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The Last Eight-Billion Years of Intergalactic SiIV Evolution
intergalactic medium – quasars absorption lines techniques spectroscopic intergalactic medium quasars absorption lines techniques spectroscopic
2010/11/10
We identified 24 Si IV absorption systems with z . 1 from a blind survey of 49 low-redshift
quasars with archival Hubble Space Telescope ultraviolet spectra. We relied solely on the char-
acteristic...
Evolution and Distribution of Magnetic Fields from AGNs in Galaxy Clusters. I. The Effect of Injection Energy and Redshift
galaxies active — galaxies clusters general — methods numerical — MHD — turbulence
2010/11/9
We present a series of cosmological magnetohydrodynamic (MHD) simulations that simultaneously follow the formation of a galaxy cluster and evolution of magnetic fields ejected by an Active Galactic Nu...
Low-ionization galaxies and evolution in a pilot survey up to z = 1
cosmology observations galaxies: evolution large scale structures evolution
2010/11/12
We present galaxy spectroscopic data on a pencil beam of 10.75′ × 7.5′ centered on the X-ray cluster RXJ0054.0-2823 at z = 0.29. We study the spectral evolution of galaxies from z = 1 down to the clus...
Abundance anomalies in pre-main-sequence stars: Stellar evolution models with mass loss
Diffusion — stars chemically peculiar — stars mass–loss — stars pre–main-sequence — stars evolution — stars
2010/11/12
Aims. The effects of atomic diffusion on internal and surface abundances of A and F pre–main-sequence stars with mass loss are studied in order to determine at what age the effects materialize, as wel...
The stellar evolution of Luminous Red Galaxies, and its dependence on colour, redshift, luminosity and modelling
galaxies evolution - cosmology observations - surveys
2010/11/15
We present a series of colour evolution models for Luminous Red Galaxies (LRGs) in the 7th spectroscopic data release of the Sloan Digital Sky Survey (SDSS), computed using the full-spectrum fitting c...
Galaxy stellar mass functions of different morphological types in clusters, and their evolution between z=0.8 and z=0
Galaxy stellar mass functions morphological types
2011/1/10
We present the galaxy stellar mass function (MF) and its evolution in clusters from z~0.8 to the current epoch, based on the WIde-field Nearby Galaxy-cluster Survey (WINGS) (0.04
Evolution of gaseous disk viscosity driven by supernova explosion. II. Structure and emissions from star-forming galaxies at high redshift
gaseous disk viscosity driven supernova explosion
2011/1/10
(Abridged) High redshift galaxies are undergoing intensive evolution of dynamical structure and morphologies. We incorporate the feedback into the dynamical equations through mass dropout and angular ...
The Early Evolution of Primordial Pair-Instability Supernovae
Primordial Pair-Instability Supernovae
2011/1/10
The observational signatures of the first cosmic explosions and their chemical imprint on second-generation stars both crucially depend on how heavy elements mix within the star at the earliest stages...
Chemical spots and their dynamical evolution on HgMn stars
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/6
Our recent studies of late B-type stars with HgMn peculiarity revealed for the first time the presence of fast dynamical evolution of chemical spots on their surfaces. These observations suggest a hit...
Evolution of massive Be and Oe stars at low metallicity towards the Long Gamma Ray bursts\footnote{Based on ESO runs 069.D-0275(A), 072.D-0245(A) and (C).}
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/6
Several studies have shown recently that at low metallicity B-type stars rotate faster than in environments of high metallicity. This is a typical case in the SMC. As a consequence, it is expected tha...
Post-flare evolution of AR 10923 with Hinode/XRT
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/5
Flares are dynamic events which involve rapid changes in coronal magnetic topology end energy release. Even if they may be localized phenomena, the magnetic disturbance at their origin may propagate a...
The evolution of massive binaries in a dense stellar cluster environment
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/5
Massive stars are among the most important objects in the Universe and many (most?) of them are formed in binaries. A selection of observational and theoretical facts that illustrate the importance of...
Review about populations of Be stars: stellar evolution of extreme stars
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/6
Among the emission-line stars, the classical Be stars known for their extreme properties are remarkable. The Be stars are B-type main sequence stars that have displayed at least once in their life emi...
Observational approach to the chemical evolution of high-mass binaries
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/6
The complexity of composite spectra of close binaries makes the study of the individual stellar spectra extremely difficult. For this reason there exists very little information on the chemical compos...
Signatures of binary evolution processes in massive stars
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/5
Before binary components interact, they evolve as single stars do. We therefore first critically discuss massive single star processes which affect their evolution, stellar wind mass loss and rotation...