A rotation around the still 3D frame of a Coma-sized cluster of galaxies (1e15 solar masses), displaying the distribution of baryonic matter.
the most discontinuous parts of the image and sharp edges nicely show where shocks are present at this particular epoch.
Interesting to say how different the very same cluster looks if imaged along different lines of sight.
Today, a nice commentary on @wired.it of my article on the simulation hypothesis, in italian:
https://www.wired.it/article/non-viviamo-simulazione-dimostrazione/
So, I guess, I should just relax and wait for next tidal waves of mails from crackpots, or directly haters, since I have discovered that taking this stand (against the simulation hypothesis) has produced DOZENS of hated commentaries on some facebook pages.
🙄
I know, it was my choice since the beginning...
#Julia rendering by former PhD student M. Angelinelli of the formation and evolution of a simulated cluster of galaxies in a non-radiative ENZO grid simulation, over about 13 billion years of evolution.
The resolution of each cell is 30kpc, at all distances from the cluster centre, which we used to nicely resolve shocks and turbulence even where the cluster "ends".
Please enjoy diving and swimming into the 3-dimensional rendering of one of our largest simulations of the cosmic web, produced for a PRACE project using ENZO on the CURIE supercluster (France) in 2017. The volume is 200^3 Mpc^3 at redsfhit =0.
The quantity on display is the baryonic matter, which follows dark matter and traces the skeleton of the cosmic web.
Rendering by my colleague Claudio Gheller, using the Splotch code.
Spinning cube with a small-scale filtering estimate of the turbulent velocity field, representing the plasma in a cluster of galaxies.
Done with SAO's DS9 on my ENZO simulations.
Two views of the messy structure of gas velocity fields in realistic (? 🤞🏼 ) simulations of clusters of galaxies on large (>10kpc) scales.
The left panel show the amplitude of the full velocity field along the line of sight: red meaning the gas comes towards you, blue that it is receding. The scan goes from one side of the cluster towards the side next to the viewer.
In the second panel, motions ordered on scales >300kpc are filtered out.
Simulated emergence of diffuse radio emission at 150MHz from shocks and turbulent reacceleration (i.e. Fermi II) in a cluster of galaxies steadily growing mass from z=1.5 to z=0.
ENZO simulation and Julia post-processing for the Fokker-Planck evolution of relativistic electrons.
#SimulatedUniverses #science #astronomy #astrodon #juliacoding
Formation and evolution of a cluster of galaxies simulated with adaptive mesh refinement (with the ENZO code), for a total of about 10 billion years in this movie.
the left panel shows the projected baryon density while the right one the baryon temperature.
#SimulatedUniverses #astronomy #astrodon #science #physics
Same initial conditions, same ENZO code evolving a 150Mpc^3 portion of the Universe from z=50 to z=0.
However, the initial σ8 parameter, prescribing the amplitude of the initial matter perturbations within a 8Mpc/h scale, has been changed in regular steps from σ8=0.5 (very low) to σ8=1.0 (very high). "Reality" probably is between 0.8 and 0.7.
This the resulting baryon density distribution in al cases.
#SimulatedUniverses #MAKITRA #Astronomy #Astrodon #Science
Quick evolutionary sequence (from 1 to 13 Gyr of age) of a gas density in a cosmological simulation - part of a larger survey of variations of cosmological and magnetic parameters.
Below the evolution of other related quantities, to easily spot how different observable proxies of cosmic matter cluster in a different way along the cosmic volume.
#paperday Want to start the week with a fresh paper which clearly thinks outside of the box? 😅
Here you go
https://arxiv.org/abs/2504.08461
"Astrophysical constraints on the simulation hypothesis for this Universe: why it is (nearly) impossible that we live in a simulation"
Will do a paper explainer in the near future...
#astrodon #astronomy #science #physics #SimulatedUniverses #SimulationHypothesis
Nice rendering of the growing mass distribution in a simulated cluster of galaxies, and of the shocks driven by the same process, by former PhD student Matteo Angelinelli, using Julia over ENZO simulations.
Revolving around one axis of a 3D simulation of baryons in a massive cluster of galaxies (ENZO simulation, movie with SAO's DS9).
VIsualisation of the central turmoil of gas temperature, around a simulated Active Galactic Nuclei in a Persus-like cluster of galaxies.
Simulations by PhD student Stefano Sotira using ENZO
Backwards structure formation is cool too
#SimulatedUniverses #astronomy #astrodon #science
I got reminded at a talk at a recent conference that I produced this nice RGB rendering of two alternative scenarios for the generation of magnetic fields in the Universe - I entirely forgot about it, the papers was about Fast Radio Burst (https://arxiv.org/pdf/1805.11113, not really my thing) so it went forgotten...why not resurrect it.
Evolution of a simulated small group of galaxies, with several key quantities integrated along the line of sight on display.
Prepared for a lecture but nice to show.
Some movie of the evolution of cosmic ray electrons released into the cosmic web by different simulated processes (all in the same run, but tracked with different fluid species).
1) relativistic electrons injected by shocks, via diffusive shock acceleration.
#SimulatedUniverses #astronomy #astrodon #science
For the curious, the related very recent paper is here:
https://ui.adsabs.harvard.edu/abs/2025arXiv250119041V/abstract
Turmoiling evolution of the magnetic fields expelled by galaxies into the network of the cosmic web, in a small cosmological simulations with ENZO and animated gif assembled with SAO's DS9.
