Results 211 to 220 of about 211,606 (245)
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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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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
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The Evolution of Galaxies in Clusters
Annual Review of Astronomy and Astrophysics, 1984Clusters of galaxies are laboratories for the study of galaxy evolution. Predictions of the effects of tidal stripping, merging, and accretion are compared to optical observations, particularly in connection with the formation of galaxies in rich clusters.
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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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A repeating fast radio burst source localized to a nearby spiral galaxy
Nature, 2020Benito Marcote +2 more
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