Accretion instabilities driving violent outcome of a merging binary, and its observable signatures.
The authors of today’s paper created simulated galaxies, for which true properties are known. They then used synthetic observations to compare the true answers to the values observers would expect to recover.
Star formation and supernova explosions play an important role in galaxy formation and evolution, in a process known as feedback. Today’s astrobite discusses how modifying the amount of feedback from supernova explosions affects the properties of the disc of a Milky Way galaxy, and how it affects the hot, gaseous halo surrounding massive galaxies.
Supermassive black holes (SMBH) likely exist at the center of every massive galaxy in our universe. How these million to billion solar mass beasts form is not well understood. The authors in today’s astrobite examine the possibility of the direct collapse of massive gas clouds to form SMBH seeds in a computer simulation of a galaxy merger.
In this short critical essay, a computational astrophysicist, Kevin Heng, questions the movement of his field toward more complex models producing larger volumes of data. Toward the end of his essay, Heng poses some open questions to the simulation community. “Is scientific truth more robustly represented by the simplest, or the most complex model?”, and, “How may we judge when a simulation has successfully approximated reality in some way?”
High resolution computational simulations are a valuable means by which Astronomers test our understanding of the Universe, and make predictions. The world of computational astrophysics broke new ground recently with the highest resolution cosmological simulation to date, Illustris, making for some spectacular science and some spectacular images.