Results 21 to 30 of about 36,246 (179)

Galaxy Formation Theory [PDF]

open access: yes, 2010
We review the current theory of how galaxies form within the cosmological framework provided by the cold dark matter paradigm for structure formation. Beginning with the pre-galactic evolution of baryonic material we describe the analytical and numerical
Abadi   +563 more
core   +1 more source

Alfvén waves in space and astrophysical dusty plasmas [PDF]

open access: yesNonlinear Processes in Geophysics, 2014
In this paper, we present some results of previous works on Alfvén waves in a dusty plasma in different astrophysical and space regions by taking into account the effect of superthermal particles on the dispersive characteristics.
V. Jatenco-Pereira   +2 more
doaj   +1 more source

A simple model for molecular hydrogen chemistry coupled to radiation hydrodynamics [PDF]

open access: yes, 2018
We introduce non-equilibrium molecular hydrogen chemistry into the radiation hydrodynamics code Ramses-RT. This is an adaptive mesh refinement grid code with radiation hydrodynamics that couples the thermal chemistry of hydrogen and helium to moment ...
Nickerson, Sarah   +2 more
core   +3 more sources

Cosmic Dust Aggregation with Stochastic Charging

open access: yes, 2013
The coagulation of cosmic dust grains is a fundamental process which takes place in astrophysical environments, such as presolar nebulae and circumstellar and protoplanetary disks.
Hyde, Truell W.   +2 more
core   +1 more source

Dust Coagulation Reconciles Protoplanetary Disk Observations with the Vertical Shear Instability. I. Dust Coagulation and the VSI Dead Zone

open access: yesThe Astrophysical Journal, 2023
Protoplanetary disks exhibit a vertical gradient in angular momentum, rendering them susceptible to the vertical shear instability (VSI). The most important condition for the onset of this mechanism is a short timescale of thermal relaxation (≲0.1 ...
Thomas Pfeil   +2 more
doaj   +1 more source

Effect of dust on Kelvin-Helmholtz instabilities

open access: yes, 2014
Dust is present in a large variety of astrophysical fluids, from tori around supermassive black holes to molecular clouds, protoplanetary discs, and cometary outflows.
Hendrix, Tom, Keppens, Rony
core   +1 more source

Mixing in the Solar Nebula: Implications for Isotopic Heterogeneity and Large-Scale Transport of Refractory Grains [PDF]

open access: yes, 2008
The discovery of refractory grains amongst the particles collected from Comet 81P/Wild 2 by the Stardust spacecraft (Brownlee et al. 2006) provides the ground truth for large-scale transport of materials formed in high temperature regions close to the ...
Alan P. Boss   +41 more
core   +1 more source

The first frost in the Pipe Nebula [PDF]

open access: yes, 2017
Spectroscopic studies of ices in nearby star-forming regions indicate that ice mantles form on dust grains in two distinct steps, starting with polar ice formation (H2O rich) and switching to apolar ice (CO rich).
Bailey, J. D.   +6 more
core   +3 more sources

Production, Transport, and Destruction of Dust in the Kuiper Belt: The Effects of Refractory and Volatile Grain Compositions

open access: yesThe Astrophysical Journal Letters
The Venetia Burney Student Dust Counter (SDC) on board the New Horizons spacecraft measures the spatial and size distributions of dust along its trajectory.
Thomas Corbett   +11 more
doaj   +1 more source

Multiphase Gas Nature in the Sub-parsec Region of the Active Galactic Nuclei. I. Dynamical Structures of Dusty and Dust-free Outflow

open access: yesThe Astrophysical Journal, 2023
We investigated dusty and dust-free gas dynamics for a radiation-driven sub-parsec-scale outflow in an active galactic nucleus (AGN) associated with a supermassive black hole 10 ^7 M _⊙ and bolometric luminosity 10 ^44 erg s ^−1 based on the two ...
Yuki Kudoh   +3 more
doaj   +1 more source

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