Speaker
Description
Andromeda (And) XIX is a unique dwarf galaxy in the M31 system. Its large half-light radius (in excess of 3 kpc) and low surface brightness (29.3 magnitudes per square arcsecond) make it one of the most diffuse galaxies in the known Universe. In addition to its extreme structural properties, its dynamics also suggest that it sits in a low density dark matter halo that may have been shaped by tidal forces. To understand how such a galaxy could form, we acquired deep HST imaging to resolve stars in this system down to its oldest main sequence turn-off. These allow us to measure a detailed star formation history for And XIX for the first time. In this talk, I will present our findings from these data in concert with chemodynamical observations. These will allow me to confront various theories for the formation of And XIX and discuss how such galaxies may form.
| Do you plan to attend the symposium in-person or virtually? | in-person |
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