Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-09-21
Astronomy and Astrophysics
Astrophysics
19 pages, and 19 figures, Contribution STSCI Conference Proceeding ``The Dark Universe: Matter, Energy, and Gravity''
Scientific paper
FRIIb radio galaxies provide a tool to determine the coordinate distance to sources out to redshifts of two. The coordinate distance depends on the present values of global cosmological parameters, quintessence, and the equation of state of quintessence, and provides one of the cleanest determinations of global cosmological parameters because it does not depend on the clustering properties of any mass-energy components. The modified standard candle method (using type Ia supernove) of determining the coordinate distance is compared in detail with the modified standard yardstick method (using FRIIb radio galaxies); the methods are found to be complementary. The most significant difference between the methods is that the radio galaxy method is completely independent of the local distance scale and the properties of local sources, while the supernovae method is very closely tied to the local distance scale and the properties of local sources. FRIIb radio galaxies provide one of the very few reliable probes of the coordinate distance to sources with redshifts out to two. The method indicates that the current value of the density parameter in non-relativistic matter must be low irrespective of whether the universe is spatially flat, and of whether a significant cosmological constant or quintessence pervades the universe at the present epoch. FRIIb radio galaxies indicate that the universe is currently accelerating in its expansion if the primary components of the universe at the present epoch are non-relativistic matter and quintessence, and the universe is spatially flat.
Daly Ruth A.
Guerra Erick J.
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