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13 papers · 1 filter
Cold Gas at High Redshift
Colin A. Norman, Robert Braun
We discuss the current observational and theoretical issues concerning cold gas at high redshift and present simulations showing how a number of observational issues can be resolve…
What is 3C 324?
Mark Dickinson, Arjun Dey, Hyron Spinrad
We report ground based and HST observations of the z=1.206 radio galaxy 3C 324, a prototypical example of the radio-optical ``alignment effect.'' While infrared images shows a simp…
Dynamo driven accretion discs and dwarf nova eruptions
P. J. Armitage, M. Livio, J. E. Pringle
We explore the consequences of a magnetic dynamo origin for the viscosity in accretion discs, for the structure and evolution of discs in dwarf nova systems. We propose that the ra…
On the Formation and Evolution of Common Envelope Systems
Frederic A. Rasio, Mario Livio
We discuss the formation of a common envelope system following dynamically unstable mass transfer in a close binary, and the subsequent dynamical evolution and final fate of the en…
Lensing by Distant Clusters: HST Observations of Weak Shear in the Field of 3C324
Ian Smail, Mark Dickinson
We present the detection of weak gravitational lensing in the field of the radio galaxy 3C324 (z=1.206) using deep HST imaging. ~From an analysis of the shapes of faint R=24.5-27.5…
Determination of the Hubble constant from observations of Cepheid variables in the galaxy M96
N. R. Tanvir, T. Shanks, H. C. Ferguson +1
New Hubble Space Telescope observations of Cepheid variable stars in the nearby galaxy M96 give a distance to the host galaxy group, Leo-I, of 11.6+/-0.8 Mpc. This value, used in c…