Angular Momentum of Dark Matter Black Holes
... , ρ2 = r 2 + α2 cos2 θ and ∆ = r 2 − 2Mr + α2 , (t, r, θ, φ) coordinates, after defining α = M ...
... , ρ2 = r 2 + α2 cos2 θ and ∆ = r 2 − 2Mr + α2 , (t, r, θ, φ) coordinates, after defining α = M ...
Dark Stars: Dark Matter annihilation can power the first stars
... • But, triaxial haloes have all kinds of orbits (box orbits, chaotic orbits) so that much more dark matter is in there. Dark stars can grow much bigger and make supermassive stars, 105-107 M¤, last much longer, and reach 109-1011 L¤. Some may live to today • Visible in James Webb Space Telescope ...
... • But, triaxial haloes have all kinds of orbits (box orbits, chaotic orbits) so that much more dark matter is in there. Dark stars can grow much bigger and make supermassive stars, 105-107 M¤, last much longer, and reach 109-1011 L¤. Some may live to today • Visible in James Webb Space Telescope ...
Galaxy map hints at fractal universe
... to such huge scales undermines the standard model of cosmology. According to the accepted story of cosmic evolution, there simply hasn't been enough time since the big bang nearly 14 billion years ago for gravity to build up such large structures. What's more, the assumption that the distribution is ...
... to such huge scales undermines the standard model of cosmology. According to the accepted story of cosmic evolution, there simply hasn't been enough time since the big bang nearly 14 billion years ago for gravity to build up such large structures. What's more, the assumption that the distribution is ...
pdf format
... We see that v is approximately constant in galaxies (does not depend on a). Therefore the Mass inside radius a increases linearly with a. ...
... We see that v is approximately constant in galaxies (does not depend on a). Therefore the Mass inside radius a increases linearly with a. ...
PC2491 Examples 2
... of the Sun and (r) is the angular velocity at radius r. An H1 cloud in the galactic plane at l=30o is observed to have a velocity relative to the local standard of rest of +80 km s-1. Assume the galactic rotation curve is flat with an amplitude of 220 km s-1 , and that Ro = 8.2 kpc and estimate the ...
... of the Sun and (r) is the angular velocity at radius r. An H1 cloud in the galactic plane at l=30o is observed to have a velocity relative to the local standard of rest of +80 km s-1. Assume the galactic rotation curve is flat with an amplitude of 220 km s-1 , and that Ro = 8.2 kpc and estimate the ...
Hubblecast72: ESO 137
... extended fog can be seen enveloping the galaxy and streaming off into space. These X-ray tails are formed from the cool gas stripped from ESO 137-001, which has since been heated to many millions of degrees Celsius by the hot gas in the cluster. ...
... extended fog can be seen enveloping the galaxy and streaming off into space. These X-ray tails are formed from the cool gas stripped from ESO 137-001, which has since been heated to many millions of degrees Celsius by the hot gas in the cluster. ...
WIMPs and MACHOs - Caltech Astronomy
... couplings, so the distinction is especially important for dark matter detection efforts. For example, the WIMP class of particles can be defined as those particles that are created thermally, while dark matter axions come mostly from non-thermal processes. Light neutrinos are also thermally created ...
... couplings, so the distinction is especially important for dark matter detection efforts. For example, the WIMP class of particles can be defined as those particles that are created thermally, while dark matter axions come mostly from non-thermal processes. Light neutrinos are also thermally created ...
TNFL03 - fallstudier inom flygtrafik och logistik Homework Set 1
... go until it expands to fill with today’s stars and galaxies, and what you find is that it contains amounts of that particle that are just right to be ’dark matter’ filling the universe.” Terrific, you might say, but what’s so wonderful about dark matter? Dark matter is basically a bunch of stuff, li ...
... go until it expands to fill with today’s stars and galaxies, and what you find is that it contains amounts of that particle that are just right to be ’dark matter’ filling the universe.” Terrific, you might say, but what’s so wonderful about dark matter? Dark matter is basically a bunch of stuff, li ...
Post-class version
... Clusters of galaxies are the largest gravitationally bound structures. They are grouped into superclusters. Superclusters line up in filaments, which are separated by empty spaces or voids. ...
... Clusters of galaxies are the largest gravitationally bound structures. They are grouped into superclusters. Superclusters line up in filaments, which are separated by empty spaces or voids. ...
g 2 - Desy
... MUED: g1 is a dark matter candidate KK level 2 bosons are like Z’ bosons Further studies are needed (resolution power …) Sensitivity of ILC for level 2 KK bosons: ~2√s ILC has a good chance for detection LHC: sensitivity up to 1/R~1.5 TeV ...
... MUED: g1 is a dark matter candidate KK level 2 bosons are like Z’ bosons Further studies are needed (resolution power …) Sensitivity of ILC for level 2 KK bosons: ~2√s ILC has a good chance for detection LHC: sensitivity up to 1/R~1.5 TeV ...
Astronomy 100—Exam 3
... C. In an open star cluster. 24. Astronomers believe a massive black hole exists in the nucleus of the Galaxy. The evidence they provide: A. large amount of X-ray is observed from the nucleus B. if there were not a black hole there, all stars in the Galaxy would just drift into space. C. motions of s ...
... C. In an open star cluster. 24. Astronomers believe a massive black hole exists in the nucleus of the Galaxy. The evidence they provide: A. large amount of X-ray is observed from the nucleus B. if there were not a black hole there, all stars in the Galaxy would just drift into space. C. motions of s ...
The Milky Way, Schroedinger`s Cat, and You
... The Hubble Space Telescope is in orbit above the Earth’s atmosphere and so is able to take sharp pictures……but….. ….. it is prohibitively expensive to build telescopes that are based in space A new method called “Adaptive Optics” allows us to sharpen the vision of telescopes that are on the ground, ...
... The Hubble Space Telescope is in orbit above the Earth’s atmosphere and so is able to take sharp pictures……but….. ….. it is prohibitively expensive to build telescopes that are based in space A new method called “Adaptive Optics” allows us to sharpen the vision of telescopes that are on the ground, ...
An additional term of the Galactic tide due to dark matter
... z̃-term is weaker in 2 kpc (Brasser et al. 2010, Fig. 4), therefore the new term is clearly dominant here. The total amplitude of the tide is larger in 2 kpc than in 8 kpc, just because of the new term. Although the intrinsic nature of the dark matter is unknown, its gravitational effect has been wel ...
... z̃-term is weaker in 2 kpc (Brasser et al. 2010, Fig. 4), therefore the new term is clearly dominant here. The total amplitude of the tide is larger in 2 kpc than in 8 kpc, just because of the new term. Although the intrinsic nature of the dark matter is unknown, its gravitational effect has been wel ...
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.