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- National ObservatoryBR701 papers
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7 papers · 2 filters
The Voronoi Tessellation cluster finder in 2+1 dimensions
Marcelle Soares-Santos, Reinaldo R. de Carvalho, James Annis +6
We present a detailed description of the Voronoi Tessellation (VT) cluster finder algorithm in 2+1 dimensions, which improves on past implementations of this technique. The need fo…
Segregation Effects According to the Evolutionary Stage of Galaxy Groups
Andre L. B. Ribeiro, Paulo A. A. Lopes, Marina Trevisan
We study segregation phenomena in 57 groups selected from the 2PIGG catalog of galaxy groups. The sample corresponds to those systems located in areas of at least 80% redshift cove…
Coupled quintessence with a possible transient accelerating phase
F. E. M. Costa
We discuss some cosmological consequences of a general model of coupled quintessence in which the phenomenological coupling between the cold dark matter and dark energy is a functi…
SPIDER - IV. Optical and NIR color gradients in Early-type galaxies: New Insights into Correlations with Galaxy Properties
F. La Barbera, R. R. de Carvalho, I. G. de la Rosa +3
We present an analysis of stellar population gradients in 4,546 Early-Type Galaxies with photometry in along with optical spectroscopy. A new approach is described which…
Tracing The Sound Horizon Scale With Photometric Redshift Surveys
E. Sanchez, A. Carnero, J. Garcia-Bellido +6
We propose a new method for cosmological parameters extraction using the baryon acoustic oscillation scale as a standard ruler in deep galaxy surveys with photometric determination…
The chemical evolution of IC10
Jun Yin, Laura Magrini, Francesca Matteucci +3
Dwarf irregular galaxies are relatively simple unevolved objects where it is easy to test models of galactic chemical evolution. We attempt to determine the star formation and gas…