Introduction Gravitational Assessment of Baryonic Mass and Density in and near Galaxies Galactic Luminosity Data Gravitationally Derived Estimates of Baryonic Mass in the Universe Discussion Conclusions and Implications Author Contributions Funding Data Availability Statement Acknowledgments Conflicts of Interest Appe...
However, this population of galaxies is known to under-represent the most massive galaxies, which have rich dust content and/or old stellar populations. This raises the questions of the true abundance of massive galaxies and the star-formation-rate density in the early Universe. Although several ...
Systematic studies1,2,3,4 have revealed hundreds of ultra-compact dwarf galaxies (UCDs5) in the nearby Universe. With half-light radii rh of approximately 10–100 parsecs and stellar masses M* ≈ 106–108 solar masses, UCDs are among the densest known stellar systems6. Although sim...
experience, this second edition features an up-to-date view of basic phenomenology, a discussion of the structure of dark halos in galaxies, the dynamics of quasi-relaxed stellar systems and globular clusters, galaxies and gravitational lensing and an introduction to self-gravitating accretion disks....
the continuum, and strength of very high excitation lines up to Fe XXV and XXVI in several clusters (Mushotzky et al. 1978 and references therein).Independent evidence of a dense hot ICM extending out to several core radii rchas been provided by the discovery and the interpretation of “...
Introduction Dwarf Galaxies: General Properties Main Components of the Interstellar Medium Star Formation and Active Nuclei Star Forming Dwarfs in the Local Universe Star Forming Dwarfs in the Cosmological Persepctive Future Prospects Author Contributions Funding Institutional Review Board Statement Informed Co...
lens is only strong enough to slightly stretch the background object; this is known as weak lensing. By studying the statistical properties of the shapes of very distant galaxies and quasars, astronomers can use the effects of weak lensing to study the distribution ofdark matterin theuniverse....
Introduction This page illuminates the catalog of 338 peculiar galaxy views gathered by Dr. Halton C. Arp in hisAtlas of Peculiar Galaxies. TheAtlasis a selection of unusual or peculiar galaxies, interacting pairs or larger groups. As amateur telescopes grow in capability and CCD cameras are beco...
An Introduction to Particle Dark Matter Stefano ProfumoLeonardo GianiOliver F. Piattella Universe Oct 2019 We review the features of Dark Matter as a particle, presenting some old and new instructive models, and looking for their physical implications in the early universe and in the process of ...
1. INTRODUCTION Perhaps the biggest puzzle of galaxy formation in recent decades has been the early and rapid forma- tion of the most massive galaxies (Bender et al. 1998; Cimatti et al. 2004). This apparently supported the “monolithic collapse” model (Eggen et al. 1962), in con- ...