Paramita Barai -- Visualization

Isolated Milky-Way like Disk Galaxy undergoing AGN Feedback

The movies and images below show projections of hydrodynamical properties of gas in simulation runs investigating different AGN feedback. The galaxy-gas evolution movie can be seen by clicking on the image or the words "Density/Temperature". The "Temperature" (T) movie actually shows the specific internal energy (Uspec), where, T = Uspec * (gamma - 1) * MeanWeight / k_B. The image is the end or an intermediate state of the gas for the duration in each movie. The simulations use a Hubble parameter of h = 0.72. The length scale is depicted by the 2 white circles with the radius written beside, whose unit is (1/h) kpc. The times written at the top-left are in units of 1.36 Gyr.

The initial condition is a disk galaxy of total mass 1.09e+12 Msun, having the following components: dark matter halo of mass 1.04e+12 Msun represented by 300000 collisionless particles, gas disk of mass 3.68e+09 Msun represented by 50000 SPH particles, stellar disk of mass 3.31e+10 Msun represented by 25000 collisionless particles, and stellar bulge of mass 9.20e+09 Msun represented by 25000 collisionless particles. It is same as the MW isolated galaxy in Murante, G. et al. (2010, MNRAS, 405, 1491). A Black Hole of mass written in the run description below is created at time = 0, at the location of the gas particle with maximum density. The galaxy is then allowed to evolve, with the BH accreting gas and its feedback being coupled as - either thermal or kinetic energy.

The images and movie frames have been generated using Gadget File Viewer.

Runs with no limit on Hole Creation around BH (by swallowing gas inside h_sml)

• Run01-NoFeedback-alpha100 Sanity Check

  Case without any BH feedback, only with gas accretion onto BH according to the Bondi rate multiplied by factor alpha. BH grows in mass uninterruptedly, depleting gas from the whole galaxy. No well-defined outflow is created, few particles flow out (leave the disk) at later times.

  Face-On View, [X - Y] plane

  Density Temperature

  Edge-On View, [Y - Z] plane

  Temperature

• Run04-Kin-Enrg-epsF_0.01 Sanity Check

  Kinetic feedback from BH, Energy-driven Wind prescription, eps_f = 0.01. Wind particles always coupled to hydrodynamical interactions. Intermittent bipolar jet-like outflows created, when a large number of gas particles flow out. Small hole forms at galaxy center by depletion of gas.

  Temperature :

  Face-On Edge-On

• Run09-a100-Thermal-e0.01

  Thermal feedback from BH, eps_f = 0.01. Some particles flow out, & some of them fall back creating Galactic Fountain. BH does not grow as much as kinetic case.

  Face-On Edge-On

FINAL Runs (those used in paper) with limit on Hole Creation around BH

• Run21-NoBH-ForComparison : No BH. Only radiative cooling, star-formation, stellar evolution and chemical enrichment. Note a difference in the plotted color scale of Log(Internal Energy) between this case and the other runs shown in this page. This non-BH simulation demonstrates unambiguously that a prominent gas outflow develops, starting from time = 1.74 plotted units, via thermal SNIa feedback in the stellar evolution model. This SNIa-driven outflow is present in all the runs below (on top of BH-driven outflows), making it harder to disentangle the cause in those cases.

  Temperature

  
  MAKE DENSITY-SMOOTHED-PLOT OF Run21-NoBH-ForComparison, Run15-IC_vel300-Thermal-e0.01, Run16-IC_vel300-KinM-v2.5k-e1.0

• Run01-KinEnrg-v5k-e0.01 : Kinetic feedback from BH, Energy-driven Wind prescription, v_w = 5,000 km/s, eps_f = 0.01.

  Temperature

• Run02-KinEnrg-v5k-e0.05 : Kinetic feedback from BH, Energy-driven Wind prescription, v_w = 5,000 km/s, eps_f = 0.05.

  Temperature

• Run03-KinEnrg-v5k-e0.25 : Kinetic feedback from BH, Energy-driven Wind prescription, v_w = 5,000 km/s, eps_f = 0.25.

  Temperature

• Run04-KinEnrg-v10k-e0.01 : Kinetic feedback from BH, Energy-driven Wind prescription, v_w = 10,000 km/s, eps_f = 0.01.

  Temperature

• Run05-KinEnrg-v10k-e0.05 : Kinetic feedback from BH, Energy-driven Wind prescription, v_w = 10,000 km/s, eps_f = 0.05.

  Temperature

• Run06-KinEnrg-v10k-e0.25 : Kinetic feedback from BH, Energy-driven Wind prescription, v_w = 10,000 km/s, eps_f = 0.25.

  Temperature

• Run07-Thermal-e0.01 : Thermal feedback from BH, eps_f = 0.01.

  Temperature

• Run08-Thermal-e0.05 : Thermal feedback from BH, eps_f = 0.05.

  Temperature

• Run09-Thermal-e0.002 : Thermal feedback from BH, eps_f = 0.002.

  Temperature

• Run10-KinMom-v5k-e0.25 : Kinetic feedback from BH, Momentum-driven Wind prescription, v_w = 5,000 km/s, eps_f = 0.25.

  Temperature

• Run11-KinMom-v5k-e1.0 : Kinetic feedback from BH, Momentum-driven Wind prescription, v_w = 5,000 km/s, eps_f = 1.0.

  Temperature

• Run12-KinMom-v2.5k-e1.0 : Kinetic feedback from BH, Momentum-driven Wind prescription, v_w = 2,500 km/s, eps_f = 1.0.

  Temperature

  
  
  
  

  Higher-Mass Galaxy (IC_vel300)

• Run13-IC_vel300-KinE-v5k-e0.05 : Kinetic feedback from BH, Energy-driven Wind prescription, v_w = 5,000 km/s, eps_f = 0.05.

  Temperature

• Run14-IC_vel300-KinE-v10k-e0.25 : Kinetic feedback from BH, Energy-driven Wind prescription, v_w = 10,000 km/s, eps_f = 0.25.

  Temperature

• Run15-IC_vel300-Thermal-e0.01 : Thermal feedback from BH, eps_f = 0.01.

  Temperature

• Run16-IC_vel300-KinM-v2.5k-e1.0 : Kinetic feedback from BH, Momentum-driven Wind prescription, v_w = 2,500 km/s, eps_f = 1.0.

  Temperature

  
  
  
  

  Lower-Mass Galaxy (IC_vel75)

• Run17-IC_vel75-KinE-v5k-e0.05 : Kinetic feedback from BH, Energy-driven Wind prescription, v_w = 5,000 km/s, eps_f = 0.05.

  Temperature

• Run18-IC_vel75-KinE-v10k-e0.25 : Kinetic feedback from BH, Energy-driven Wind prescription, v_w = 10,000 km/s, eps_f = 0.25.

  Temperature

• Run19-IC_vel75-Thermal-e0.01 : Thermal feedback from BH, eps_f = 0.01.

  Temperature

• Run20-IC_vel75-KinM-v2.5k-e1.0 : Kinetic feedback from BH, Momentum-driven Wind prescription, v_w = 2,500 km/s, eps_f = 1.0.

  Temperature

BACK to Main Page