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sliderarxiv [2016/07/13 08:08]
jr0018
sliderarxiv [2017/05/05 11:48] (current)
jr0018
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 ====== News ArXive ====== ====== News ArXive ======
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 +<slider :​104637_galaxy_formation_small.png>​
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 +**Understanding "​dynamical friction"​**
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 +//
 +"​Dynamical friction"​ is a phenomenon first theorised by Chandrasekhar in the 1930'​s. It is a gravitational drag force that is likely responsible for galaxy-galaxy mergers, star cluster mergers, and even the merger of binary "​super-massive"​ black holes. Yet despite its long history, it still throws us some surprises. A decade ago now, it was noticed that the frictional force appears to disappear in galaxies that have a constant density. Our PhD student James Petts has finally shown why this happens and developed a new model to explain the behaviour: [[http://​arxiv.org/​abs/​1607.04284]].
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 +<slider :​dwarf_gas_faceon.png>​
 +**A new test of the standard cosmological model at the edge of galaxy formation**
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 +Surrey astrophysicists Prof. Justin Read and Dr. Oscar Agertz, along with collaborators at the University of Bologne, have developed a new test of our standard cosmological model. By fitting the rotational velocities of nearby "​dwarf"​ galaxies, they were able to weigh these tiny galaxies accurately, for the first time. They find that their masses are perfectly consistent with the standard cosmological model, suggesting that dark matter is a cold, collisionless particle. [[http://​arxiv.org/​abs/​1607.03127v1]].
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 +<slider :​gieles_zocchi.png>​
 +**New models for globular clusters**
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 +Surrey astrophysicists Prof. Mark Gieles and Dr. Alice Zocchi developed a new family of models that can be used to infer detailed properties of globular clusters from observational data: [[http://​arxiv.org/​abs/​1508.02120]]. ​
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 +<slider :​liang_etal.png>​
 +**Gas around galaxies** ​
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 +In a study by Cameron J. Liang (University of Chicago), Andrey V. Kravtsov (University of Chicago) and Oscar Agertz (University of Surrey), we use cosmological zoom-in simulations to investigate the origin of observed multi-phase gas around galaxies. [[http://​arxiv.org/​abs/​1507.07002]].
 +//
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 <slider :​dwarf_gas_faceon.png>​ <slider :​dwarf_gas_faceon.png>​