Dr Becky Smethurst

Dr Becky Smethurst recognised by RAS

Astronomy and astrophysics

Dr Becky Smethurst has been awarded the Royal Astronomical Society’s 2022 Winton Award for Astronomy.

Dr Smethurst has made major advances in the field of galaxy formation and evolution: her key discovery was to overturn the long-established view that galaxy mergers are the main process in driving galaxy evolution along with the formation and evolution of supermassive black holes. She undertook a statistical sample of quenching activity in a large population of galaxies that contained active galactic nuclei (and hence growing supermassive black holes) and found that quenching activity was prevalent in low-mass, isolated disk galaxies, which are not expected to be the products of mergers. Further study of the supermassive black holes in these galaxies showed that they were 100 times more massive than predicted by classical arguments. This critically shows that non-merger processes are sufficient to grow supermassive black holes and furthermore these can drive active galactic nuclei outflows.

Dr Smethurst’s observations from the Keck facility showed that the outflows have extremely large velocities, far greater than the escape velocity, thereby providing a disturbing force to the ISM and in so doing disrupting and quenching star formation. This has led to the understanding that the majority of supermassive black hole growth in the Universe is due to merger-free activity and this has now been incorporated in cosmological simulations.

‘I am delighted that my research efforts have been recognised by the Royal Astronomical Society,’ comments Dr Smethurst. ‘I am really passionate about my work on growing supermassive black holes and I can’t wait to see what the future brings.’

‘Becky is an inspirational scientist and she plays a key role in the Department of Physics here at Oxford,’ adds Professor Ian Shipsey, Head of Department. ‘Congratulations on this richly deserved recognition.’