284 citations · 2.7k across the 55 of their papers we have counts for
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Exploration of Large Digital Sky Surveys
S. G. Djorgovski, R. J. Brunner, A. A. Mahabal +8
We review some of the scientific opportunities and technical challenges posed by the exploration of the large digital sky surveys, in the context of a Virtual Observatory (VO). The…
Luminosity function of clusters of galaxies
M. Paolillo, S. Andreon, G. Longo +5
The composite galaxy luminosity function (hereafter LF) of 39 Abell clusters of galaxies is derived by computing the statistical excess of galaxy counts in the cluster direction wi…
The Butcher-Oemler Effect in 295 Clusters: Strong Redshift Evolution and Cluster Richness Dependence
V. E. Margoniner, R. R. de Carvalho, R. R. Gal +1
We examine the Butcher-Oemler effect and its cluster richness dependence in the largest sample studied to date: 295 Abell clusters. We find a strong correlation between cluster ric…
Analysis of resonances in grand design spiral galaxies
Nelson Vera-Villamizar, Horacio Dottori, Ivanio Puerari +1
We have searched for corotations (CR) in three Southern grand design spiral galaxies: NGC 1365, NGC 1566 and NGC 2997. We have also introduced a method of quantifying errors in the…
The Palomar Abell Cluster Optical Survey I: Photometric Redshifts for 431 Abell Clusters
R. R. Gal, R. R de Carvalho, R. Brunner +2
This paper presents photometric redshifts for 431 Abell clusters imaged as part of the Palomar Abell Cluster Optical Survey (PACOS), of which 236 are new redshi fts. We have obtain…
The Relation Between Activity and Environment in Compact Groups of Galaxies
Roger Coziol, Angela Iovino, Reinaldo R. de Carvalho
We present the results of the classification of spectral activity types for 193 galaxies from a new sample of 49 compact groups of galaxies in the southern hemisphere (SCGs). This…
Radio Properties of z>4 Optically-Selected Quasars
Daniel Stern, S. G. Djorgovski, R. A. Perley +2
We report on two programs to address differential evolution between the radio-loud and radio-quiet quasar populations at high (z>4) redshift. Both programs entail studying the radi…
Photometric Properties of 47 Clusters of Galaxies: I. The Butcher-Oemler Effect
V. E. Margoniner, R. R. de Carvalho
We present gri CCD photometry of 44 Abell clusters and 4 cluster candidates. Twenty one clusters in our sample have spectroscopic redshifts. Fitting a relation between mean g, r an…