How to weigh a galaxy - backwards in time
The Astrophysics research group’s Professor Justin Read establishes new method for weighing dwarf galaxies backwards in time.
In a study published in Nature Communications, Dr Ugur Ural (Potsdam) and Prof. Justin Read (University of Surrey), with collaborators from Leicester and Carnegie Mellon, have developed a new technique for weighing tiny “dwarf” galaxies both today and, for the first time, backwards in time. We have applied the method to the `Carina' dwarf spheroidal, finding that it is surprisingly light and always was.
Such a low mass suggests that there must be a large population of ghostly massive dwarf galaxies, as massive as their visible counterparts, orbiting the Milky Way.