Speaker: Cliff Johnson

The Panchromatic Hubble Andromeda Treasury (PHAT) is a Hubble Space Telescope multi-cycle survey program that has imaged one-third of the Andromeda Galaxy.  These observations provide wavelength coverage from the ultraviolet to the near-infrared, allowing detailed studies of stellar populations using resolved photometry of 117 million stars.
Hubble’s high spatial resolution imaging has allowed us to identify thousands of previously unknown star clusters in M31.  A catalog of >2700 clusters was assembled using image classifications collected through the Andromeda Project citizen science website.  This catalog represents a factor of 6 increase in the number of clusters identified within the PHAT survey footprint, made possible by 30,000 volunteers and their 1.8 million image classifications.
The PHAT dataset provides a unique opportunity to explore star formation in a large disk galaxy across a range of environments.  I will discuss my efforts to explore the environmental dependencies of star cluster formation and how these constraint inform studies of star formation and the evolution of stellar structures in the galaxy disk.