Mass-to-light ratio gradients in early-type galaxy haloes
... have, in the near future, a much better observational picture of the halo mass distributions in a large representative sample of early-type galaxies. To prepare for this observational onslaught, in this paper we want to provide a suite of predictions from the CDM theory for halo mass distributions. ...
... have, in the near future, a much better observational picture of the halo mass distributions in a large representative sample of early-type galaxies. To prepare for this observational onslaught, in this paper we want to provide a suite of predictions from the CDM theory for halo mass distributions. ...
Part2
... Often, especially when mapping, you are in the intermediate regime: Many GMCs per beam, but not a sizable piece of the galaxy. Relevant quantity here is H2 surface density or CO surface brightness. We’ve talk about how we might estimate the CO luminosity of a galaxy, but how is this luminosity distr ...
... Often, especially when mapping, you are in the intermediate regime: Many GMCs per beam, but not a sizable piece of the galaxy. Relevant quantity here is H2 surface density or CO surface brightness. We’ve talk about how we might estimate the CO luminosity of a galaxy, but how is this luminosity distr ...
has occurred over the past 14 billion years COSMIC DOWNSIZING
... AMY J. BARGER studies the evolution of the universe by observing some of its oldest objects. She is an associate professor of astronomy at the University of Wisconsin– Madison and also holds an affiliate graduate faculty appointment at the University of Hawaii at Manoa. Barger earned her Ph.D. in as ...
... AMY J. BARGER studies the evolution of the universe by observing some of its oldest objects. She is an associate professor of astronomy at the University of Wisconsin– Madison and also holds an affiliate graduate faculty appointment at the University of Hawaii at Manoa. Barger earned her Ph.D. in as ...
Master`s thesis: On the investigation of dark matter haloes
... which means it can be deflected by heavy objects. This was proven during a solar eclipse where a small deflection of a star near the solar disc was observed, thereby confirming general relativity. General relativity is the framework of modern cosmology and in general relativity the Universe can have ...
... which means it can be deflected by heavy objects. This was proven during a solar eclipse where a small deflection of a star near the solar disc was observed, thereby confirming general relativity. General relativity is the framework of modern cosmology and in general relativity the Universe can have ...
The evolution of dwarf galaxy satellites with different dark matter
... Therefore, in order to make progress beyond the idealized simulation we devise a numerical strategy that in the past has only been attempted for simulations of galaxies in clusters ( Dubinski (1999); Mastropietro et al. (2005)). In this approach, known as the ”replacement technique”, cosmological su ...
... Therefore, in order to make progress beyond the idealized simulation we devise a numerical strategy that in the past has only been attempted for simulations of galaxies in clusters ( Dubinski (1999); Mastropietro et al. (2005)). In this approach, known as the ”replacement technique”, cosmological su ...
Crash Galaxies
... some influence too, though minor compared with other factors. The dynamics of galaxy interplay are under close study by many workers, and over time all sorts of fascinating stories will undoubtedly emerge. Computer simulations have helped investigators understand better the remarkable dance steps th ...
... some influence too, though minor compared with other factors. The dynamics of galaxy interplay are under close study by many workers, and over time all sorts of fascinating stories will undoubtedly emerge. Computer simulations have helped investigators understand better the remarkable dance steps th ...
Dark matter
Dark matter is a hypothetical kind of matter that cannot be seen with telescopes but would account for most of the matter in the universe. The existence and properties of dark matter are inferred from its gravitational effects on visible matter, on radiation, and on the large-scale structure of the universe. Dark matter has not been detected directly, making it one of the greatest mysteries in modern astrophysics.Dark matter neither emits nor absorbs light or any other electromagnetic radiation at any significant level. According to the Planck mission team, and based on the standard model of cosmology, the total mass–energy of the known universe contains 4.9% ordinary matter, 26.8% dark matter and 68.3% dark energy. Thus, dark matter is estimated to constitute 84.5% of the total matter in the universe, while dark energy plus dark matter constitute 95.1% of the total mass–energy content of the universe.Astrophysicists hypothesized the existence of dark matter to account for discrepancies between the mass of large astronomical objects determined from their gravitational effects, and their mass as calculated from the observable matter (stars, gas, and dust) that they can be seen to contain. Their gravitational effects suggest that their masses are much greater than the observable matter survey suggests. Dark matter was postulated by Jan Oort in 1932, albeit based upon insufficient evidence, to account for the orbital velocities of stars in the Milky Way. In 1933, Fritz Zwicky was the first to use the virial theorem to infer the existence of unseen matter, which he referred to as dunkle Materie 'dark matter'. More robust evidence from galaxy rotation curves was discovered by Horace W. Babcock in 1939, but was not attributed to dark matter. The first hypothesis to postulate ""dark matter"" based upon robust evidence was formulated by Vera Rubin and Kent Ford in the 1960s–1970s, using galaxy rotation curves. Subsequently, many other observations have indicated the presence of dark matter in the universe, including gravitational lensing of background objects by galaxy clusters such as the Bullet Cluster, the temperature distribution of hot gas in galaxies and clusters of galaxies and, more recently, the pattern of anisotropies in the cosmic microwave background. According to consensus among cosmologists, dark matter is composed primarily of a not yet characterized type of subatomic particle.The search for this particle, by a variety of means, is one of the major efforts in particle physics today.Although the existence of dark matter is generally accepted by the mainstream scientific community, some alternative theories of gravity have been proposed, such as MOND and TeVeS, which try to account for the anomalous observations without requiring additional matter. However, these theories cannot account for the properties of galaxy clusters.