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Filtering by Tag: Epoch of Reionisation

"Dark-ages Reionization and Galaxy Formation Simulation - XV. Stellar evolution and feedback in dwarf galaxies at high redshift" - Qin et al. (2019)

Alan Duffy

This is the last paper from the thesis of my amazing PhD student (now Dr!) Yuxiang Qin, which was published in the Monthly Notices of the Royal Astronomical Society, and explored the modifications to semi-analytic models that best describe the nature and impact of star formation and stellar feedback (i.e. when stars explode!) on the early galaxies. He created an entire new paradigm, with accompanying model/code, that others can incorporate into their own simulated universes. The preprint version of the paper is available freely.

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"Dark-ages reionization and galaxy formation simulation XII: Bubbles at dawn" - Geil et al. (2017)

Alan Duffy

One of my favourite human beings, colleagues and collaborators - Dr Paul Geil - also came up with one of my favourite paper titles of all time. The work using DRAGONS focusses on the structure of the Epoch of Reionisation. In the first billion years after the Big Bang growing galaxies shone with ionising UV light, lighting up the Universe itself. This light ionised the hydrogen gas lying around the galaxies, creating cavities or bubbles in the intergalactic medium. the exact structure of the bubbles, how many of a given size and their rate of growth, is intimately tied to the nature of dark matter and the physics of galaxy formation. Paul predicted how new telescopes like the Square Kilometre Array can explore these bubbles, and exactly how awesome they will be at constraining all sorts of physics. A huge piece of work that will be years in the testing, so forward looking is its predictions.

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