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64 papers · 2 filters
Cannonballs in the context of Gamma Ray Bursts: Formation sites ?
Jan E. Staff, Christian Fendt, Rachid Ouyed
We investigate possible formation sites of the cannonballs (in the gamma ray bursts context) by calculating their physical parameters, such as density, magnetic field and temperatu…
Dynamical HII Region Evolution in Turbulent Molecular Clouds
Garrelt Mellema, S. Jane Arthur, William J. Henney +2
We present numerical radiation-hydrodynamic simulations of the evolution of HII regions formed in an inhomogeneous medium resulting from turbulence simulations. We find that the fi…
The 21 Centimeter Background from the Cosmic Dark Ages: Minihalos and the Intergalactic Medium before Reionization
Paul R. Shapiro, Kyungjin Ahn, Marcelo A. Alvarez +3
The H atoms inside minihalos (i.e. halos with virial temperatures T_vir < 10^4 K, in the mass range roughly from 10^4 M_sun to 10^8 M_sun) during the cosmic dark ages in a LambdaCD…
Effects of Gravitational Lensing and Companion Motion on the Binary Pulsar Timing
Roman R. Rafikov, Dong Lai
The measurement of the Shapiro time delay in binary pulsar systems with highly inclined orbit can be affected both by the motion of the pulsar's companion because of the finite tim…
Simulating Cosmic Reionization at Large Scales I: the Geometry of Reionization
Ilian T. Iliev, Garrelt Mellema, Ue-Li Pen +3
We present the first large-scale radiative transfer simulations of cosmic reionization, in a simulation volume of (100/h Mpc)^3, while at the same time capturing the dwarf galaxies…
The Cosmic Reionization History as Revealed by the CMB Doppler--21-cm Correlation
Marcelo A. Alvarez, Eiichiro Komatsu, Olivier Doré +1
We show that the epoch(s) of reionization when the ionization fraction of the universe is about half can be determined by correlating Cosmic Microwave Background (CMB) temperature…