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VII/159 Catalogue of galaxies towards the Coma Supercluster (Slezak+ 1988)
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-r--r--r-- 1 cats archive 492830 Jan 23 1993 catalog Beginning of ReadMe :VII/159 Catalogue of galaxies towards the Coma Supercluster (Slezak+ 1988)
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Study of a field in the Coma Supercluster. I. Automated galaxies count
Slezak E., Mars G., Bijaoui A., Balkowski C., Fontanelli P.
<Astron. Astrophys. Suppl. Ser. 74, 83 (1988)>
=1988A&AS...74...83S
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ADC_Keywords: Clusters, galaxy ;
Keywords: Coma Supercluster - image processing in astronomy - galaxy count -
Schmidt plate analysis
Description: (Summary of the paper)
The existence of a filament of galaxies was shown by Fontanelli
(1984) in the Coma cluster region. This paper concerns the study of
a IIIaJ Palomar Schmidt plate of the Eastern end of this filament.
We have developed a real time reduction technique, quite similar to
that used for the COSMOS machine and performed, in real time, an
image segmentation. The galaxy selection was made using a classical
Bayesian classification based on the diagram of the integrated
density versus the area. All the non-stellar objects were thus
identified using the PDS and a morphological type was attributed
to the galaxies. Our catalogue gives coordinates, magnitudes
(derived from the Zwicky et al. (1961-68) and Nilson (1973)
catalogues), area in pixels, and morphological types for 7582
galaxies. A histogram of all the galaxy magnitudes shows that the
catalogue is apparently complete down to about the 19th magnitude.
The asymmetry in the distribution of the bright objects between the
North-West and the South-East part of the plate found by Fontanelli
(1984) is also present for the fainter objects of our catalogue. We
have identified galaxy condensations using an image segmentation on
the galaxy density map. The parameters, position, axis, and
orientation of these condensations have been estimated.