Publications (12)
The Nature of the Activity in Hickson Compact Groups of Galaxies
Roger Coziol, André L. B. Ribeiro, Reinaldo R. de Carvalho +1
We present the results of the spectral classification of the 82 brightest galaxies in a sample of 17 compact groups. We verify that the AGNs are preferentially located in the most…
The Evolution of Galaxies in Compact Groups
Roger Coziol, Reinaldo R. de Carvalho, Hugo V. Capelato +1
We present the analysis of the spectra of 62 galaxies in 15 compact groups. The galaxies were classified in four activity classes: galaxies without emission, starburst nucleus gala…
Simulations of collision and sloshing in the galaxy group NGC 5098/5096
Richards P. Albuquerque, Gastão B. Lima Neto, Rubens E. G. Machado +2
The study of galaxy groups is essential to understanding the evolutionary history of large-scale structures in the Universe. These dense environments have a significant impact on g…
The Radial Acceleration Relation in Galaxies and Clusters from a Two-Component, Virial-Motivated Framework
Christine C. Dantas, Andre L. B. Ribeiro, Hugo V. Capelato
We present a comparative analysis of acceleration data for gravitational systems drawn from multiple observational sources, including: (i) early-type galaxies (ETGs) (Lelli et al.…
The two-component virial theorem and the acceleration-discrepancy relation
Christine C. Dantas, Andre L. B. Ribeiro, Hugo V. Capelato
We revisit the "two-component virial theorem" (2VT) in the light of recent theoretical and observational results related to the "dark matter"(DM) problem. This modification of the…
The Two-Component Virial Theorem and the Physical Properties of Stellar Systems
Christine C. Dantas, Andre L. B. Ribeiro, Hugo V. Capelato +1
Motivated by present indirect evidences that galaxies are surrounded by dark matter halos, we investigate whether their physical properties can be described by a formulation of the…
The structure and dynamics of the AC114 galaxy cluster revisited
Dominique Proust, Irina Yegorova, Ivo Saviane +4
We present a dynamical analysis of the galaxy cluster AC114 based on a catalogue of 524 velocities. Of these, 169 (32%) are newly obtained at ESO (Chile) with the VLT and the VIMOS…
New measurements of radial velocities in clusters of galaxies -- V
Dominique Proust, Hugo V. Capelato, Gastao B. Lima Neto +1
As a part of our galaxy-cluster redshift survey, we present a set of 80 new velocities in the 4 clusters Abell 376, Abell 970, Abell 1356, and Abell 2244, obtained at Haute-Provenc…
Dissipationless Collapse of Spherical Protogalaxies and the Fundamental Plane
Christine C. Dantas, Hugo V. Capelato, Reinaldo R. de Carvalho +1
Following on from the numerical work of Capelato, de Carvalho & Carlberg (1995, 1997), where dissipationless merger simulations were shown to reproduce the "Fundamental Plane" (FP)…
Weak lensing and spectroscopic analysis of the nearby dissociative merging galaxy cluster Abell 3376
Rogério Monteiro-Oliveira, Gastão B. Lima Neto, Eduardo S. Cypriano +5
The galaxy cluster Abell~3376 is a nearby (z=0.046) dissociative merging cluster surrounded by two prominent radio relics and showing an X-ray comet-like morphology. The merger sys…
Evidence of Substructure in the Cluster of Galaxies A3558
Christine C. Dantas, Reinaldo R. de Carvalho, Hugo V. Capelato +1
We investigate the dynamical properties of the cluster of galaxies A3558 (Shapley 8). Studying a region of one square degree ( 3 Mpc) centered on the cluster cD galaxy, w…
"Fundamental-Plane"-Like Relations From Collisionless Stellar Dynamics: A Comparison of Mergers and Collapses
Christine C. Dantas, Hugo V. Capelato, Andre L. B. Ribeiro +1
We present a new set of dissipationless N-body simulations aiming to better understand the pure dynamical aspects of the ``Fundamental Plane'' (FP) of elliptical galaxies. We have…