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On the efficiency of evolutionary fuzzy clustering
(SPRINGER, 2009)
This paper tackles the problem of showing that evolutionary algorithms for fuzzy clustering can be more efficient than systematic (i.e. repetitive) approaches when the number of clusters in a data set is unknown. To do so, ...
The clusters Abell 222 and Abell 223: a multi-wavelength view
(EDP SCIENCES S A, 2010)
Context. The Abell 222 and 223 clusters are located at an average redshift z similar to 0.21 and are separated by 0.26 deg. Signatures of mergers have been previously found in these clusters, both in X-rays and at optical ...
Handbook of Research on Innovation and Clusters. Cases and policies.
The role of innovations and clusters has increasingly dominated local and regional development policies in recent decades. This authoritative and accessible Handbook considers important aspects of high-tech clusters, ...
Handbook of Research on Innovation and Clusters. Cases and policies.
The role of innovations and clusters has increasingly dominated local and regional development policies in recent decades. This authoritative and accessible Handbook considers important aspects of high-tech clusters, ...
New measurements of radial velocities in clusters of galaxies-V
(EDP SCIENCES S A, 2010)
As a part of our galaxy-cluster redshift survey, we present a set of 79 new velocities in the 4 clusters Abell 376, Abell 970, Abell 1356, and Abell 2244, obtained at Haute-Provence observatory. This set now completes our ...
Open clusters in the third galactic quadrant - II. The intermediate age open clusters NGC 2425 and NGC 2635
(EDP SCIENCES, 2006-01)
We analyse CCD broad band (UBV(RI)(C)) photometric data obtained in the fields of the poorly studied open clusters NGC 2425 and NGC 2635. Both clusters are found to be of intermediate age thus increasing the population of ...
Intra-cluster globular clusters around NGC 1399 in Fornax?
(EDP Sciences, 2008-01)
We investigate whether the globular clusters (GCs) in the recently published sample of GCs in the Fornax cluster by Bergond and coworkers are indeed intra-cluster objects. Methods. We combine their catalogue of radial ...
Spiral-like structure at the centre of nearby clusters of galaxies
(EDP SCIENCES S A, 2010)
Context. X-ray data analysis have found that fairly complex structures at cluster centres are more common than expected. Many of these structures have similar morphologies, which exhibit spiral-like substructure. Aims. It ...
Diagnostic tool to analyse colour-magnitude diagrams of poorly populated stellar concentrations
(WILEY-BLACKWELL, 2011)
The dynamical processes that lead to open cluster disruption cause its mass to decrease. To investigate such processes from the observational point of view, it is important to identify open cluster remnants (OCRs), which ...