Paramita Barai -- Visualization

SPH Simulations of Black Hole Accretion: Radiative Feedback and Instability-driven Multiphase Gas Motion

(Reference Papers: P. Barai, D. Proga & K. Nagamine 2011, MNRAS, 418, 591; and
P. Barai, D. Proga & K. Nagamine 2012, MNRAS, 424, 728.)

Cross-sections of hydrodynamical properties of gas in different simulation runs. The image in the first (left) panel shows the initial state and the next (right) panel shows the final state of the gas, for the duration shown in each movie. The evolution in between can be seen as a movie by clicking on the links at the top. The run numbers written on this page correspond to the simulation numbers of the reference papers. Please note that this number might be different from the run number noted at the top of the image / movie. The unit of the x- and y- axes is pc. The images and movie frames have been generated using SPLASH.

Bondi Accretion

• Run04, Density MOVIE. The initial condition is noisy, and the gas becomes more and more spherically-symmetric with time.
  

  

Gas Accretion with Radiative Heating & Cooling: Spherical Flow to Cold Clumps & Hot Bubbles

• Run23 : LxByLedd_5e-4

  • Whole 200 pc volume

    • Temperature MOVIE
      

      

    • Density MOVIE
      

      

  • Inner 1.5 pc. The heating inside ~ 0.5 pc is due to Artificial Viscosity in SPH code, a numerical artifact.

    • Temperature MOVIE
      

      

  ---

• Run26 : LxByLedd_1e-2

  • Whole 200 pc volume

    • Temperature MOVIE
      

      

  • Inner 40 pc

    • Temperature MOVIE
      

      

    • Density MOVIE
      

      

  • Inner 12 pc --- Slower movies.

    • MOVIE of Density and Temperature together.
      

      

    • MOVIE of Density and Pressure together --- Clumps and filaments in density-plane, more spherical-symmetry in pressure-plane.
      

      

  • Inner 4 pc --- Slower movies showing the accretion of gas onto < 1 pc.

    • Temperature MOVIE --- Colder clumps get heated up (by adiabatic and/or radiative heating) before falling in to the center.
      

      

    • Density MOVIE --- Clumps remain denser while falling in.
      

      

    • MOVIE of Density and Temperature together --- Denser clumps getting heated up as they fall in.
      

      

  ---

• Run27 : LxByLedd_2e-2

  • Whole 200 pc volume

    • Temperature MOVIE
      

      

    • Density MOVIE
      

      

  • Inner 60 pc

    • Temperature MOVIE
      

      

    • Density MOVIE
      

      

  ---

• Run28, whole 200 pc volume : LxByLedd_5e-2

  • Temperature MOVIE
    

    

  • Density MOVIE
    

    

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