11 papers · 1 filter
Spectroscopic confirmation of clusters from the ESO imaging survey
M. Ramella, A. Biviano, W. Boschin +8
We measure redshifts for 67 galaxies in the field of six cluster candidates from the ESO Imaging Survey (EIS). The cluster candidates are selected in the EIS patches C and D among…
Confirming EIS Clusters. Multi-object Spectroscopy
A. Biviano, M. Ramella, W. Boschin +7
Using EFOSC2 at the 3.6m ESO telescope, we obtained redshifts for 68 galaxies in the field of six cluster candidates from the ESO Imaging Survey (EIS). The cluster candidates were…
Confirming EIS Clusters. Optical and Infrared Imaging
L. F. Olsen, H. E. Jorgensen, M. Scodeggio +6
Clusters of galaxies are important targets in observationally cosmology, as they can be used both to study the evolution of the galaxies themselves and to constrain cosmological pa…
The ESO Slice Project (ESP) Galaxy Redshift Survey. VII. The Redshift and Real-Space Correlation Functions
L. Guzzo, J. G. Bartlett, A. Cappi +17
We present analyses of the two-point correlation properties of the ESP galaxy redshift survey. From the redshift-space correlation function xi(s), we see positive clustering out to…
The ESO Slice Project (ESP) galaxy redshift survey: VI Groups of Galaxies
M. Ramella, G. Zamorani, E. Zucca +17
In this paper we identify objectively and analyze groups of galaxies in the recently completed ESP survey. We find 231 groups above the number overdensity threshold delta(rho)/rho=…
Cluster identification via Voronoi tessellation
M. Ramella, M. Nonino, W. Boschin +1
We propose an automated method for detecting galaxy clusters in imaging surveys based on the Voronoi tessellation technique. It appears very promising, expecially for its capabilit…