6 papers
The X-ray evolution of clusters of galaxies to z=0.9
L. R. Jones, H. Ebeling, C. Scharf +6
The evolution of the X-ray luminosity function of clusters of galaxies has been measured to z=0.9 using over 150 X-ray selected clusters discovered in the WARPS survey. We find no…
EFAR peculiar velocities and bulk motions
Matthew Colless, R. P. Saglia, David Burstein +3
The EFAR project has measured peculiar motions in two distant volumes of the universe using Fundamental Plane (FP) distances for 85 clusters with cz=6000-15000 km/s. The scatter in…
The Nearby Early-type Galaxies Survey (ENEAR): Project description and Some Preliminary Results
G. Wegner, L. N. da Costa, M. V. Alonso +5
The ENEAR project is an all-sky survey of nearby early-type galaxies. About 2200 new spectra and R-band images of over 1500 galaxies together with published data were assembled int…
Cluster Evolution in the Wide Angle ROSAT Pointed Survey (WARPS)
C. A. Scharf, L. R. Jones, E. Perlman +4
A new flux limited catalogue of low luminosity (Lx <= 10^44 erg/s) X-ray galaxy clusters and groups covering a redshift range of z~0.1 to z~0.7 has been produced from the WARPS pro…
The Quadruple Gravitational Lens PG1115+080: Time Delays and Models
P. L. Schechter, C. D. Bailyn, R. Barr +24
Optical photometry is presented for the quadruple gravitational lens PG1115+080. A preliminary reduction of data taken from November 1995 to June 1996 gives component ``C'' leading…
The WARPS survey for faint Clusters of Galaxies
L. R. Jones, C. A. Scharf, E. Perlman +3
The WARPS cluster survey is based on the ROSAT PSPC archive of pointed observations. It includes extended X-ray sources, detected with the Voronoi Tessellation and Percolation algo…