9 papers
A New Sample of Distant Compact Groups From DPOSS
A. Iovino, R. de Carvalho, R. Gal +4
We have identified eighty-four small, high density groups of galaxies out to z ~ 0.2 in a region of ~ 2000 square degrees around the north galactic pole using DPOSS (the Digitized…
Searches for Rare and New Types of Objects
S. G. Djorgovski, A. A. Mahabal, R. J. Brunner +4
Systematic exploration of the observable parameter space, covered by large digital sky surveys spanning a range of wavelengths, will be one of the primary modes of research with a…
Automated search for LSB galaxies
S. Sabatini, R. Scaramella, V. Testa +4
Low Surface Brightness Galaxies (LSBGs) today constitute the less known fraction of galaxies: their number density and their physical properties (e.g. luminosity, colour, dynamics)…
The Multiplicity Function of groups of galaxies from CRoNaRio catalogues
E. De Filippis, G. Longo, S. Andreon +4
The projected multiplicity function of galaxies gives (per square degree) the density of galaxy aggregates formed by N members. We use the CRoNaRio matched catalogues to derive the…
An automatic procedure to extract galaxy clusters from CRoNaRio catalogs
E. Puddu, S. Andreon, G. Longo +6
We present preliminary results of a simple peak finding algorithm applied to catalogues of galaxies, extracted from the Second Palomar Sky Survey in the framework of the CRoNaRio p…
Quasar-Marked Protoclusters and Biased Galaxy Formation
S. G. Djorgovski, S. C. Odewahn, R. R. Gal +2
We report on the current status of our search for protoclusters around quasars at z > 4. While the search is still very incomplete, clustered companion galaxies are found in virtua…