Simulations reveal how stellar and black hole feedback shape galaxy growth
In short: Researchers using the EAGLE project conducted 13 cosmological simulations to understand how different physical processes influence the formation of galaxies. By varying various models of energy feedback, they discovered that while star formation activity primarily dictates the properties of smaller galaxies, the growth of more massive galaxies is driven by energy released from central black holes.
The study highlights a critical challenge in computational astronomy: simply matching the total number of galaxies of a certain mass is not enough to create a realistic universe. The team found that simulations must also account for specific energy injection methods to produce galaxies with the correct physical sizes.
The researchers tested different subgrid models to see how they affected galaxy evolution. A major limitation of these simulations is the reliance on numerical models to approximate complex physical processes like radiative losses in dense gas.
Why it matters: Understanding how galaxies grow requires balancing the energy output from both stars and central black holes.
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Sources
- Summary by Intellect · source: Research: Crain et al. (2015). The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations. Monthly Notices of the Royal Astronomical Society.
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