214 citations · 1.5k across the 40 of their papers we have counts for
5 papers · 1 filter
Radio Galaxies and the Acceleration of the Universe Beyond a Redshift of One
Ruth A. Daly
Radio galaxies provide a means to determine the coordinate distance,the luminosity distance, the dimensionless luminosity distance, or the angular size distance to sources with red…
Constraints on the Cluster Environments and Hot Spot Magnetic Field Strengths of the Radio Sources 3C254 and 3C280
Megan Donahue, Ruth A. Daly, Donald J. Horner
We present new Chandra Observatory observations with archival HST and radio observations of 3C254, a radio quasara at z=0.734, and 3C280, a radio galaxy at z=0.996. We report the d…
Quintessence, Cosmology, and Fanaroff-Riley Type IIB Radio Galaxies
Ruth A. Daly, E. J. Guerra
Fanaroff-Riley type IIb (FR IIb) radio galaxies provide a modified standard yardstick that allows constraints to be placed on global cosmological parameters. A sample of 20 FR IIb…
Radio Galaxy Redshift-Angular Size Data Constraints on Dark Energy
Silviu Podariu, Ruth A. Daly, Matthew P. Mory +1
We use FRIIb radio galaxy redshift-angular size data to constrain cosmological parameters in a dark energy scalar field model. The derived constraints are consistent with but weake…
High-Redshift Radio Galaxies as a Cosmological Tool: Exploration of a Key Assumption and Comparison with Supernova Results
Ruth A. Daly, Matthew P. Mory, Erick J. Guerra
There are many different approaches to using observations to constrain or determine the global cosmological parameters that describe our universe. Methods that rely upon a determin…