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|Total magnitude, radius, colour indices, colour gradients and photometric type of galaxies|
We present a catalogue of aperture photometry of galaxies, in UBVRI,assembled from three different origins: (i) an update of the catalogueof Buta et al. (1995) (ii) published photometric profiles and (iii)aperture photometry performed on CCD images. We explored different setsof growth curves to fit these data: (i) The Sersic law, (ii) The net ofgrowth curves used for the preparation of the RC3 and (iii) A linearinterpolation between the de Vaucouleurs (r(1/4) ) and exponential laws.Finally we adopted the latter solution. Fitting these growth curves, wederive (1) the total magnitude, (2) the effective radius, (3) the colourindices and (4) gradients and (5) the photometric type of 5169 galaxies.The photometric type is defined to statistically match the revisedmorphologic type and parametrizes the shape of the growth curve. It iscoded from -9, for very concentrated galaxies, to +10, for diffusegalaxies. Based in part on observations collected at the Haute-ProvenceObservatory.
|New aperture photometry for 217 galaxies in the Virgo and Fornax clusters.|
We present photo electric multi-aperture photometry in UBVRI of 171 and46 galaxies in the Virgo and Fornax clusters, respectively. Many of thegalaxies have not been observed in at least one of these passbandsbefore. We discuss the reduction and transformation into the Cousinsphotometric system as well as the extinction coefficients obtainedbetween 1990 and 1993.
|Galaxy content of selected southern groups - Elliptical galaxies at low density|
The dependence of disk galaxy morphology on local surface density whichwas demonstrated by Dressler (1980) holds for the presently studiedlarge sample of galaxies, and a systematic misclassification of certainweak-dished galaxies as elliptical galaxies is noted on plate materialsimilar to the Southern Sky Survey. Employing only the classificationsmade from sky-limited, large scale plates, the dependence of ellipticalfraction on local density is found to be very weak. The groups sampledall include a bright, elliptical-like galaxy, and the density ofelliptical galaxies in the field is lower than in these groups. Acombination of these results with those of Wirth and Gallagher (1980)concerning the dwarf population in groups and clusters indicates theoperation of a gas removal mechanism in the neighborhood of giantelliptical galaxies.
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