72 citations · 543 across the 27 of their papers we have counts for
13 papers · 1 filter
An old quasar in a young dark energy-dominated universe?
A. Friaca, J. S. Alcaniz, J. A. S. Lima
Dark energy is the invisible fuel that seems to drive the current acceleration of the Universe. Its presence, which is inferred from an impressive convergence of high-quality obser…
On the Detectability of the SZ Effect of Massive Young Galaxies
Daniel Rosa-Gonzalez, Roberto Terlevich, Elena Terlevich +2
The Sunyaev-Zel'dovich (SZ) effect expected to be associated with massive star-formation activity produced during the formation of the most luminous bulges of normal galaxies is di…
Clues to the nature of damped Lyman alpha systems from chemical evolution models
Gustavo A. Lanfranchi, Amancio Friaca
The evolution of the metallicity of damped Lyman alpha systems (DLAs) is investigated in order to understand the nature of these systems. The observational data on chemical abundan…
Evolution of active galactic nuclei broad-line region clouds: low- and high-ionization lines
D. R. Goncalves, A. C. S. Friaca, V. Jatenco-Pereira
The formation of quasar broad-line region (BLR) clouds via thermal instability in the presence of Alfven heating has been discussed by Goncalves et al. (1993a, 1996). In particular…
Coupled spheroid and black-hole formation, and the multifrequency detectability of active galactic nuclei and submillimetre sources
E. N. Archibald, J. S. Dunlop, R. Jimenez +3
We use a simple model of spheroid formation to explore the relationship between the creation of stars and dust in a massive proto galaxy and the growth of its central black hole. T…
The cosmological evolution of colour gradients in spheroids
Amancio Friaca, Roberto Terlevich
The analysis of the four-colour maps of galaxies in the Hubble Deep Field has revealed in the sample of 0.4<z<1 early-type field galaxies the existence of ellipticals with a predom…
Does magnetic pressure affect the ICM dynamics?
Denise R. Goncalves, Amancio C. S. Friaca
A possible discrepancy found in the determination of mass from gravitational lensing data, and from X-rays observations, has been largely discussed in the latest years (for instanc…
Lyman alpha systems within hot galactic halos
Sueli M. Viegas, Amancio C. S. Friaca, Ruth Gruenwald
A hot gas halo is predicted by chemodynamical models during the early evolution of spheroidal galaxies. Cold condensations, arising from thermal instabilities in the hot gas, are e…
Lyman break galaxies as young spheroids
Amancio C. S. Friaca, Roberto J. Terlevich
We investigate the nature of Lyman break galaxies (LBGs) using a chemodynamical model for evolution of galaxies. Our models predict an early (the first Gyr) stage of intense star f…
Premature dismissal of high-redshift elliptical galaxies
Raul Jimenez, Amancio Friaca, James Dunlop +3
It has recently been argued that single-collapse high-redshift models for elliptical galaxy formation can be rejected because they predict large numbers of very red galaxies at int…
Magnetic Fields on the Dynamics of the ICM
D. R. Goncalves, A. C. S. Friaca
Could the discrepancies found in the determination of mass in clusters of galaxies, from gravitational lensing data and from X-rays observations, be consequence of the standard des…
Formation and evolution of elliptical galaxies and QSO activity
Amancio C. S. Friaca, Roberto J. Terlevich
We present the results of a numerical code that combines multi-zone chemical evolution with 1-D hydrodynamics to follow in detail the evolution and radial behaviour of gas and star…
Alfven heating in optical filaments in cooling flows
A. C. S. Friaca, D. R. Goncalves, L. C. Jafelice +2
One of the major problems concerning cooling flows is the nature of the mechanism powering the emission lines of the optical filaments seen in the inner regions of cooling flows. I…