284 citations · 1.1k across the 27 of their papers we have counts for
8 papers · 1 filter
Optical Substructure and BCG Offsets of Sunyaev-Zel'dovich and X-ray Selected Galaxy Clusters
P. A. A. Lopes, M. Trevisan, T. F. Laganá +3
We used optical imaging and spectroscopic data to derive substructure estimates for local Universe () galaxy clusters from two different samples. The first was selected t…
Group galaxy number density profiles far out: is the 'one-halo' term NFW out to virial radii?
Marina Trevisan, Gary A. Mamon, Diego H. Stalder
While the density profiles (DPs) of CDM haloes obey the NFW law out to roughly one virial radius, , the structure of their outer parts is still poorly understood, s…
SPIDER IX - Classifying Galaxy Groups according to their Velocity Distribution
A. L. B. Ribeiro, A. C. Schilling, R. R. de Carvalho +4
We introduce a new method to study the velocity distribution of galaxy systems, the Hellinger Distance (HD) - designed for detecting departures from a Gaussian velocity distributio…
SPIDER VIII - Constraints on the Stellar Initial Mass Function of Early-type Galaxies from a Variety of Spectral Features
F. La Barbera, I. Ferreras, A. Vazdekis +5
We perform a spectroscopic study to constrain the stellar Initial Mass Function (IMF) by using a large sample of 24,781 early-type galaxies from the SDSS-based SPIDER survey. Clear…
Non-Gaussian velocity distributions - The effect on virial mass estimates of galaxy groups
Andre L. B. Ribeiro, Paulo A. A. Lopes, Marina Trevisan
We present a study of 9 galaxy groups with evidence for non-Gaussianity in their velocity distributions out to 4R200. This sample is taken from 57 groups selected from the 2PIGG ca…
Decision Tree Classifiers for Star/Galaxy Separation
E. C. Vasconcellos, R. R. de Carvalho, R. R. Gal +5
We study the star/galaxy classification efficiency of 13 different decision tree algorithms applied to photometric objects in the Sloan Digital Sky Survey Data Release Seven (SDSS…
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…
Galaxy distribution and evolution around a sample of 2dF groups
A. L. B. Ribeiro, M. Trevisan, P. A. A. Lopes +1
We study galaxy evolution and spatial patterns in the surroundings of a sample of 2dF groups. Our aim is to find evidence of galaxy evolution and clustering out to 10 times the vir…