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Filtering by Tag: Students

"Model Dispersion with prism: An Alternative to MCMC for Rapid Analysis of Models" - vd Velden (2019)

Alan Duffy

Published in the highly ranked ApJS and JOSS (as well as being available on arXiv for free) the “Probabilistic Regression Instrument for Simulating Models” package PRISM was a massive undertaking by my PhD student Ellert vd Velden. He built a brand-new open source MPI-capable Python package that can take ANY model from a user and map out the entire parameter space for regions that can explain the data.

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"The impact of feedback and the hot halo on the rates of gas accretion on to galaxies" - Correa et al. (2018)

Alan Duffy

My former student, and now high flying postdoctoral researcher at Leiden University, Dr Camila Correa answered one of the basic questions in galaxy formation in this paper - how does gas get to the galaxy from the larger Universe? The simple answer is, it depends. Essentially the bigger you are the more gas you can pull in, until you get to something the size of our Milky Way, when the `accretion'  rate of material infalling then flattens out. This picture is complicated as the hot gas halo surrounding a galaxy is responsible for preventing new material from infalling as it shocks against the hot halo. The amount of the hot halo depends on the type of energetic events within a galaxy, be it exploding stars (supernovae) or accreting black holes (AGN). A beautiful bit of work that will inform theorists and observers for years to come!

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"Dark-ages reionization and galaxy formation simulation XIII: AGN quenching of high-redshift star formation in ZF-COSMOS-20115" - Qin et al. (2017)

Alan Duffy

A lovely piece of work by my student Yuxiang Qin, and amazingly rapid turn around of a paper using the DRAGONS series of supercomputer models. The newly discovered galaxy ZF-Cosmos-20115 had some remarkably strange properties that at first glance seemed to bend the laws of galaxy formation to be so large so soon after the Big Bang. This work instead revealed that the rapid stellar mass gain, and the resulting quiescence thereafter, can be naturally explained by significant mergers of smaller objects that created the large stellar nucleus - but this large central bulge itself then inhibited future star formation. This was then tracked back in time in the DRAGONS universe to reveal that the rapidly growing black holes of the earlier universe could indeed by housed in what then becomes these strange quiescent galaxies at later times.

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