Results 251 to 260 of about 18,580 (285)
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Formation and Evolution of Galaxies
Transactions of the International Astronomical Union, 1988At the beginning of this review period a number of arguments were put forward against the neutrino model which became popular in 1980-1983: too high a rate of the structure evolution at the non-linear stage and the same difficulty in the galaxy formation.
A. A. Klypin +2 more
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The Evolution of the Star Formation Rate in Galaxies
Astrophysics and Space Science, 2001The aim of this work is to provide clues for the understanding of the star formation history of the universe. We study the process of star formation in galactic objects in hierarchical clustering scenarios using hydrodynamical cosmological simulations of standard Cold Dark Matter Universe. We estimate the specific star formation rate (sSFR) of galactic
SofÍa Alejandra Cora +4 more
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Chemical evolution in simulations of galaxy formation
Astrophysics and Space Science, 2002We developed a new algorithm to implement detailed chemical evolution in SPH models of galaxy formation. Delayed gas restitution and different production timescales for different elements are taken into account, with minor computational effort. The algorithm is especially conceived for SPH simulations with large numbers of particles, and for parallel ...
Portinari,L, CARRARO, GIOVANNI, Lia,C
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Galaxy formation and evolution
Physica Scripta, 1991The presence of high z quasars and radio galaxies tells us that galaxy formation began at z greater than 5, but leaves unanswered the question of when the bulk of galaxies formed. Recent near infrared number counts of galaxies strongly favor a cosmological geometry with q(sub 0) = 0.5 and lambda = 0.
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Galaxy Formation and Evolution
2009Major steps in our knowledge of high redshift galaxies and quasars were made possible by the synergy between the Hubble Space Telescope (HST) and 8–10 m class optical-near infrared ground-based telescopes. The galaxy samples were built from very deep, pencil-beam surveys with the HST and deep, wider area surveys undertaken with ground-based facilities.
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Formation and evolution of elliptical galaxies
Monthly Notices of the Royal Astronomical Society, 2002We address the problem of the formation and evolution of elliptical galaxies (from dwarf to normal/giant systems). In particular, by means of N-body-tree–SPH simulations, incorporating cooling, star formation, energy feedback and chemical evolution, we intend to explore whether the formation of elliptical galaxies from the monolithic collapse of ...
CHIOSI, CESARE, CARRARO, GIOVANNI
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Star Formation and Evolution of Galaxies
AIP Conference Proceedings, 2008We discuss how the star formation influences the evolution of galaxies. Processes in the ISM combine the gravitational instability with hydrodynamical instabilities triggering formation of stars. Various feedback processes operating in the star forming regions such as stellar winds, ionising radiation, and supernova explosions produce bubbles of hot ...
Jan Palouš +4 more
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The Formation & Evolution of Galaxies
Daedalus, 2014Weighing in at 1042 kilograms and measuring 1021 meters across, galaxies are perhaps the most awe-inspiring objects known to mankind. They are also the only places in an otherwise dark and unforgiving universe where stars and planets are able to form. In the past five to ten years we have made enormous progress in understanding when galaxies came into
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Physical Models of Galaxy Formation in a Cosmological Framework
Annual Review of Astronomy and Astrophysics, 2015Rachel S Somerville, Romeel Dave
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