Results 51 to 60 of about 8,399 (150)

Hypervelocity Stars from the Andromeda Galaxy

, 2008
Hypervelocity stars (HVSs) discovered in the Milky Way (MW) halo are thought to be ejected from near the massive black hole (MBH) at the galactic centre.
Abraham Loeb, Binney J., Blake D. Sherwin, Frank J., Ginsburg I., Gualandris A., Kippenhahn R., Lu Y., Lynden-Bell D., O'Leary R. M., Perryman M. A. C., Press W. H., Ryan M. O'Leary, Sawa T., Schaller G., Seigar M. S., van der Marel R. P.   +16 more
core   +2 more sources

Cluster Accretion Shocks as Possible Acceleration Sites for Ultra High Energy Protons below the Greisen Cutoff [PDF]

, 1995
Three-dimensional hydrodynamic simulations of large scale structure in the Universe have shown that accretion shocks form during the gravitational collapse of one-dimensional caustics, and that clusters of galaxies formed at intersections of the caustics
Jones, T. W., Kang, Hyesung, Ryu, Dongsu
core   +2 more sources

Field resonance propulsion concept [PDF]

A propulsion concept was developed based on a proposed resonance between coherent, pulsed electromagnetic wave forms, and gravitational wave forms (or space-time metrics).
Holt, A. C.
core   +1 more source

The Baryonic Fraction in Groups of Galaxies from X-Ray Measurements

, 1993
The recent {\sl ROSAT \/} X-ray detections of hot intergalactic gas in three groups of galaxies are reviewed and the resulting baryonic fraction in these groups is reevaluated. We show that the baryonic fraction obtained, assuming hydrostatic equilibrium,
Henriksen, Mark J., Mamon, Gary A.
core   +1 more source

Relating the Interpolated Motion of Robots to Quantum Gravity and Intergalactic Travel

, 2019
Interpolation is making the end of a robot arm move smoothly from one pose (position and orientation) to another ie programming it to move smoothly from A to B through a series of intermediate points. Linear interpolation does the job very nicely, but has the drawback that the motion is not totally smooth because of the accelerations. Point A initially
openaire   +1 more source

Modernity and mimetic desire: A critique of René Girard

Constellations, Volume 31, Issue 1, Page 18-31, March 2024.
Amnon Lev
wiley   +1 more source

Cosmogenic neutrinos and ultra-high energy cosmic ray models

, 2015
We use an updated version of {\it SimProp}, a Monte Carlo simulation scheme for the propagation of ultra-high energy cosmic rays, to compute cosmogenic neutrino fluxes expected on Earth in various scenarios.
Aloisio, R., Boncioli, D., di Matteo, A, Grillo, A. F., Petrera, S., Salamida, F.   +5 more
core   +3 more sources

Gamma-ray bursts as X-ray depth-gauges of the Universe

, 2003
We discuss the X-ray flux of gamma-ray burst afterglows at redshifts in the range 3-30, including the effects of the intergalactic He II absorption. We point out that strong X-ray lines may form locally in burst afterglows starting minutes after the ...
Meszaros, P., Rees, M. J.
core   +1 more source

A Size of ~10 Mpc for the Ionized Bubbles at the End of Cosmic Reionization

, 2004
The first galaxies to appear in the universe at redshifts z>20 created ionized bubbles in the intergalactic medium of neutral hydrogen left over from the Big-Bang.
Abraham Loeb, DN Spergel, J Miralda-Escude, J. Stuart B. Wyithe, JE Gunn, JR Bond, JSB Wyithe, L Pentericci, N Yoshida, NY Gnedin, R Barkana, R Barkana, RL White, V Bromm, X Fan   +14 more
core   +1 more source

"Fermi" bubbles are bursting from our galaxy. Their origins remain a mystery. [PDF]

Proc Natl Acad Sci U S A, 2023
Mann A.
europepmc   +1 more source