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Estimating the bispectrum of the Very Small Array data

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 352:3 (2004) 887-902

Authors:

S Smith, G Rocha, A Challinor, RA Battye, P Carreira, K Cleary, RD Davies, RJ Davis, C Dickinson, R Genova-Santos, K Grainge, CM Gutiérrez, YA Hafez, MP Hobson, ME Jones, R Kneissl, K Lancaster, A Lasenby, JP Leahy, K Maisinger, GG Pooley, N Rajguru, R Rebolo, JA Rubiño-Martin, PS Molina, RDE Saunders, RS Savage, P Scott, A Slosar, AC Taylor, D Titterington, E Waldram, RA Watson

Gemini imaging of QSO host galaxies at z ∼ 2

ASTROPHYSICAL JOURNAL 606:1 (2004) 126-138

Authors:

SM Croom, D Schade, BJ Boyle, T Shanks, L Miller, RJ Smith

HI in the protocluster environment at z > 2:: absorbing haloes and the Lyα forest

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 351:3 (2004) 1109-1119

Authors:

RJ Wilman, MJ Jarvis, HJA Rottgering, L Binette

Magnetic Flux Transport in the ISM through Turbulent Ambipolar Diffusion

Chapter in Magnetic Fields and Star Formation, Springer Nature (2004) 45-51

Authors:

Fabian Heitsch, Ellen G Zweibel, Adrianne D Slyz, Julien EG Devriendt

Magnetic flux transport in the ISM through turbulent ambipolar diffusion

ASTROPHYS SPACE SCI 292:1-4 (2004) 45-51

Authors:

F Heitsch, EG Zweibel, Adrianne, D Slyz, JEG Devriendt

Abstract:

Under ideal MHD conditions the magnetic field strength should be correlated with density in the interstellar medium ( ISM). However, observations indicate that this correlation is weaker than expected. Ambipolar diffusion can decrease the flux-to-mass ratio in weakly ionized media; however, it is generally thought to be too slow to play a significant role in the ISM except in the densest molecular clouds. Turbulence is often invoked in other astrophysical problems to increase transport rates above the ( very slow) diffusive values. Building on analytical studies, we test with numerical models whether turbulence can enhance the ambipolar diffusion rate sufficiently to explain the observed weak correlations. The numerical method is based on a gas-kinetic scheme with very low numerical diffusivity, thus allowing us to separate numerical and physical diffusion effects.