Results 1 to 10 of about 129,006 (100)
A ring-like accretion structure in M87 connecting its black hole and jet [PDF]
Nature, 2023 The nearby radio galaxy M87 is a prime target for studying black hole accretion and jet formation^ 1 , 2 . Event Horizon Telescope observations of M87 in 2017, at a wavelength of 1.3 mm, revealed a ring-like structure, which was interpreted as ...
R. Lu +120 more
semanticscholar +1 more source
A pebble accretion model for the formation of the terrestrial planets in the Solar System [PDF]
Science Advances, 2021 A new theory for formation of Earth by accretion of small pebbles explains how our planet acquired its water and carbon. Pebbles of millimeter sizes are abundant in protoplanetary discs around young stars. Chondrules inside primitive meteorites—formed by
A. Johansen +6 more
semanticscholar +1 more source
Ab Initio Horizon-scale Simulations of Magnetically Arrested Accretion in Sagittarius A* Fed by Stellar Winds [PDF]
Astrophysical Journal, 2020 We present 3D general relativistic magnetohydrodynamic (GRMHD) simulations of the accretion flow surrounding Sagittarius A* that are initialized using larger-scale MHD simulations of the ∼30 Wolf–Rayet (WR) stellar winds in the Galactic center.
S. Ressler +3 more
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Formation of planetary systems by pebble accretion and migration [PDF]
Astronomy & Astrophysics, 2018 At least 30% of main sequence stars host planets with sizes of between 1 and 4 Earth radii and orbital periods of less than 100 days. We use N-body simulations including a model for gas-assisted pebble accretion and disk–planet tidal interaction to study
B. Bitsch +6 more
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Hot Accretion Flows Around Black Holes [PDF]
, 2014 Black hole accretion flows can be divided into two broad classes: cold and hot. Whereas cold accretion flows consist of cool optically thick gas and are found at relatively high mass accretion rates, hot accretion flows, the topic of this review, are ...
F. Yuan, R. Narayan
semanticscholar +1 more source
Tectonic models for accretion of the Central Asian Orogenic Belt
Journal of the Geological Society, 2007 The Central Asian Orogenic Belt (c. 1000–250 Ma) formed by accretion of island arcs, ophiolites, oceanic islands, seamounts, accretionary wedges, oceanic plateaux and microcontinents in a manner comparable with that of circum-Pacific Mesozoic–Cenozoic ...
B. Windley +4 more
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Advection-dominated Accretion: A Self-similar Solution [PDF]
, 1994 We consider viscous rotating accretion flows in which most of the viscously dissipated energy is stored as entropy rather than being radiated. Such advection-dominated flows may occur when the optical depth is either very small or very large. We obtain a
R. Narayan, I. Yi
semanticscholar +1 more source
Accretion Dynamics on Wet Granular Materials. [PDF]
Physical Review Letters, 2017 Wet granular aggregates are common precursors of construction materials, food, and health care products. The physical mechanisms involved in the mixing of dry grains with a wet substrate are not well understood and difficult to control.
G. Saingier, A. Sauret, P. Jop
semanticscholar +1 more source
Global Radiation Magnetohydrodynamic Simulations of sub-Eddington Accretion Disks around Supermassive Black Holes [PDF]
Astrophysical Journal, 2019 We conduct global three-dimensional radiation magnetohydrodynamic simulations of the inner regions of accretion flows around a 5 × 108M⊙ black hole, with mass accretion rates reaching 7% and 20% of the Eddington value.
Yan-Fei 飞姜 Jiang 燕 +3 more
semanticscholar +1 more source
Global long-term observations of coastal erosion and accretion
Scientific Reports, 2018 Changes in coastal morphology have broad consequences for the sustainability of coastal communities, structures and ecosystems. Although coasts are monitored locally in many places, understanding long-term changes at a global scale remains a challenge ...
L. Mentaschi +4 more
semanticscholar +1 more source