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Is there Evidence for Flat Cores in the Halos of Dwarf Galaxies?: The Case of NGC 3109 and NGC 6822
Octavio Valenzuela, George Rhee, Anatoly Klypin +4
Two well studied dwarf galaxies -- NGC 3109 and NGC 6822 -- present some of the strongest observational support for a flat core at the center of galactic dark matter (DM) halos. We…
The rotation curves of dwarf galaxies: a problem for Cold Dark Matter?
George Rhee, Octavio Valenzuela, Anatoly Klypin +2
We address the issue of accuracy in recovering density profiles from observations of rotation curves of galaxies. We ``observe'' and analyze our models in much the same way as obse…
A Study of 3CR Radio Galaxies from z = 0.15 to 0.65. I. Evidence for an Evolutionary Relationship Between Quasars and Radio Galaxies
Michael Harvanek, E. Ellingson, John T. Stocke
Deep optical images have been gathered for a nearly complete sample of radio galaxies from the Revised 3rd Cambridge (3CR) Catalog in the redshift range 0.15 < z < 0.65. Total and…
The ESO Nearby Abell Cluster Survey: Kinematics of Galaxies in Clusters
A. Biviano, A. Mazure, C. Adami +4
We summarize several results based on the velocity data-set for cluster galaxies provided by ENACS (the ESO Nearby Abell Cluster Survey). We describe the distribution of velocity d…
The Fundamental Plane of clusters of galaxies
C. Adami, A. Mazure, A. Biviano +2
We have used the ESO Nearby Abell Cluster Survey (ENACS) in combination with the Cosmos Galaxy Catalogue, to investigate the existence of a Fundamental Plane (FP) for rich clusters…
Improved Parameters and New Lensed Features for Q0957+561 from WFPC2 Imaging
Gary Bernstein, Philippe Fischer, J. Anthony Tyson +1
New HST WFPC2 observations of the lensed double QSO 0957+561 will allow improved constraints on the lens mass distribution and hence will improve the derived value of H. We fir…