete sample of 3CR radio galaxies are described. These are shown to be among the most massive galaxies at redshifts z > 1 and provide important clues to the formation of these massive galaxies and the nature of active galactic nuclei. The evolutionary history of these objects with cosmic epoch can now be related to the star-formation history of galaxies as a whole, thanks to observations with the Hubble Space Telescope.
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