Results 271 to 280 of about 18,841 (318)
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Evolution of Clusters of Galaxies
Publications of the Astronomical Society of Japan, 1993Abstract We have investigated the evolution of clusters of galaxies using direct N-body simulations in which each galaxy is modeled by many particles. We found that the positive correlation between the masses and the distances of galaxies from the center of a cluster develops as the result of perturbations due to close encounters with ...
Yoko Funato +2 more
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Chemical Evolution of Galaxies
Annual Review of Astronomy and Astrophysics, 1976The various nucleosynthetic processes needed to account for the formation of the different nuclear species have been described in the previous chapters as well as the location of these nucleosynthetic events. At the beginning of this monograph, the evolution of the matter which constitutes the celestial bodies such as planets, stars and galaxies was ...
Audouze, J., Tinsley, B.M.
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Chemical Evolution of the Galaxy
Annual Review of Astronomy and Astrophysics, 1991Since the discovery of the cosmic microwave background ( 1 84), it is gen erally assumed that the universe originated from a hot big bang (78). Detailed nucleosynthesis calculations based on the hot big bang model (e.g. 4, 1 82, 221 ) showed that no element heavier than 9Be could have been synthesized primordially with an abundance exceeding 101 4 by ...
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Astrophysics and Space Science, 2003
The galaxy populations in present-day clusters are distinctly different from those of the field, indicating that environment plays a strong role in galaxy evolution. This review discusses some of the recent observations of moderate to high redshift clusters.
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The galaxy populations in present-day clusters are distinctly different from those of the field, indicating that environment plays a strong role in galaxy evolution. This review discusses some of the recent observations of moderate to high redshift clusters.
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Publications of the Astronomical Society of the Pacific, 1959
spiral structure is rather more open. In Sc nebulae the nucleus is very small, becoming quite inconspicuous in type Sc+. The spiral arms are very loosely wound and have a patchy structure due to the presence of supergiant stars and emission nebulae.
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spiral structure is rather more open. In Sc nebulae the nucleus is very small, becoming quite inconspicuous in type Sc+. The spiral arms are very loosely wound and have a patchy structure due to the presence of supergiant stars and emission nebulae.
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GRB Host Galaxies and Galaxy Evolution
EAS Publications Series, 2007Galaxy properties in general and properties of host galaxies of gamma-ray bursts (GRBs) in particular are investigated, using N -body/Eulerian hydrodynamic simulations and the stellar population synthesis model, Starburst99 . We identify simulated galaxies that have optical star formation rate and SFR -to-luminosity ratio similar
S. Courty +2 more
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BARRED GALAXIES AND GALAXY EVOLUTION
2007We know from near-infrared imaging that bars are present in more than three quarters of local disk galaxies. Several studies have recently led to the con- clusion that the fraction, as well as the properties, of bars in galaxies have not changed much from a redshift of about unity to the present day.
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1975
The methods by which the masses and mass-to light ratios of galaxies are determined from the velocity dispersions of stars and from dynamical studies of clusters of galaxies are outlined. It is concluded that while small clusters give no evidence for “missing mass” there is a discrepancy of about a factor of 5 in the case of large clusters.
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The methods by which the masses and mass-to light ratios of galaxies are determined from the velocity dispersions of stars and from dynamical studies of clusters of galaxies are outlined. It is concluded that while small clusters give no evidence for “missing mass” there is a discrepancy of about a factor of 5 in the case of large clusters.
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1976
Galaxies come in a wide variety of shapes and sizes. Until now, it has not really mattered for the purposes of this book just how galaxies differ from one another — we have been primarily concerned to account for their existence, and have considered them as ‘test particles’ which enable us to observe the expansion of the Universe. But if we are to find
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Galaxies come in a wide variety of shapes and sizes. Until now, it has not really mattered for the purposes of this book just how galaxies differ from one another — we have been primarily concerned to account for their existence, and have considered them as ‘test particles’ which enable us to observe the expansion of the Universe. But if we are to find
openaire +1 more source