The Origin of Ultra Diffuse Galaxies: Challenging the Galaxy Formation Paradigm - Jean Brodie
The Origin of Ultra Diffuse Galaxies: Challenging the Galaxy Formation Paradigm - Jean Brodie (Swinburne)
I will discuss observational results on the origin of Ultra Diffuse Galaxies (UDGs) and their globular cluster systems along with current thinking on their formation pathways. UDGs have the sizes of giant galaxies (greater than 1.5 Kpc) but the luminosities of dwarfs.
I will review the evidence that the universe has created three types of UDG. One type has properties consistent with regular dwarf galaxies that have been puffed-up and made “ultra diffuse” by reasonably well-understood processes. A second type has characteristics (in particular rich globular cluster systems, often associated with massive dark matter halos) that are not reproduced by simulations. These UDGs appear to have formed some stars and many star clusters at an early epoch but, by some as yet unknown mechanism, they ceased subsequent star formation. This type of UDG has been dubbed “Failed Giant”. The third type, dark matter (DM) deficient, lies at the other extreme of the ratio of dark to normal matter for galaxies hosting populous star cluster systems. Recent work may be able to explain the “DM free” UDGs.
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