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VIRTUAL OBSERVATORY: "Plate Content Digitization, Archive Mining and Image Sequence Processing"
April 27-30, 2005
Auspices of COST Actoin 283: "Computational and information infrastructure in the Astronomical DataGrid"
Sofia, Bulgaria

Organizers
Milcho Tsvetkov, Bulgarian Academy of Sciences, Space Research Institute, and Valeri Golev, Sofia University, Department of Astronomy

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Cluster analysis of faint galaxies in Hercules void (1600+18)
by
Georgi Petrov
Institute of Astronomy, Bulgarian Academy of Sciences
Coauthors: Josef Fried (Max Plank Institute of Astronomy, Heidelberg, Germany), Aleksei Kniazev (European South Observatory, Garching, Germany)

Over 1800 faint galaxies, detected in 1 sqr. degree field, centered at 16h00m + 18deg00m (1950) - Hercules void were analysed using cluster analysis technique. The data base contains coordinates, large diameters, axis ratios, position angles, magnitudes, effective radii and surface brightnes at 50to 25 mag/sqr.sec isophote. Different methods of separation and grouping were discussed. Preliminary classification of the objects, based on concentration index is presented. Groups of primeval and low surface brightness galaxies were defined.

Date received: March 14, 2005

Copyright © 2005 by the author(s). The author(s) of this document and the organizers of the conference have granted their consent to include this abstract in Atlas Conferences Inc. Document # capb-38.