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  1. No Access

    Chapter

    Spectral Modeling in Astrophysics—The Physics of Non-equilibrium Clouds

    Collisional-radiative spectral modeling plays a central role in astrophysics, probing phenomena ranging from the chemical evolution of the Universe to the energy production near supermassive black holes in dis...

    G. J. Ferland, R. J. R. Williams in Modern Methods in Collisional-Radiative Mo… (2016)

  2. No Access

    Chapter and Conference Paper

    Laboratory experiments to study supersonic astrophysical flows interacting with clumpy environments

    A wide variety of objects in the universe drive supersonic outflows through the interstellar medium which is often highly clumpy. These inhomogeneities affect the morphology of the shocks that are generated. T...

    P. A. Rosen, J. M. Foster, B. H. Wilde… in High Energy Density Laboratory Astrophysic… (2010)

  3. No Access

    Chapter and Conference Paper

    Photoionized Flows from Magnetized Globules

    Low mass star formation may be triggered by the dynamical effects of radiation fields and winds from massive stars on nearby molecular material. The columns of neutral material observed at the edges of many HI...

    R. J. R. Williams in High Energy Density Laboratory Astrophysics (2007)

  4. No Access

    Chapter

    MHD Ionization Fronts

    The structure and evolution of Hii regions has been described by Will Henney in this volume. Young massive stars emit copious fluxes of ultraviolet radiation, forming regions of almost entirely ionized gas in ...

    R.J.R. Williams in Diffuse Matter from Star Forming Regions to Active Galaxies (2007)

  5. No Access

    Chapter and Conference Paper

    Numerical Simulations and Astrophysical Applications of Laboratory Jets at Omega

    We have conducted experiments on the Omega laser at the University of Rochester that have produced jets of supersonic Ti impacting and being deflected by a ball of high density plastic. These mm-sized jets of ...

    R. F. Coker, B. H. Wilde, J. M. Foster… in High Energy Density Laboratory Astrophysics (2007)

  6. No Access

    Chapter

    Shock Propagation Through Multiphase Media

    This paper presents two and three dimensional simulations of the interaction of shocks with media with large numbers of dense inclusions. An approximate model of the interaction of a starburst wind with the su...

    R.J.R. Williams, D.L. Youngs in High Energy Density Laboratory Astrophysics (2005)

  7. No Access

    Chapter

    Recent Experimental Results and Modelling of High-Mach-Number Jets and the Transition to Turbulence

    In recent years, we have carried out experiments at the University of Rochester’s Omega laser in which supersonic, dense-plasma jets are formed by the interaction of strong shocks in a complex target assembly ...

    P.A. Rosen, B.H. Wilde, R.J.R. Williams… in High Energy Density Laboratory Astrophysics (2005)

  8. No Access

    Chapter

    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...

    J. E. Dyson, R. J. R. Williams, J. J. Perry in Astrophysical and Laboratory Plasmas (1996)

  9. No Access

    Chapter and Conference Paper

    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 ultracompact Hii regions (UCHiiR) may result from the interaction of a young early type star and this typ...

    M. P. Redman, R. J. R. Williams, J. E. Dyson in Shocks in Astrophysics (1995)

  10. No Access

    Chapter and Conference Paper

    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...

    J. E. Dyson, R. J. R. Williams, J. J. Perry in Shocks in Astrophysics (1995)