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Heating of the IGM
Ue-Li Pen
Using the cosmic virial theorem, Press-Schechter analysis and numerical simulations, we compute the expected X-ray background (XRB) from the diffuse IGM with the clumping factor ex…
Constraining q_0 with Cluster Gas Mass Fractions: A Feasibility Study
K. Rines, W. Forman, U. Pen +2
As the largest gravitationally bound objects in the universe, clusters of galaxies may contain a fair sample of the baryonic mass fraction of the universe. Since the gas mass fract…
Topological Defects with Broken Scale Invariance
Ue-Li Pen
Defect models have recently been declared dead (Watson 1997), because they predict microwave background and matter fluctuations grossly out of line with what we see. In this talk w…
Ω_0 from the Apparent Evolution of Gas Fractions in Rich Clusters of Galaxies
Rebecca Danos, Ue-Li Pen
We apply a unique gas fraction estimator to published X-ray cluster properties and we compare the derived gas fractions of observed clusters to simulated ones. The observations are…