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Article
The turbulent destruction of interstellar clouds
The interaction of an astrophysical shock with a cloud typically occurs at high Reynolds number, and in such cases will be highly turbulent. However, the formation of fully developed turbulence is usually prev...
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Article
Cautionary Tails
We briefly discuss the observational evidence for linear features in diffuse astronomical sources. We then discuss their formation either by radiation shadowing or by hydrodynamic processes.
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Article
Self-Similar Evolution of Remnants With Conductively Driven Mass-Loading
We present self-similar solutions for remnants that are mass-loaded by conductively driven evaporation. This work extends the earlier results of Chièze and Lazareff through the inclusion of the explicit depend...
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Article
The Fine Structures of Planetary Nebulae
Most theoretical studies of the dynamics of planetary nebulae assume that the slow ejecta from the red-giant or asymptotic giant branch phase of evolution of the central star is distributed smoothly. We consid...
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Article
Truncated Collimated Flows in Abell 30, Abell 78 and the Honeycomb Nebula
Localised collimated flows of ionized gas are found in two hydrogen deficient planetary nebulae, Abell 30 and Abell 78 as well as in the Honeycomb complex of interlocking shells in halo of 30 Dor in the Large ...
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Article
Structure and Stability of Ionization Fronts
The study of the dynamics of ionization fronts has moved far since Franz Kahn helped define the field in the 1950s. Nevertheless, the stability of the fronts and the nature of elephant trunks and bright rims i...
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Article
Some Recent Results on MHD Shocks and Winds
Work on the rotation of the magnetic field around the shock propagation direction in an oblique shock in a dusty medium is reviewed. A significant observational consequence is that the rotation lowers the mini...
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Article
The Tails of Externally Illuminated Young Stellar Objects in the Orion Nebula
Recent observations of externally illuminated young stellar objects in the Orion Nebula show that they have a variety of morphologies. In particular, long thin tails which terminate in points have been observe...
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Introduction
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Article
Flows in clumpy planetary nebulae
The dynamics of clumps observed in planetary nebulae are considered. The possibility that SiO maser spots in evolved stars and the planetary nebula clumps are formed by the Parker instability behind shocks in ...
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Article
Line forming regions in active galaxies and their nuclei
The spectra of active galaxies and their nuclei are rich in emission and absorption line features. A major aim of present research is the development of self-consistent hydrodynamic models for the production o...
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Article
Wide intermediate scale structures in mass-loaded flows
We showed in earlier work that a clump embedded in tenuous plasma, which is flowing subsonically relative to the clump, will develop a long thin tail whether the gas in the tail behaves adiabatically or isothe...
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Article
All's knot quiet on the recombination front
Molecular clouds are clumpy on length scales down to the limits of observational resolution. At least some ultracompactHii regions (UCHiiR) may result from the interaction of a young early type star and this type...
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Article
Flows and shocks in active galaxies and their nuclei
Observations of active galactic nuclei imply that shocks must be an essential and important part of their structure. We outline the basic observations, and discuss those features which must be addressed by any...
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Article
An evolutionary model for the wolf rayet nebula NGC 2539
The main outer ring of the WR nebula NGC 2539 expands radially with velocity ≈ 26kms−1. The dynamics are modelled as the interaction of the winds from the O progenitor and the present WR stage with clumpy molecul...
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Article
Highly supersonic molecular flows in wind-clump boundary layers
The gradual acceleration, through viscous coupling to a wind, of molecular hydrogen in turbulent boundary layers around obstacle clumps is proposed to be responsible for the widths of the emission features wit...
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Editorial note
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Book reviews
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Mass pick-up in astronomical flows
Many astrophysical sources are clumpy. The flows in the diffuse media in these sources are affected by the mass picked up through the ablation of the embedded clumps. The diffuse media-clump interfaces can be ...
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Book reviews