Mathematics – Logic
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.1704d&link_type=abstract
American Astronomical Society, 192nd AAS Meeting, #17.04; Bulletin of the American Astronomical Society, Vol. 30, p.843
Mathematics
Logic
Scientific paper
Powerful classical double radio sources may be used to determine global cosmological parameters. Current results, obtained using a sample of radio galaxies with redshifts between zero and two, show that the universe has a low mean mass density. That is, a flat matter-dominated universe with Omega equal to one is ruled out with 97.5 percent confidence. The radio data and method used to obtain this result will be presented and discussed. In addition to using the sources to study cosmology, they can be used to study evolution of structure, including the merger rate of galaxies in the cores of clusters of galaxies as a function of redshift, and the evolution of the density, temperature, and pressure of the gas in clusters of galaxies with redshift. These results will also be discussed.
Daly Ruth A.
Guerra Erick J.
Wan Lin
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